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UBC expert helps B.C. prepare for an earthquake

October 15 is officially ShakeOut BC Day, and more than 750,000 British Columbians are expected to participate in this year’s drill. In this Q&A, UBC earthquake safety expert Carlos Ventura talks about the nature of earthquakes and what’s being done to ensure that the buildings where we live, study and work are earthquake-ready.

There’s a lot of talk about B.C. being overdue for the Big One: an earthquake of 9.0 magnitude or greater. Is the province ready for a major quake?

It’s important to understand that it’s not only the magnitude of the earthquake that determines its impact. Smaller earthquakes, if they occur near urban areas, can cause significant damage.

That said, the province is more prepared for an earthquake in the sense that government, scientists, educators, and the news media have been actively spreading safety awareness.

Everyone should know the drill by heart: drop, cover and hold on. Recognize quickly that it is an earthquake and don’t panic. Hide under a sturdy table or desk, or crouch near an inside corner of the building. Stay there until the shaking stops. Many earthquake-related injuries in North America are due to falling objects, not buildings collapsing. Once the shaking has stopped, leave your house or building if you can do so safely, and grab your emergency kit if you have one.

How important are emergency kits? What’s in yours?

Because an earthquake can affect a wide region, you could lose power, water, heat and food for a period of time. An emergency kit will help you stay warm and treat minor injuries.

My survival kit at home and in the office contains water, dried food, a blanket, a hand radio, and some simple medical supplies. Some people think of their camping gear as a survival kit.

There’s concern that not all B.C. schools are earthquake-ready.

Vancouver has made great strides, but for a number of reasons, a significant number of school buildings in the city are still in the high-risk category. However, many school districts outside Vancouver have done or are completing their seismic upgrades. Earthquake shelters have also been identified in many schools, such as gyms or other large spaces that are designed to perform very well and stay operational during an earthquake.

For new buildings, seismic readiness is not as big an issue because they are designed to comply with building standards, which specify the amount of shaking that a building must be able to withstand. But most of the older buildings, especially those built before the 1970s, need to be retrofitted to become compliant.

You say it’s impossible to accurately predict when an earthquake will happen. Does B.C. have an early warning system at least?

Yes. At the Earthquake Engineering Research Facility at UBC, we’re working on an early warning system consisting of sensors installed at many different locations to detect and measure the different waves generated by an earthquake: the P (primary) waves, the S (secondary) waves and the surface waves, which are more damaging.

Depending on the waves’ characteristics, the system will generate an alarm, and people will have a few seconds or almost a minute to take shelter, depending on their distance from the epicentre of the earthquake. A few seconds’ warning could be enough to save your life.

This early warning system was tested in a pilot project with Vancouver’s Catholic schools and is currently being rolled out across the Lower Mainland. Eventually we hope to add Vancouver Island into this warning system as well.

We’re also working with the Ministry of Transportation and Infrastructure to install sensors near highways and other public structures. The more sensors there are, the more warning we’ll get and the safer we’ll be. Imagine being able to shut down trains quickly during an earthquake, postpone surgery, or stop machinery. An early warning system will allow us to do that and minimize damage.

UBC, the City of Vancouver, and the Vancouver Public Library are holding Earthquake Day on October 15 to raise earthquake awareness. This community outreach event complements ShakeOut BC Day and is one of UBC’s many Centennial initiatives.

Source: http://news.ubc.ca/2015/10/14/ubc-expert-helps-b-c-prepare-for-an-earthquake/

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Moderate earthquake off west coast of B.C.

Magnitude 5.7 earthquake 208 kilometres west of Port Hardy was lightly felt.

A 5.7 magnitude earthquake was detected Thursday at 6:48 a.m. PT, 208 kilometres west of Port Hardy, B.C., in the Pacific Ocean.

There is no tsunami threat, nor was there any damage, although there were reports the quake was “lightly felt” in Port Hardy.

Seismologist Alison Bird said the earthquake took place in an active area, but is not significant.

Earthquakes that register between 5 and 5.9 in magnitude are classified as moderate.

Source: http://www.cbc.ca/news/canada/british-columbia/moderate-earthquake-off-west-coast-of-b-c-1.3241719

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Vancouver earthquake scenario predicts up to 10,000 casualties

Vancouver earthquake scenario predicts up to 10,000 casualties

Minister of emergency preparedness says people are not prepared, as evidenced by recent windstorm.

Roughly 10,000 people in the Lower Mainland might die if a shallow earthquake struck directly beneath the city of Vancouver — that’s the projection from a worst-case scenario in the provincial government’s Earthquake Immediate Response Plan.

That number — combined with the recent windstorm in Southern B.C. — has the minister responsible for emergency preparedness in B.C. concerned that many are not prepared for the possibility of a large earthquake.

The scenario, laid out in a report released at the end of June, describes the event occurring on an ordinary January day, following a few days of continuous heavy rain that has caused some flooding.

The downtown cores of the region’s cities are full, and many parents and caregivers are on the road after having picked up children from school early to avoid traffic delays in the wet weather.

Then suddenly, a rumbling sound like a freight train is heard, followed by 10 to 20 seconds of violent shaking.

The scenario goes on to describe roads cracking, buildings collapsing, and fires starting through damaged electrical power and gas lines.

Impact on Victoria modeled

Two separate earthquakes, both shallow, were modeled for the report.

For the Greater Vancouver region, the earthquake was based on the largest historical earthquake in the region, a magnitude 7.3 earthquake which took place on Vancouver island in 1946.

In the second scenario a magnitude 7.0 earthquake was modeled for the Greater Victoria region, based on an existing fault that has not been active in the last 10,000 years.

“Both of these separate events have the potential to occur, although the probability is low,” the report said.

“These represent the worst-case scenarios for an earthquake affecting B.C. due to injuries, damage, and greatest economic impact.”

The anticipated effects include 52 injuries per 1,000 people in the Greater Victoria area (or Capital Regional District) and Metro Vancouver, and 4 casualties per 1,000 people.

The report goes on to detail how the province would work with various jurisdictions to coordinate an emergency response plan.

Minister is worried

Naomi Yamamoto, B.C.’s minister of state responsible for emergency preparedness, said these are “huge numbers.”

“I’m quite concerned that most people aren’t prepared, as evidenced by the recent windstorm [in southwestern B.C.]”

Yamamoto said the province will increase efforts to make British Columbians more aware of earthquake preparedness.

She said the province will continue to spend money to seismically upgrade schools, hospitals and other buildings, as well as roads and bridges.

In March 2015 it was reported that a deadline announced a decade ago to upgrade all the province’s schools by 2020 was pushed back between five and 10 years for various districts.

When asked if this new scenario would motivate the government to speed up that time frame, the Yamamoto replied that a number of projects require seismic upgrading.

“We never know when an earthquake will occur,” she said.

“It could be in the middle of the night, it could be on a weekend, it could be tomorrow. So schools are important, but so is the importance of seismically upgrading our highway systems and bridges. We also need to make sure that emergency vehicles can actually get to hospitals.”

Numbers are not surprising

Carlos Ventura, the director of the earthquake engineering research facility at the University of B.C., said other studies have previously showed that this extent of damage is possible.

“This is what you might expect for a region with a population that we have here,” he said.

“So the numbers are not unrealistic. They are scary numbers, but it’s good to know what could happen it we don’t take steps to protect ourselves and minimize the potential damage from an earthquake.”

Ventura said a major concern for the region is the number of older brick buildings, which are more likely to collapse in a severe earthquake, as well as buildings built in the 1960s or 1970s with concrete that doesn’t meet today’s standards.

The report forecasts that 12 per cent of buildings in Metro Vancouver region are most likely to receive complete damage, compared to 11 per cent in the Greater Victoria area.

However, he added that many buildings in the region have been designed to withstand earthquakes — and instead the threat of injury could come from falling or flying objects inside the building.

“The major problem we have is to fix the interior of buildings, to prevent those kinds of injuries to people,” he said.

Yamamoto said that the recent windstorm in B.C. has highlighted the importance of people being able to access information during an emergency, and being prepared.

“We need to make sure that people have emergency kits on hand. We need to make sure that the kits provide enough water for at least three days, food for thee days, batteries, and hand-powered, hand-cranked flashlights.”

Source: http://www.cbc.ca/news/canada/british-columbia/vancouver-earthquake-scenario-predicts-up-to-10-000-casualties-1.3213680

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Fraser Valley shaken by second earthquake this week

Mission’s 2.6 magnitude quake early Saturday morning comes after Abbotsford area hit.

A small earthquake shook the Fraser Valley early this morning just after 4:30 a.m. PT.

It measured a magnitude of 2.6 and was centred east of Mission, according to the U.S. Geological Survey.

This is the second quake this week, following a 2.4 magnitude one that registered near Abbotsford on Thursday, August 27.

Source: http://www.cbc.ca/news/canada/british-columbia/fraser-valley-shaken-by-second-earthquake-this-week-1.3208598

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Fracking-induced earthquakes could leave workers vulnerable, says geophysicist

Seismic scientist David Eaton says Canada’s fracking-induced quakes are the biggest in the world.

A leading seismic scientist says B.C.’s energy infrastructure and gasfield workers may be vulnerable to earthquakes caused by fracking.

Earthquakes triggered by fracking have been felt in Fort Nelson and Fort St. John, but University of Calgary geophysicist David Eaton says the shaking is strongest in remote areas near fracking sites.

“Certainly in the immediate area where there’s infrastructure established by the oil and gas industry, including pipelines and well bore casings, then it’s something that really requires some careful analysis,” said Eaton.

Fracking, the common name for hydraulic fracturing, is the process of injecting water, sand and chemicals at high pressure deep underground to break rock and free gas.

New research shows fracking-induced quakes are shallow, so they trigger stronger ground motion and shaking — potentially damaging in places without much earthquake preparedness.

Eaton, part of a national research network looking into “induced seismicity” — earthquakes caused by fracking — in northern B.C. and Alberta, says energy regulators are taking the issue “very seriously.”

The quakes are hitting far from cities and towns, he said, but pipelines, gas wells and workers at fracking sites are all vulnerable.

“If people are being shaken up by ground motions, then it makes it a matter of public concern,” he said.

WorkSafeBC spokeswoman Trish Knight Chernecki said she’s not aware of any workplace injuries caused by seismic activity.

“Our officers in the northeast of B.C. continue to inspect oil and gas workplaces and hold employers accountable for the health and safety of their workers including maintaining the safety of industry infrastructure,” she said.

Fracking triggered 2014 quake

Eaton’s concerns come amid the news that fracking triggered a 4.4-magnitude earthquake in northeastern B.C. last year, one of world’s largest earthquakes ever linked to the controversial process.

The 4.4-magnitude quake was felt in Fort St. John and Fort Nelson in August 2014. It was preceded by a 3.8-magnitude earthquake in late July, also caused by fracking.

In January, Alberta’s energy regulator reported fracking likely caused a 4.4-magnitude earthquake in the northern town of Fox Creek.

Meanwhile, B.C.’s Oil and Gas Commission continues to investigate whether a 4.6-magnitude quake only three kilometres from a fracking site was triggered by hydraulic fracturing this month.

Why is Canada different?

Eaton said the fracking-related earthquakes seen in Canada are different from those felt in the U.S.. In the U.S., larger earthquakes have been triggered — but they’re due to disposal of fracking wastewater, not fracking itself.

“Of all the induced earthquakes that are directly related to hydraulic fracturing, the ones we’re seeing in Western Canada are certainly at the top,” said Eaton.

“Worldwide [these quakes are] the highest magnitude events that are attributed to hydraulic fracturing anywhere in the world.”

Research is ongoing into why such large quakes are being triggered in Canada by fracking alone.

“It’s much different in Western Canada than in Oklahoma and Kansas — why is it different? That’s the topic of intensive research. It’s too early to say right now.”

Source: http://www.cbc.ca/news/canada/british-columbia/fracking-induced-earthquakes-could-leave-workers-vulnerable-says-geophysicist-1.3205262

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The Really Big One

An earthquake will destroy a sizable portion of the coastal Northwest. The question is when.

When the 2011 earthquake and tsunami struck Tohoku, Japan, Chris Goldfinger was two hundred miles away, in the city of Kashiwa, at an international meeting on seismology. As the shaking started, everyone in the room began to laugh. Earthquakes are common in Japan—that one was the third of the week—and the participants were, after all, at a seismology conference. Then everyone in the room checked the time.

Seismologists know that how long an earthquake lasts is a decent proxy for its magnitude. The 1989 earthquake in Loma Prieta, California, which killed sixty-three people and caused six billion dollars’ worth of damage, lasted about fifteen seconds and had a magnitude of 6.9. A thirty-second earthquake generally has a magnitude in the mid-sevens. A minute-long quake is in the high sevens, a two-minute quake has entered the eights, and a three-minute quake is in the high eights. By four minutes, an earthquake has hit magnitude 9.0.

When Goldfinger looked at his watch, it was quarter to three. The conference was wrapping up for the day. He was thinking about sushi. The speaker at the lectern was wondering if he should carry on with his talk. The earthquake was not particularly strong. Then it ticked past the sixty-second mark, making it longer than the others that week. The shaking intensified. The seats in the conference room were small plastic desks with wheels. Goldfinger, who is tall and solidly built, thought, No way am I crouching under one of those for cover. At a minute and a half, everyone in the room got up and went outside.

It was March. There was a chill in the air, and snow flurries, but no snow on the ground. Nor, from the feel of it, was there ground on the ground. The earth snapped and popped and rippled. It was, Goldfinger thought, like driving through rocky terrain in a vehicle with no shocks, if both the vehicle and the terrain were also on a raft in high seas. The quake passed the two-minute mark. The trees, still hung with the previous autumn’s dead leaves, were making a strange rattling sound. The flagpole atop the building he and his colleagues had just vacated was whipping through an arc of forty degrees. The building itself was base-isolated, a seismic-safety technology in which the body of a structure rests on movable bearings rather than directly on its foundation. Goldfinger lurched over to take a look. The base was lurching, too, back and forth a foot at a time, digging a trench in the yard. He thought better of it, and lurched away. His watch swept past the three-minute mark and kept going.

Oh, shit, Goldfinger thought, although not in dread, at first: in amazement. For decades, seismologists had believed that Japan could not experience an earthquake stronger than magnitude 8.4. In 2005, however, at a conference in Hokudan, a Japanese geologist named Yasutaka Ikeda had argued that the nation should expect a magnitude 9.0 in the near future—with catastrophic consequences, because Japan’s famous earthquake-and-tsunami preparedness, including the height of its sea walls, was based on incorrect science. The presentation was met with polite applause and thereafter largely ignored. Now, Goldfinger realized as the shaking hit the four-minute mark, the planet was proving the Japanese Cassandra right.

For a moment, that was pretty cool: a real-time revolution in earthquake science. Almost immediately, though, it became extremely uncool, because Goldfinger and every other seismologist standing outside in Kashiwa knew what was coming. One of them pulled out a cell phone and started streaming videos from the Japanese broadcasting station NHK, shot by helicopters that had flown out to sea soon after the shaking started. Thirty minutes after Goldfinger first stepped outside, he watched the tsunami roll in, in real time, on a two-inch screen.

In the end, the magnitude-9.0 Tohoku earthquake and subsequent tsunami killed more than eighteen thousand people, devastated northeast Japan, triggered the meltdown at the Fukushima power plant, and cost an estimated two hundred and twenty billion dollars. The shaking earlier in the week turned out to be the foreshocks of the largest earthquake in the nation’s recorded history. But for Chris Goldfinger, a paleoseismologist at Oregon State University and one of the world’s leading experts on a little-known fault line, the main quake was itself a kind of foreshock: a preview of another earthquake still to come.

Most people in the United States know just one fault line by name: the San Andreas, which runs nearly the length of California and is perpetually rumored to be on the verge of unleashing “the big one.” That rumor is misleading, no matter what the San Andreas ever does. Every fault line has an upper limit to its potency, determined by its length and width, and by how far it can slip. For the San Andreas, one of the most extensively studied and best understood fault lines in the world, that upper limit is roughly an 8.2—a powerful earthquake, but, because the Richter scale is logarithmic, only six per cent as strong as the 2011 event in Japan.

Just north of the San Andreas, however, lies another fault line. Known as the Cascadia subduction zone, it runs for seven hundred miles off the coast of the Pacific Northwest, beginning near Cape Mendocino, California, continuing along Oregon and Washington, and terminating around Vancouver Island, Canada. The “Cascadia” part of its name comes from the Cascade Range, a chain of volcanic mountains that follow the same course a hundred or so miles inland. The “subduction zone” part refers to a region of the planet where one tectonic plate is sliding underneath (subducting) another. Tectonic plates are those slabs of mantle and crust that, in their epochs-long drift, rearrange the earth’s continents and oceans. Most of the time, their movement is slow, harmless, and all but undetectable. Occasionally, at the borders where they meet, it is not.

Take your hands and hold them palms down, middle fingertips touching. Your right hand represents the North American tectonic plate, which bears on its back, among other things, our entire continent, from One World Trade Center to the Space Needle, in Seattle. Your left hand represents an oceanic plate called Juan de Fuca, ninety thousand square miles in size. The place where they meet is the Cascadia subduction zone. Now slide your left hand under your right one. That is what the Juan de Fuca plate is doing: slipping steadily beneath North America. When you try it, your right hand will slide up your left arm, as if you were pushing up your sleeve. That is what North America is not doing. It is stuck, wedged tight against the surface of the other plate.

Without moving your hands, curl your right knuckles up, so that they point toward the ceiling. Under pressure from Juan de Fuca, the stuck edge of North America is bulging upward and compressing eastward, at the rate of, respectively, three to four millimetres and thirty to forty millimetres a year. It can do so for quite some time, because, as continent stuff goes, it is young, made of rock that is still relatively elastic. (Rocks, like us, get stiffer as they age.) But it cannot do so indefinitely. There is a backstop—the craton, that ancient unbudgeable mass at the center of the continent—and, sooner or later, North America will rebound like a spring. If, on that occasion, only the southern part of the Cascadia subduction zone gives way—your first two fingers, say—the magnitude of the resulting quake will be somewhere between 8.0 and 8.6. That’s the big one. If the entire zone gives way at once, an event that seismologists call a full-margin rupture, the magnitude will be somewhere between 8.7 and 9.2. That’s the very big one.

Flick your right fingers outward, forcefully, so that your hand flattens back down again. When the next very big earthquake hits, the northwest edge of the continent, from California to Canada and the continental shelf to the Cascades, will drop by as much as six feet and rebound thirty to a hundred feet to the west—losing, within minutes, all the elevation and compression it has gained over centuries. Some of that shift will take place beneath the ocean, displacing a colossal quantity of seawater. (Watch what your fingertips do when you flatten your hand.) The water will surge upward into a huge hill, then promptly collapse. One side will rush west, toward Japan. The other side will rush east, in a seven-hundred-mile liquid wall that will reach the Northwest coast, on average, fifteen minutes after the earthquake begins. By the time the shaking has ceased and the tsunami has receded, the region will be unrecognizable. Kenneth Murphy, who directs FEMA’s Region X, the division responsible for Oregon, Washington, Idaho, and Alaska, says, “Our operating assumption is that everything west of Interstate 5 will be toast.”

In the Pacific Northwest, everything west of Interstate 5 covers some hundred and forty thousand square miles, including Seattle, Tacoma, Portland, Eugene, Salem (the capital city of Oregon), Olympia (the capital of Washington), and some seven million people. When the next full-margin rupture happens, that region will suffer the worst natural disaster in the history of North America. Roughly three thousand people died in San Francisco’s 1906 earthquake. Almost two thousand died in Hurricane Katrina. Almost three hundred died in Hurricane Sandy. FEMA projects that nearly thirteen thousand people will die in the Cascadia earthquake and tsunami. Another twenty-seven thousand will be injured, and the agency expects that it will need to provide shelter for a million displaced people, and food and water for another two and a half million. “This is one time that I’m hoping all the science is wrong, and it won’t happen for another thousand years,” Murphy says.

In fact, the science is robust, and one of the chief scientists behind it is Chris Goldfinger. Thanks to work done by him and his colleagues, we now know that the odds of the big Cascadia earthquake happening in the next fifty years are roughly one in three. The odds of the very big one are roughly one in ten. Even those numbers do not fully reflect the danger—or, more to the point, how unprepared the Pacific Northwest is to face it. The truly worrisome figures in this story are these: Thirty years ago, no one knew that the Cascadia subduction zone had ever produced a major earthquake. Forty-five years ago, no one even knew it existed.

In May of 1804, Meriwether Lewis and William Clark, together with their Corps of Discovery, set off from St. Louis on America’s first official cross-country expedition. Eighteen months later, they reached the Pacific Ocean and made camp near the present-day town of Astoria, Oregon. The United States was, at the time, twenty-nine years old. Canada was not yet a country. The continent’s far expanses were so unknown to its white explorers that Thomas Jefferson, who commissioned the journey, thought that the men would come across woolly mammoths. Native Americans had lived in the Northwest for millennia, but they had no written language, and the many things to which the arriving Europeans subjected them did not include seismological inquiries. The newcomers took the land they encountered at face value, and at face value it was a find: vast, cheap, temperate, fertile, and, to all appearances, remarkably benign.

A century and a half elapsed before anyone had any inkling that the Pacific Northwest was not a quiet place but a place in a long period of quiet. It took another fifty years to uncover and interpret the region’s seismic history. Geology, as even geologists will tell you, is not normally the sexiest of disciplines; it hunkers down with earthly stuff while the glory accrues to the human and the cosmic—to genetics, neuroscience, physics. But, sooner or later, every field has its field day, and the discovery of the Cascadia subduction zone stands as one of the greatest scientific detective stories of our time.

The first clue came from geography. Almost all of the world’s most powerful earthquakes occur in the Ring of Fire, the volcanically and seismically volatile swath of the Pacific that runs from New Zealand up through Indonesia and Japan, across the ocean to Alaska, and down the west coast of the Americas to Chile. Japan, 2011, magnitude 9.0; Indonesia, 2004, magnitude 9.1; Alaska, 1964, magnitude 9.2; Chile, 1960, magnitude 9.5—not until the late nineteen-sixties, with the rise of the theory of plate tectonics, could geologists explain this pattern. The Ring of Fire, it turns out, is really a ring of subduction zones. Nearly all the earthquakes in the region are caused by continental plates getting stuck on oceanic plates—as North America is stuck on Juan de Fuca—and then getting abruptly unstuck. And nearly all the volcanoes are caused by the oceanic plates sliding deep beneath the continental ones, eventually reaching temperatures and pressures so extreme that they melt the rock above them.

The Pacific Northwest sits squarely within the Ring of Fire. Off its coast, an oceanic plate is slipping beneath a continental one. Inland, the Cascade volcanoes mark the line where, far below, the Juan de Fuca plate is heating up and melting everything above it. In other words, the Cascadia subduction zone has, as Goldfinger put it, “all the right anatomical parts.” Yet not once in recorded history has it caused a major earthquake—or, for that matter, any quake to speak of. By contrast, other subduction zones produce major earthquakes occasionally and minor ones all the time: magnitude 5.0, magnitude 4.0, magnitude why are the neighbors moving their sofa at midnight. You can scarcely spend a week in Japan without feeling this sort of earthquake. You can spend a lifetime in many parts of the Northwest—several, in fact, if you had them to spend—and not feel so much as a quiver. The question facing geologists in the nineteen-seventies was whether the Cascadia subduction zone had ever broken its eerie silence…

Source: http://www.newyorker.com/magazine/2015/07/20/the-really-big-one

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Weather Underground – The arrival of man-made earthquakes.

In the fall of 2011, students in Katie Keranen’s seismology course at the University of Oklahoma buried portable seismograph stations around the campus, in anticipation of a football game between the Sooners and the Texas A. & M. Aggies. The plan was to see if the students could, by reading the instruments, detect the rumble of eighty-two thousand fans cheering for a touchdown. “To see if they can figure out if a signal is a passing train or a cheering crowd—that’s much more interesting for them than discussing data in theory,” Keranen, an assistant professor of geophysics, told me.

But at 2:12 A.M. on November 5th, the day of the game, people in seventeen states felt an earthquake of 4.8 magnitude, centered near Prague, Oklahoma, a town of roughly twenty-five hundred, which is about an hour’s drive from Norman, where O.U. is situated. The students quickly packed up the seismographs and headed to Prague, hoping to measure the aftershocks. “Obviously, this was more worthwhile than a game,” Keranen said.

Outside homes around Prague and nearby Meeker, Keranen and her students, along with Austin Holland, the head seismologist of the Oklahoma Geological Survey, buried their equipment. Portable seismographs look like mini-kegs, or time capsules, and they need to be placed underground and on a level. The researchers wanted to install them quickly, since the ground was still shaking.

Shortly before 11 P.M., people in Prague heard what sounded like a jet plane crashing. It was another earthquake, this time a 5.6, followed, two days later, by a 4.7. (The earthquake scale is logarithmic, so a 5.0 earthquake shakes the ground ten times more than a 4.0, and a hundred times more than a 3.0.) No one was killed, but at least sixteen houses were destroyed and a spire on the historic Benedictine Hall at St. Gregory’s University, in nearby Shawnee, collapsed. Very few people had earthquake insurance; the five million dollars needed for the repairs at St. Gregory’s was raised through crowdfunding.

The earthquakes were big news, but the victory of the Sooners—the name comes from the term for those who broke the rules of the 1889 land run and staked claims in advance—was followed more closely. Few noticed that Keranen and her team had gathered likely the best data we have on a new phenomenon in Oklahoma: man-made earthquakes.

At the time, earthquakes were a relatively rare event for Oklahomans. Now they’re reported on daily, like the weather, and generally by the weatherman. Driving outside Oklahoma City one evening last November, I ended up stopped in traffic next to an electronic billboard that displayed, in rotation, an advertisement for one per cent cash back at the Thunderbird Casino, an advertisement for a Cash N Gold pawnshop, a three-day weather forecast, and an announcement of a 3.0 earthquake, in Noble County. Driving by the next evening, I saw that the display was the same, except that the earthquake was a 3.4, near Pawnee.

Until 2008, Oklahoma experienced an average of one to two earthquakes of 3.0 magnitude or greater each year. (Magnitude-3.0 earthquakes tend to be felt, while smaller earthquakes may be noticed only by scientific equipment or by people close to the epicenter.) In 2009, there were twenty. The next year, there were forty-two. In 2014, there were five hundred and eighty-five, nearly triple the rate of California. Including smaller earthquakes in the count, there were more than five thousand. This year, there has been an average of two earthquakes a day of magnitude 3.0 or greater.

William Ellsworth, a research geologist at the United States Geological Survey, told me, “We can say with virtual certainty that the increased seismicity in Oklahoma has to do with recent changes in the way that oil and gas are being produced.” Many of the larger earthquakes are caused by disposal wells, where the billions of barrels of brackish water brought up by drilling for oil and gas are pumped back into the ground. (Hydraulic fracturing, or fracking—in which chemically treated water is injected into the earth to fracture rocks in order to access oil and gas reserves—causes smaller earthquakes, almost always less than 3.0.) Disposal wells trigger earthquakes when they are dug too deep, near or into basement rock, or when the wells impinge on a fault line. Ellsworth said, “Scientifically, it’s really quite clear.”

The first case of earthquakes caused by fluid injection came in the nineteen-sixties. Engineers at the Rocky Mountain Arsenal, a chemical-weapons manufacturing center near Commerce City, Colorado, disposed of waste fluids by injecting them down a twelve-thousand-foot well. More than a thousand earthquakes resulted, several of magnitudes close to 5.0. “Unintentionally, it was a great experiment,” Justin Rubinstein, who researches induced seismicity for the U.S.G.S., told me.

In recent years, other states with oil and gas exploration have also seen an unusual number of earthquakes. State authorities quickly suspected that the earthquakes were linked to disposal wells. In Youngstown, Ohio, in 2011, after dozens of smaller quakes culminated in a 4.0, a nearby disposal well was shut down, and the earthquakes stopped. Around the same time, in Arkansas, a series of earthquakes associated with four disposal wells in the Fayetteville Shale led to a ban on disposal wells near related faults. Earthquakes were also noted in Colorado, Kansas, and Texas. There, too, relevant disposal wells were shut down or the volume of fluid injected was reduced and the earthquakes abated…

Source: http://www.newyorker.com/magazine/2015/04/13/weather-underground

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Minor 2.9-magnitude earthquake felt in Abbotsford

Minor 2.9-magnitude earthquake felt in Abbotsford

Some Abbotsford, B.C., residents felt the ground shake early Sunday around 12:45 a.m.

The earthquake measured magnitude 2.9, and struck 7 kilometres east-southeast of Abbotsford, according to the U.S. Geological Survey (USGS).

The USGS reports that the epicentre was 10.9 kilometres underground.

The Abbotsford Fire Department confirmed no damage was reported, but many people took to social media claiming to have felt the earth beneath them shake.

Source: http://www.cbc.ca/news/canada/british-columbia/minor-2-9-magnitude-earthquake-felt-in-abbotsford-1.3138867

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Key Vancouver emergency rooms likely to crumble in major quake

VGH and St. Paul’s ERs among many aging Metro hospital buildings found to be at high-risk of collapse or being rendered useless by a strong tremor.

Vancouver’s two largest emergency rooms are at high risk of collapse in an earthquake, along with many other aging hospitals and health care buildings across the Lower Mainland.

New seismic risk assessments show major buildings that house hundreds of patients — including the Vancouver General Hospital’s 12-storey Centennial pavilion (built in 1959), the north building of the Jim Pattison pavilion that houses the VGH emergency department (built in 1978), and the almost 100-year-old St. Paul’s Hospital in downtown Vancouver — are at high risk to collapse or suffer widespread damage in an earthquake.

Major buildings at the UBC Hospital, Richmond General Hospital, Lions Gate Hospital, Burnaby General Hospital, Langley Memorial Hospital, the B.C. Children’s Hospital and the B.C. Women’s Hospital have also been flagged at the highest earthquake risk in the reports.

Many of Metro Vancouver’s hospital and health care buildings were built before 1970, when the province adopted modern seismic building codes.

Consequently, the concrete or masonry structures lack the elasticity and strength to “bend but not fail” with an earthquake’s shocks, and they are more likely to experience failure in the walls and columns that support the floors and ceilings, said Clint Low, a senior partner at Bush, Bohlman & Partners LLP, the structural engineering firm contracted to do the assessments.

“If it’s rated very high, it may not collapse during the earthquake but it’d likely be unsafe to occupy post-earthquake, which is a big issue for a hospital,” said Low. “If you can’t occupy your hospitals, where do people go?”

If emergency rooms were unusable, patients would likely be triaged by medical teams outside, like during the Stanley Cup riots in 2011, said Jeanette Beattie, the Lower Mainland director for Health Emergency Management B.C. There’s a mobile medical unit available.

The B.C. government has spent $2.2 billion to seismically upgrade or replace 214 schools since 2001.

But it has no seismic upgrade program for hospitals, despite their importance as a rallying point for displaced residents and a trauma centre for those injured in an earthquake.

Instead, seismic upgrades are typically done during large hospital redevelopments, or when an old hospital is replaced by a new structure, which is built to the latest earthquake code.

Health Minister Terry Lake said the government is spending all it can afford to upgrade and replace hospitals, which has amounted to more than $10 billion since 2001, and another $2.75 billion over the next three years.

“I think most British Columbians are realistic on this, they understand there’s a risk, and people on the Lower Mainland and Vancouver Island know that better than anybody,” he said in an interview.

“But they also know there’s a reasonableness and a limitation to how many tax dollars you can put to pulling that risk downward.”

The $1.2 billion replacement for St. Paul’s Hospital will be built to modern seismic codes and include a new emergency room. But it isn’t scheduled to open until 2022.

The new seismic assessments have so far only studied one-third of the area’s 208 health buildings, but has concentrated first on some of the oldest sites.

The data so far shows 51 per cent of structural blocks assessed so far inside health care buildings are at high risk. But the figure rises to 63 per cent at hospital sites. (Structural block may refer to an entire buildings or a structurally independent section of a large building.)

The Lower Mainland’s health authorities hired the structural engineering firm to update 15-year-old seismic reports.

“We haven’t (assessed) all of the blocks,” said Paul Becker, the chief facilities operating officer for the authorities’ shared Lower Mainland Facilities Management team. “That’s a funding issue.”

The structural data is being entered into a new earthquake database, which for the first time could give the region’s decision-makers a real-time look at the earthquake readiness of hospitals, as well as the cost to bring old buildings up to modern seismic codes.

The health authorities are this month expected to debate a 10-year earthquake master plan, which would have them spend up to $15 million to finish the seismic assessments, as well as provide more detailed engineering and cost estimates to strengthen specific buildings.

The final plan includes assessing non-structural hazards, like falling medical equipment or fragile utility lines for gas, electricity and water. If those items break, it could leave a hospital unable to operate even if its structure survives the initial tremors.

“There is no discreet line item at the health authority level for seismic (repairs) but that’s what the 10-year plan would do,” said Becker. “We’d say here’s the plan, here’s the funding, and let’s create line items we’d be accountable for.”

Opposition NDP leader John Horgan said the government needs a program and plan in place to ensure hospital safety in an earthquake.

“This strikes me as an area where (government) has been negligent at best, and potentially putting people at risk,” he said. “When a shaker comes, where are we going to take those injured and in distress? You want to take them to your acute care facilities and they too could be in rubble. That should be a major concern.”

Lake said government has spent five times more money on hospitals than schools since 2001, even without a dedicated seismic program for health care buildings.

The government has increasingly wrestled with whether it’s worth spending millions on seismic upgrades to aging hospitals, only to be left with old buildings that don’t meet modern medical needs, aren’t designed to infection-control standards, lack private rooms and are still beset by expensive problems in ventilation, electrical, plumbing and elevator services.

Increasingly, the government has opted to build new hospitals.

“The detailed analysis of risk would have to be put into the equation with the cost of mitigation, versus using those capital dollars towards a new investment,” said Lake.

Lake said numerous new hospital projects are in the works, including replacing the 1940s-era Shaughnessy building at B.C. Women’s hospital, $260-million for redevelopment at Royal Columbian Hospital and two new hospitals on North Vancouver Island. That’s in addition to the $512-million patient tower and emergency department at Surrey Memorial Hospital, which opened in 2013, as well as redevelopment at Abbotsford Regional Hospital.

Horgan called on the government to follow California’s lead. State law requires California hospitals to be structurally upgraded to withstand a strong earthquake by 2020.

“The intention was ultimately that hospitals should withstand an earthquake and remain operational after an earthquake,” said Eric Reslock, an assistant director in California’s Office of Statewide Health Planning and Development.

In addition, California health facilities have until 2030 to ensure their medical equipment and non-structural hazards are safety-proofed to be operational after an earthquake.

California’s laws were created in response to a damaging earthquake in 1971, and then updated after the 1994 Northridge earthquake, which killed 72 people and injured more than 11,000 during magnitude 6.7 tremors.

But the California state government didn’t put any money into paying for the seismic work. Instead, local counties, primarily responsible for buildings, had to fundraise or turn to taxpayers for billions in repairs. The state also has private hospitals that had to find the money themselves.

Currently, 90 per cent of California’s 3,000 acute-care buildings are considered earthquake safe, and the public has access to a seismic inspection database for all acute care facilities.

Lake rejected the California method.

“Our capital plan is very aggressive, so to go beyond what we’re doing, fiscally would be very difficult to sustain,” he said. “You could put in all the laws you want, but where’s the money going to come from?”

B.C.’s answer doesn’t necessarily involve massive funding to earthquake proof all the existing buildings, said Becker, who is leading the charge for the revitalized seismic program in Lower Mainland health authorities.

“We need to be much more clever than that, and not just throw money at the problem but be clever and intelligent and creative on how we mitigate those risks,” he said.

“So you could do a combination of structural and non-structural.”

Auditor General Carol Bellringer said in a report this week the government should do a better job informing the public about the condition of its physical assets, like hospitals, bridges and highways, and the long-term cost to keep them safe and operational.

Source: http://www.vancouversun.com/health/Vancouver+emergency+rooms+likely+crumble+major+quake/11152276/story.html

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Two small earthquakes recorded near Princeton and Penticton

Two small earthquakes recorded near Princeton and Penticton

Two earthquakes were recorded in southern B.C. this afternoon.

The first happened around 2:20, when a magnitude 2.2 earthquake was recorded three kilometres south of Princeton by the U.S. Geological Survey.

The second was a 2.5 magnitude earthquake, recorded by Earthquakes Canada, which happened six kilometres east of Penticton at 4:45 p.m.

Trevor Allen with Earthquakes Canada, said there was no reports of any damage.

“We would generally tend to see an earthquake of this magnitude [near Penticton] a couple of times a year,” he said.

“The reason it was widely felt…is it was so close to the town, and was also a shallow event as well.

While small earthquakes are relatively common off the coast of British Columbia, they are quite rare in the interior.

Source: http://globalnews.ca/news/2063363/small-earthquake-recorded-near-b-c-town-of-princeton/

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