Tsunami warning ends for B.C. after large earthquake strikes off Alaska

Sirens sounded for coastal areas as people were warned to move to higher ground

A tsunami warning for coastal British Columbia and parts of Alaska has ended after a powerful earthquake struck about 250 kilometres southeast of Chiniak, Alaska, early today.

The quake struck at 1:31 a.m. PT Tuesday and prompted a tsunami warning for the entire B.C. coast and a tsunami watch for the entire U.S. West Coast.

tsunami

Officials in Esquimalt, B.C., welcome residents from Greater Victoria to a emergency centre set up after a tsunami warning on Tuesday. (Megan Thomas/CBC)

In Tofino, on the west coast of Vancouver Island, warning sirens were activated on the two main beaches in town, and people began evacuating to the emergency reception centres at the community hall and elementary school.

“Everything has proceeded in a really orderly fashion,” said Tofino Mayor Josie Osborn. “This is why we train, this is why we do exercises and this is why spend time making emergency plans and then testing them.”

 

The provincial emergency systems worked the way it was supposed to, said B.C.’s public safety minister.

“Whether it was in Esquimalt where we saw firefighters and first responders going door to door, or… Queen Charlotte City which was fully evacuated, or the sirens in Tofino and Ucluelet, and people going to their local emergency centres, people responded admirably and I think the emergency services did a remarkable job,” said Mike Farnworth.

The U.S. Geological Survey initially reported the quake’s strength at 8.2 early Tuesday and later revised that to 7.9, with a depth of 25 kilometres. At least three aftershocks were reported.

 

 

“This is a place in the world where we see historically a lot of large earthquakes,” said CBC seismologist Johanna Wagstaffe.

Wagstaffe said early data showed the movement of tectonic plates under the ocean was more of a side-to-side motion than what’s known as a mega-thrust.

“Mega thrusts are the ones we really worry about when it comes to widespread and large tsunamis because there is so much more vertical displacement of the ocean floor,” she said.

“Side-to-side can definitely still generate a tsunami, and again we are seeing a small one, but this motion doesn’t generate as large of a tsunami as what we would get with a mega-thrust.”

 

 

Environment Canada said the tsunami warning covered the Central Coast and Northeast Vancouver Island coast, including Kitimat Bella Coola and Port Hardy.

Emergency Info BC, directed by the province’s lead agency for disaster management, said there was also a tsunami warning in effect for the Juan de Fuca Strait coast, the outer west coast of Vancouver Island and Haida Gwaii. The warning did not include Vancouver.

The weather agency said people in coastal areas were at risk and should move to higher ground and heed further instruction from local authorities.

 

 

“If you’re in a threat zone, you want to evacuate inland or for higher ground, or depending on your situation, to a multi-storey building, a higher floor of a multi-storey building,” said Mike Gismondi, a meteorologist with Environment Canada in Vancouver.

The Emergency Info BC warning said people should move away from the water, off beaches, and away from harbours, marinas, breakwaters, bays and inlets. Boat operators should move their boats out to sea to a depth of at least 55 metres.

 

 

Trevor Jarvis, the emergency co-ordinator for the Village of Masset on the north end of Haida Gwaii, said he sent out an emergency text to residents and set off the tsunami emergency siren just after 2 a.m. on Tuesday. Everyone on the north end of the village was told to get to higher ground.

The quake struck  280 kilometres southeast of Kodiak, Alaska. People reported on social media that it was felt hundreds of kilometres away in Anchorage. Some said they saw the water retreating in Kodiak harbour, a possible sign that strong waves could return.

However, Kodiak police later said the tsunami warning was downgraded to advisory. They also said they received two reports that tide levels in the channel were fluctuating “by six inches to one foot.”

The U.S. Pacific Tsunami Warning Centre issued a tsunami watch for the state of Hawaii that was soon cancelled.

Source :

CBC

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World

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