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6.4 magnitude earthquake recorded amid swarms off Vancouver Island
Officials are closely monitoring a wave of earthquakes off the coast of Vancouver Island, where a 6.4-magnitude quake was recorded Thursday.
Since July 3, hundreds of earthquakes have occurred in the area, most of them registering between magnitude 3 and 5, John Cassidy, a seismologist with Natural Resources Canada, told Global News.
“It's a very active area,” he said.
“It’s a really complex tectonic area. Oceanic plates are forming and pushing into North America. But there are also faults in that area where these tectonic plates are sliding past each other, which is similar to what happened in today’s earthquake and most of the other earthquakes in the series.”
Thursday's 6.4 magnitude quake was about 200 kilometres off the coast of Tofino, Cassidy said, and while it was a large quake, the distance created a buffer zone for people living on the west coast of Vancouver Island.
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“There's a kind of horizontal sliding of one plate over the other,” Cassidy said.
“Since it's this horizontal motion, we don't usually see tsunamis from this type of motion or this type of earthquake. But we've had a few hundred events over the past week.”
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Cassidy added that aftershocks are expected as a result of Thursday's earthquake, and these tremors are expected to continue in the coming days.
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The wave of earthquakes is expected to stop within the next few days or week.
He added, “These earthquakes have nothing to do with faults or subduction faults in any way.”
“So, we don’t expect any connection between these offshore events and other earthquakes that happen closer to land. So, these events don’t tell us that we’re closer to a bigger earthquake or that the probability of a bigger earthquake is lower or higher.”
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This is an active earthquake zone and there have been major earthquakes in the past, Cassidy said.
In 1918, a magnitude 7.0 earthquake was recorded under Vancouver Island, and a magnitude 7.3 earthquake was recorded under the island in 1946.
A 7.8 magnitude earthquake has been recorded off the coast of Haida Gwaii.
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“Big earthquakes happen here, and they will happen again in the future,” Cassidy said.
“We don’t know when, but the research we’re doing is really aimed at understanding what we can expect in terms of ground shaking during future earthquakes, whether those earthquakes happen tomorrow, in 10 years, in 50 years.”
&2024 Global News, a division of Corus Entertainment Inc.
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