Local

UW seismologist isn't worried about latest trio of earthquakes

By KIRO 7 News Staff and MYNORTHWEST Staff
By KIRO 7 News Staff and MYNORTHWEST Staff

PORT HARDY, British Columbia — UPDATE: A trio of earthquakes measured over 6.5 hit off the coast of Vancouver Island late Sunday, but UW seismologist Mouse Reusch argues that it's nothing out of the ordinary.

Mouse Reusch is the Pacific Northwest Seismic Network Regional Coordinator, and told KIRO Radio’s Colleen O’Brien all about what went down Sunday night.

“The larger events were a couple of strike slip earthquake events that happened on the Explorer plate, which is subducting under the North American plate,” said Reusch.

Strike slips are types of faults where two plates slide against each other side-to-side, most commonly associated with the San Andreas fault in California.

Comparatively, the Cascadia Subduction Zone, where seismologists predict the “Big One” would potentially come from, is one plate shoved underneath the North American plate, producing more of an “up and down” motion.

The effect created from a strike slip fault is the reason Los Angeles will eventually shift right next door to San Francisco in about 50 million years, give or take.

So knowing all that, is this latest collection of quakes on the Explorer plate just the first step on the way to the “Big One”? Not likely, says Reusch.

“The clustering is interesting, it’s definitely not unusual,” she said. “This has increased the chance of a Cascadia Subduction Zone or a Nisqually earthquake infinitesimally small. It’s basically the same odds yesterday morning as there are right now of the ‘Big One’ happening.”

As for activity on the Cascadia subduction right now, “it’s been pretty quiet,” Reusch assured us.

Click here to read the full story on mynorthwest.com.

Previous Coverage: 

Three powerful earthquakes struck late Sunday off the coast of British Columbia, Canada, near Vancouver Island, the U.S. Geological Survey reported.

According to the USGS, the first quake – magnitude 6.6 – hit about 10:39 p.m. PDT about 135 miles (218 kilometers) southwest of Port Hardy, Canada. It occurred at a depth of about 6.8 miles (11 kilometers).

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Less than 40 minutes later, a second quake with a recorded magnitude of 6.8 struck nearby, about 122 miles (197 kilometers) southwest of Port Hardy. It occurred at a depth of about 6.2 miles (10 kilometers.)

A third 6.5-magnitude quake was reported at 11:22 p.m. PDT about 138 miles (223 kilometers) southwest of Port Hardy. Its depth was also about 6.2 miles (10 kilometers).

No damage or tsunami warnings were reported.

The quakes are not on the Cascade Subduction Zone, but just west on the Juan de Fuca plate.

The earthquakes are happening where the Explorer plate runs into the Juan De Fuca plate off of Vancouver Island. This is a fairly common place for earthquakes to occur.

The "Big One" geologists are expecting some day is along the Cascadia Subduction Zone.

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