At least 200 tiny tremors hit between Victoria and Seattle on March 12. (@earthquakeguy/Twitter)

200 tremors recorded near Vancouver Island due to ‘tectonic dance’

The tremors were not felt but provide useful information to scientists

At least 200 tiny tremors were noted — not felt — between Victoria and Seattle on Tuesday.

According to John Cassidy, earthquake seismologist for Natural Resources Canada, the noted tremors are not earthquakes but shaking ground that can easily be recorded and monitored.

“[The wave recordings] look kind of like a windstorm coming in, things start to shake gradually, then they shake off a little more and then it rolls off slowly,” Cassidy explained.

RELATED: ‘Earthquake swarm’ strikes off Vancouver Island for past four days

Typically, Vancouver Island moves towards the Lower Mainland at a rate of approximately one centimetre per year but every 15 months or so, a ‘slip’ is recorded. First discovered by two local scientists, Gary Rogers and Herb Dragert, a tremor and slip event is when the Island ‘slips’ back a few millimetres into the ocean.

“In this region where we see tremors, [the plates] are actually going back and forth like a tectonic dance that Vancouver Island does every 14 or 15 months,” Cassidy noted.

Episodic tremor and slip is a very small, slow slip that occurs more frequently than the massive, sudden shifts that characterize a bigger earthquake. By tracking the number of tremors over a period of days scientists are able to tell if an episodic tremor and slip is occurring. This helps them understand the subduction fault beneath the earth including where it’s locked in place and where it’s storing energy aiding in what to expect during future earthquakes.

RELATED: More than 150 tremors hit Vancouver Island in the past 24 hours

“We know from earthquakes around the world that awareness and preparedness make a huge difference in minimizing the impact of earthquakes,” Cassidy said. “Getting under a table, holding on, being away from windows that might break or chimneys that might collapse.”

Cassidy added there is no need for panic but said these tremors are good reminders about the rock that we live on.

“This is an earthquake zone and earthquakes occur here on a regular basis, but larger earthquakes have occurred here and will occur in the future,” Cassidy said.



kendra.crighton@blackpress.ca

Follow us on Instagram
Like us on Facebook and follow us on Twitter.

Just Posted

Reader survey offers Free Press readers $5000 cash prize

The Free Press is offering readers the chance to win $5000 cash… Continue reading

SD5 drafts business case for Fernie school expansion

Ecole Isabella Dicken Elementary School is currently 30 per cent over capacity

District of Elkford celebrates grand opening of new municipal office

Submitted District of Elkford The District of Elkford has officially begun serving… Continue reading

GALLERY: Fernie hosts mine rescue competition

Fording River, Line Creek mine rescue teams off to provincials after placing first and second

Fernie beer named Canada’s best pale ale

Fernie Brewing Company’s Campout West Coast Pale finishes first at the Canadian Brewing Awards

Killer of Calgary mother, daughter gets no parole for 50 years

A jury found Edward Downey guilty last year in the deaths of Sara Baillie, 34, and five-year-old Taliyah Marsman

Wildfire between Jaffray and Cranbrook under control

A wildfire discovered yesterday between Jaffray and Mayook is now classified as… Continue reading

Raptors beat Bucks 120-102 to even series at 2-2

Lowry pours in 25 as Toronto moves within two games of NBA Finals

Body of missing snowmobiler recovered from Great Slave Lake

Police confirm the body is that of one of three missing snowmobilers

Toddler seriously injured after falling from Okanagan balcony

RCMP are investigating after a two-year-old boy fell from the balcony of an apartment in Kelowna

Cost jumps 35% for Trans-Canada Highway widening in B.C.

Revelstoke-area stretch first awarded under new union deal

Is vegan food a human right? Ontario firefighter battling B.C. blaze argues it is

Adam Knauff says he had to go hungry some days because there was no vegan food

Winds helping in battle against fire threatening northern Alberta town

Nearly 5,000 people have cleared out of High Level and nearby First Nation

Most Read