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

Northwest mobile unit to help those at heart of mental health, addiction crisis

Province, Northern Health unveils new unit in Terrace to bridge gaps in services

Dust advisory from Smithers to Burns Lake

Smithers, Houston and Burns Lake dusty enough to warrant an air quality advisory.

Aussies buy majority stake in Red Chris mine

Company looks forward to relationship with Tahltan Nation

Houston Poker fun

Congratulations to the winners of the Third Annual Houston Snowmobile Club Poker… Continue reading

B.C. minister says rural internet is ‘railroad of the 21st century’

Jinny Sims talks details about the $50-million provincial and possible $750-million federal funds

Sparks fly as SUV speeds down wrong side of Highway 1 trying to flee RCMP

Captured on video, the vehicle headed westbound against oncoming traffic before crashing

Trudeau calls May 6 byelection for B.C. riding of Nanaimo-Ladysmith

The riding opened up when Sheila Malcolmson resigned in January

B.C. VIEWS: The hijacking of our education system gathers speed

Children taught to strike and shout fringe far-left demands

Judges on Twitter? Ethical guidance for those on the bench under review

Canadian judges involvement in community life are among issues under review

Calgary captain has 3 points as Flames torch Canucks 3-1

Giordano leads way as Alberta side cracks 100-point plateau

1,300 cruise ship passengers rescued by helicopter amid storm off Norway’s coast

Rescue teams with helicopters and boats were sent to evacuate the cruise ship under extremely difficult circumstances

B.C. university to offer first graduate program on mindfulness in Canada

University of the Fraser Valley says the mostly-online program focuses on self-care and well being

Province announces $18.6 million for B.C. Search and Rescue

The funding, spread over three years, to pay for operations, equipment, and training

Late-season wave of the flu makes its round in B.C.

BC Centre for Disease Control reported 50 per cent jump in flu cases in first weeks of March

Most Read