More than 150 tremors have hit Vancouver Island in the last 24 hours, and seismologists are monitoring the situation to see if it turns into an Episodic Tremor and Slip event.

Tiny tremors (not felt) return to . More than 150 during the past 24 hours - stretching from the to . Stay tuned to see if this might be ETS 2018:

B次元官网网址� John Cassidy (@earthquakeguy)

Vancouver Island is normally moving toward the Lower Mainland at a rate of about one centimetre per year.

B次元官网网址淔erry fares keep going up but the distance is actually getting a little bit shorter,B次元官网网址� jokes John Cassidy, seismologist with the Geological Survey of Canada.

But every 14 months or so there is a Tremor and Slip event B次元官网网址� a discovery made by two local scientists Gary Rogers and Herb Dragert B次元官网网址� when Vancouver Island slips backwards a few millimetres towards Japan. Seismic recording instruments show Victoria moving in one direction and then changing direction for about two weeks during these episodes. These events add pressure to the locked Cascadian Subduction Zone fault.

B次元官网网址淚t involves tiny tremors that we can record. They are not earthquakes. People donB次元官网网址檛 feel these shaking events. But we can easily record them over many seismic stations at the same time,B次元官网网址� said Cassidy. B次元官网网址淚t looks like a train or a rumbling.B次元官网网址�

You can see the energy building up slowly and then dropping off slowly, says Cassidy. ItB次元官网网址檚 not a typical earthquake signature. ItB次元官网网址檚 more of a rumbling vibration sort of signal.

The tremors are recorded and mapped out, to show where the slip is taking place. It helps to identify the locked portion of the subduction fault where all the energy is being stored for future earthquakes.

B次元官网网址淭his is a really important piece of information to help us understand the subduction zone where these big earthquakes are more likely to occur,B次元官网网址� said Cassidy. B次元官网网址淚t doesnB次元官网网址檛 help us predict when an earthquake will occur, though.B次元官网网址�

Due to the fact that Episodic Tremor and Slip events give a slight nudge to a locked fault, it is a period of slightly higher hazard but Cassidy assures that it is not a huge change.

B次元官网网址淚t is similar to driving in slightly heavier traffic than you normally would. There might be slightly more risk,B次元官网网址� said Cassidy. B次元官网网址淏ottom line is that we live in a subduction zone where earthquakes can happen at any time. These tremors are a reminder to us that we do live in an active zone and to be prepared.B次元官网网址�

It will take a week of monitoring the situation to see if a slip takes place.

Good question. The last ETS event (tremor + slip - see: ) on south/central Vancouver Island was March-April 2017. There have been several other small/short bursts of tremor since - mostly to the east of this region - with no measured slip (so not ETS).

B次元官网网址� John Cassidy (@earthquakeguy)