this particular area has frequent events of various magnitudes. not sure it has ever been linked to events further south. It is really not close to any urban area. It is near several faults and is fairly active. I can remember at least half a dozen or so in the last 25 years just off the coast from Petrolia.
It's at the southern tip of the Cascadia Subduction Zone and the Juan De Fuca plate. A larger one in this location could rip the whole fault line all the way to Vancouver Island. This scenario would be "the big one".
My USGS Link showed it as a 6.9, 7KM deep with a vertical uncertainty of about 25 KM, which seemed very strange to me. Real hard to get an earthquake 18 KM up into the atmosphere.
There were large underwater Earthquakes off the coast of Lyttleton (the "Harbour" side of Christchurch) prior to the series of large Christchurch EQs in New Zealand...
Earthquakes beget earthquakes... Mike's right; None are dismissable. I think our friends on the West Coast of Canada & the US may very well be in for the big one sooner rather than later.
My USGS Link showed it as a 6.9, 7KM deep with a vertical uncertainty of about 25 KM, which seemed very strange to me. Real hard to get an earthquake 18 KM up into the atmosphere.
it is difficult to monitor sub sea activity since instrumentation is all on land. you cant triangulate very accurately.
The last event was in 1700 and the average recurrence interval of Cascadia megathrust events is estimated to be 550-years. Not sure how accurate that number is, but it could certainly happen in the next few centuries.
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