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45+ Aftershocks From Yesterday's 7.7 EQ in Canada, Multiple 5 and 6-pointers Continue to Hit The Area, Eerily Reminiscent of Honshu EQ
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[quote:HaidaGwaiiRide 26290014:MV8yMDMxMzk2XzM0MTc0MDQ3X0VCMTQ5MjI2] Hey RedPaw, I think any theory is valid when you're dealing with a M7+ I question the 'experts' that claim this has nothing to do with the CSZ. In fact, it pisses me off because I think this is the most important time for people to prep. Let's look at the FACTS so far: The Queen Charlotte & San Andreas are TRANSFORM faults CONNECTED DIRECTLY to each end of the Cascadia Subduction Zone. Transform faults since they slide side to side normally don't displace water - So why was an urgent Tsunami warning issued? Was there vertical movement at the plate boundary as well they're not telling us about? The number and intensity of earthquakes after the M7.7 are almost the same as Tohuku except there's been dozens more. The last CSZ event was in 1700 - an M9.0 - This event was recorded by Japanese Tsunami record keepers and Coastal Indian tribes oral history - entire Indian villages on the coast were destroyed Historical CSZ frequency is every 300-800 years ETS was only discovered in 2000 - What they know about ETS is that it relieves some of the CSZ locked plate energy very deep, but it actually INCREASES the tension nearer the surface, causing a mega slip when it goes. The big difference between Tohuku and Cascadia is the fact that the Juan de Fuca plate is locked between the Pacific and North America Plate - check out the graphic here http://commons.bcit.ca/civil/students/earthquakes/unit1_02.htm I have not studied plate tectonics except for what I've taught myself on the web but I think the Juan de Fuca plate probably absorbs locked plate energy longer than just a standard 2-plate subduction zone. In my opinion, the downside to this is that when it finally goes, it goes bigger than anywhere else on Earth, possibly even higher than M9.0 As for destruction scenarios, I think that Vancouver Victoria Seattle Portland & Sacramento would see the most shaking from a CSZ event. You can expect fairly violent shaking for FOUR MINUTES! The shaking will be stronger than what Tokyo experienced because the subduction is actually almost directly below the first four cities. Our building codes are good though, and older structures have been seismically upgraded. Scary & lots of damage but survivable. The biggest threat would be the Tsunami - I think it has the potential to be worse than Japan's, because if it comes down the Strait of Juan de Fuca and wraps around into the Georgia Strait & Puget Sound it will be MASSIVE - Also Alaska, The Columbia River, California Coastal Bays to SF, & Hawaii would be devastated. Let's hope that the M7.7 was a 'normal' EQ and that we don't have to witness CSZ unhinging in our lifetimes. [/quote]
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Most recent 5.1 [
link to earthquake.usgs.gov
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4.4 [
link to earthquake.usgs.gov
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4.0 [
link to earthquake.usgs.gov
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4.2 [
link to earthquake.usgs.gov
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4.1 [
link to earthquake.usgs.gov
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4.8 [
link to earthquake.usgs.gov
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Another 4.1 [
link to earthquake.usgs.gov
]
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