Ha, of course they go with the more remote-chance cause of continuously linked San Andreas and Cascadia. Why not? Who cares about basic physics. These guys need money!
An M9-producing subduction zone is clean as a whistle, just like the big nuclear Japan one.
The clean zones tend to blow every 3-500 years according to Japanese tsunami records. All ocean zones accumulate tons of sediments from rivers, and ice ages, etc. To be clean as a whistle means there is an extraordinary mechanism. That is, every 300 years there is a 9m shove of all the sediments into the earth.
Looking at these things you see that Cascadia and San Andreas hasn't done anything since the last continental glaciation. I don't use 'Ice Age' because we are in a major ice cycle. Up in the crotch, we have subduction zones that are identically clean, but actually they all are. Nevertheless, I have it on good physics authority (mine) that these things love to blast together, and clean the clocks of the NA west coast.
One could follow the Scientific Method and do the simple physics, but not going to happen. No money in that. The US is getting rid of all science and Canadians are a bunch of leftie-weenies.
ps - a lesson on odds. This year is a banner year for walnuts. We walk under some walnut trees on the dog walk, You can hear them hitting the road like an explosion. I estimated the odds of getting hit at 1 in 100, and we walked through 10 times. Bang! one hit me. Ouch!
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