Second Crotch Earthquake was tacked on at the end

 

The last M7.8 came at the end of the M7.4, confirmed by the aftershock sequence.

This is an 80km long fault, and has more than twice the energy of the first one.

The first one was a 40km weeny.  So, I think I can call this first one an official foreshock.  That keeps up my one in a hundred chance of any given earthquake being a foreshock for a larger one.  However, subduction foreshocks usually have a full magnitude or two difference from the main shock.  That's 10 to 100 times the energy.

Therefore, I now call this 7.8 to be a foreshock for an M9 at 100 to one.  So, the odds of a super-tsunami remains at 100 to 1 for the next month or two.  After that, it can go down to the background level of 1 in 500.  No need to get your knickers in a twist, you coastie people live with this all the time, and you have lots of time to run to the high ground.  Check your routes!

If geophysics had any money, this would be a great time to replace the rusty signs, and get some drills going.

ps I'm talking in fantasy odds now, but if this goes in the mechanism I expect, it will be both sides and a 'shaped charge'.  That means two M9's on both legs.  That's one heck of a clamping force, almost orgasmic.  Since there is no money for a direct tsunami energy measurement, they will grossly underestimate the run-up for the tsunami.  Do me a favour, and when they say that's 'far enough' to run, go a bit further.  Have insurance, and be prepared to say good-bye to your stuff.  I'm pretty sure you can't pack up your car and go.  Those stupid roads always go parallel to the coast, and a million people will want to drive.

ps all the stuff they attribute to the Cascadia zone are from this thing.  You would get a big argument if you said this to a geophysicist, but they don't exist anymore.  They were all purged with the climate change thing.  So, the record from Japan in 1700 or so was this bouncing off Vancouver and hitting them.  All the huge markers of tsunami run-up are from this and not Cascadia, which is a dead fish fault.  Remember that anything I say will not end up in the Artie stomach.

ps most likely no more earthquakes, and this is the end of it.  I'm glad since it is such a horrible thing.