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More8/26/20
8/26/20
Or it was coming from deep underground, maybe around 3.5 on the Richter scale. Evidently we are now having warms of small quakes here that are too faint for most people to feel. They think these are shallow quakes caused by stresses in the crust caused by oil and gas extraction, and fracking getting into some faults and acting like a lubricant causing them to slip.
But if the vibration is at the right frequency, it will cause resonance and thus apparent amplification at the surface.
After all, the whole west Coast area is part of the Ring of Fire.
8/27/20
8/27/20
Well, Seattle is entirely built on a geologically recent lahar flow, which all that is needed is a good sized quake to cause soil liquefaction and massive destruction.
Not sure about how seismically active the area around Portland is, but soil liquefaction is a huge problem in that whole region. That is what did so much damage in the 1989 earthquake in San Francisco, and before that, the 1906 earthquake.
8/27/20
8/27/20
1989 was bad. I knew someone living there whose house was so badly damaged they walked away. Eventually rebuilt, sold it and got out.
8/27/20
I've never been in a quake strong enough to really have it click "earthquake", although there was an incident over a decade ago where the microwave oven, which due to the poor architectural design of the place, hangs from the ceiling with some chains. I noticed it swinging slightly but didn't feel anything, kind of like maybe from a very heavy wind gust.
But it turned out there had been a gigantic explosion at a (fortunately) unmanned gas processing plant about 45 miles away about a couple of minutes before. It might have been such a shock wave through the ground that it set up some vibrations. I found that out a couple of hours later, and kind of connected the dots then.
8/27/20
I remember hearing a lot of discussion about it on the 2 meter band local repeater as it unfolded, then got home and turned on the news. Of course the phrase that was first to surface was what everyone had been primed to expect decades ago - "The Big One?"
It's one of the reasons that California was a "no go" area since I was little - because I'd always heard it was going to fall into the Pacific at any time. Then of course I learned about tsunamis, soil liquefaction, and that while plate tectonics meant the sliding into the Pacific would take longer than modern humans have been walking the earth, the 1906 earthquake was just a "preview of the coming attractions - now in Cinemascope and infra surround sound".
So I wasn't going to even consider investing in an area overdue for "a whole lotta shakin' goin' on" and figured anyone was a fool for living there, or especially for building there.
And of course it was just a matter of which flattened the area first - The Big One or the Soviet nuclear missiles. And I go - "nope - not going to go to a place that is already doomed".
8/27/20