Ferndale 7.0 Today

[g...@theconnection.com]

Hello Al,

This morning I heard a loud sound from my cell phone ( I had never heard this before), we are in the Bay Area, message was “move to higher ground, tsunami warning.” I then went to my seismometer display PC to see what that was about. It was just beginning to fill my screen. See https://theconnection.com/   In order to see the peaks I had to turn down the sensitivity by a factor of 20 on the most sensitive display. Also it looks as if that quake knock off my Lehman, probably needs to be reset. A few days ago there was a short news item on the internet about a group of seismologists that were working in the marsh lands of the Oregon coast. They were looking for the remnants of a 9.0 quake in the area in the early 1700’s. See https://earthquake.usgs.gov/earthquakes/eventpage/official17000127050000000/impact   The group was trying to find out when next really big one was going to hit the area.

Take Care,

Gary

 

 

 

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[John Beale]

I'm near Portland OR, in the initial process of testing a simple DC-response tiltmeter, not intending for it to be a seismometer at all. Although of course for large enough signals, it will be. I picked this one up pretty clearly. The peak showed almost 1 pF change in capacitance from my AD7747 based sensor (the step-changes are from getting up and returning to a nearby desk.) A rough calculation shows the quake moved my 10 cm pendulum through about 15 microns peak to peak, for a total local-vertical angular change of 0.15 milliradians, or 30 arc seconds.
https://photos.app.goo.gl/KTd74FUS3QHB6DoW6

-john beale