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Subject: Okhotsk quake
From: Steinar Midtskogen steinar@.............
Date: Mon, 24 Nov 2008 15:25:27 +0100

Today's 7.0 Okhotsk quake was recorded by my SEP seismometer.  Not a
huge signal, but clear enough.

PNG image:

However, what's a bit surprising is that at the exact same time of the
arrival of the P wave my 4.5 Hz geophone recorded something pretty
strong as well for a few minutes.  Mostly in the Z direction but
clearly in the other directions as well.

Sac-file Z:
PNG image Z:
Sac-file N:
Sac-file E:

Will a quake nearly 7000 km away every show up on a 4.5 Hz geophone?
Or could a distant quake trigger a small local quake?  Or are the
events unrelated?

Since this happened in daytime, and it's a bit windy outside today
also, there is quite a bit of noise, but the quakes are clear enough.

Steinar Midtskogen

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