PSN-L Email List Message

Subject: My new tiltmeter detected it's first quake
From: George Bush ke6pxp@.......
Date: Mon, 09 May 2005 22:10:42 -0700

I am in the last stages of completing a new instrument here at Sea Ranch,
CA, and a nice quake came along and I was able to see it on the

The quake was: 

M4.4 64km from Sea Ranch, CA USA, 5 km ( 3 mi) ESE of The Geysers, CA 

and the PSN server tiltmeter files are: 

left	This actually shows the P and S arrivals,
but the quality is terrible as the quake sloshes the mercury and this is
a high-Q oscillation. Oh well, I built it to detect Earth tides primarily
and any quake detection is just icing on the cake.

and 050509.223011.longsrt.psn

leftThis is a longer time plot of the above
and I am not certain, but it looks like the ground maybe changed tilt
when the quake arrived???

If this project is of interest to you, go to my website at and click on The "Tiltmeter Project" and you
can see my writeup and pictures on the construction of the instrument.

George Bush

Sea Ranch, CA, USA

38.73775N, 123.48882W

[ Top ] [ Back ] [ Home Page ]