Pete-

I'm in Santa Barbara, California. I measure the period of the 
pendulum with an optical interrupter. The quake pushes the pendulum a 
little bit to make a momentary increase or decrease in the period.

The colored lines indicate atmospheric conditions. There's a legend 
above the graph. The graph layout is described here:
http://www.bmumford.com/mset/courthouse/graph.html

The basic timing tool is described here:
http://www.bmumford.com/microset.html

I recorded a more dramatic effect from a much closer earthquake in 1999:
http://www.bmumford.com/mset/tech/quake/index.html


-Bryan


>Hi Bryan
>Welcome to the group. You will find many interesting an talented 
>folks here. Where are you located? Tell us how you are monitoring 
>the period of the clock. What is your sensor? What do all the 
>different color lines mean?

-- 

Bryan Mumford
__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.