PSN MEMBERS
I have a long period (20 sec.) Lehman sensor and live in So. Calif. where 
there is usually a lot of seismic activity between 1.1 and 2.5 magnitude.  
Could someone advise me of the appropriate frequency filter I should have to 
monitor quakes at long distance (worldwide) and concurrently the ones that 
happen locally.  Should it be a low pass filter set at 3hz, 10hz or 20hz?  Or 
do I need a separate short period seis. for local quakes?
Jim Allen
Cerritos, Calif.
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