Bob McClure has written two helpful and educational programs that may
be found here:

http://jjlahr.com/science/psn/mcclure/

J-B_Plotter plots and curve fits data read in from J-B files in the format
provided on Larry's Public Seismic Network (PSN) site.   This is a good
companion to Alan Jones' Seismic Waves program.

SeisSim illustrates the response of a damped pendulum seismometer to various
driving functions and output filters. Many variables can be adjusted, such 
as the
period of the pendulum, the damping, and the filtering.

Both can be downloaded and run on a PC.

Enjoy!
John Lahr

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