An updated version of "Interpreting Seismograms -- A Tutorial for the
AS-1 Seismograph" is available at: http://web.ics.purdue.edu/~braile/edumod/as1lessons/InterpSeis/InterpSeis.htm.
You can also link to MS Word and PDF versions for convenient printing.
Please let me know if you have comments or suggestions. I hope that the
tutorial will be useful to AS-1 and other educational seismograph operators.