The Oklahoma Geological Survey has some good annotated

daily long period seismogram records posted here:

http://www.okgeosurvey1.gov/seis/seis.index.2002.html

These will give you some idea of what to look for with

your AS1 systems.  It would be helpful if more seismic web

sites would add annotation to their posted helicorder

records.  In fact the annotation could be automated from the

catalog of earthquakes.