Re: Large Quake UnknownLocation
Posted by Lowell on May 25, 2001 at 14:03:38:

This was possibly a calibration pulse to test the working of the instrument.
Current Seismograms from Northern California show no activity at 8:29 UT or
or 8:29 PDT (15:29 UT).
For current seismograms see:
http://quake.usgs.gov/cgi-bin/helicorder.pl?2&0&latest