I downloaded data from the TUC receiver (STS-1) for a one hour block 0800 to
0900 UTC on September 17 from IRIS through the VASE program.  The Tucson
sensor records at 20 SPS.  It most likely is a seismic event; however, it is
weak enough that initial P & S waves are indistinct.  The surface waves (LQ
& LR) were visible at elevated levels for over 4 minutes.

I have recorded supersonic overflights at my station (west of Tucson) before
and you get two sharp spikes, very close together, and nothing that
resembles surface waves.  I normally record at 100 SPS.

This event was recorded by several sensors from the US Network and displayed
on the ASL heliplots.  The displays from ASL are filtered at 0.02 hz, which
is a long period display.

Bob Hancock




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