Interesting,,   I'm amazed that such a small seismic event could be 
recorded from Alaska to South America, Hawaii to Norway with essentially 
a constant magnitude from Texas to Ohio with the Texas to Ohio time 
displacement of about 6 minutes???   And the real mystery,  why isn't it 
listed???   The European-Mediterranean Seismological Centre has a 4.1 
automated event listed for Honduras for about the right time, but I 
can't imagine it would be recorded in Hawaii, Alaska and Norway???
  Stephen

Bob Hancock wrote:
> 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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>   



  
  


Interesting,,   I'm amazed that such a small
seismic event could be recorded from Alaska to South America, Hawaii to
Norway with essentially a constant magnitude from Texas to Ohio with
the Texas to Ohio time displacement of about 6 minutes???   And the
real mystery,  why isn't it listed???   The European-Mediterranean
Seismological Centre has a 4.1 automated event listed for Honduras for
about the right time, but I can't imagine it would be recorded in
Hawaii, Alaska and Norway???

  Stephen



Bob Hancock wrote:

  
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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