PSN-L Email List Message
Subject: Re: Would Any Of Yous Guts Believe This ?
From: Brett Nordgren brett3nt@.............
Date: Sat, 01 Aug 2009 12:52:14 -0400
Thomas and Geoff,
Although we go up to 30Hz, the background noise in the area usually
obliterates any small higher-frequency phases.
I don't think we were seeing anything but surface waves from the Honshu
quake. But...... with a10 second LoPass filter your recent Pacific 5.2 at
108 degrees from LA did show a clearly visible Pdiff and then about 18
minutes of various body phases which I don't have the experience to
identify, followed by some big surface waves.
What does your noise level look like, Thomas?
At 09:36 AM 8/1/2009 -0500, you wrote:
>>Hello All you Happy face PSN folks;
>>I think I just received a pP signal
>>from a 5.0 Japanese quake with
>>my SPZ sensor and I'm over
>>80 deg away.
>I am at 92 degrees. Yes lots of noise. Not doing audio but on the vertical
>could the pP actually be a PcP or P? And did you get a peak at the arrival
>(sharp peak) of SS and LQ ... could the complex of waves at the arrival of
>S be due to the depth of the quake ... to a lesser extent, there are peaks
>on the E-W Lehman but not the N-S.
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