PSN-L Email List Message

Subject: Re: Would Any Of Yous Guts Believe This ?
From: "Geoffrey" gmvoeth@...........
Date: Sat, 1 Aug 2009 09:16:21 -0700

----- Original Message ----- 
From: "Thomas Dick" 
Sent: Saturday, August 01, 2009 7:36 AM
Subject: Re: Would Any Of Yous Guts Believe This ?

Geoffrey 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.

I can not see the signal with my own eyes and no processing. It only looks like the rest of the noise.
When i convert to a WAV file I can easily hear what
I can not see. When I do an fft, I can see it too
in Audacity. I go the time frame and filter in Winquake
I can barely get a time. But Although my time is not
good enough to report to the USGS I believe I have
the pP time since it matches that in theoretical
arrival times at my station to within a second
or so it seems. I see no other signals but what
I believe to be the pP wave. My lower limit
is like 23 seconds but I am only equalized
partially to 12 seconds. My meaningful range is about
12 seconds to 2Hz. Not wide as yours I bet.
All of you are seeing more detail than I
but Im using a one second Z only device.

I would like to know if any of you are seeing this on
one second or SPZ devices ?


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