PSN-L Email List Message

Subject: RE: Honduras Quake 5/28/09
From: "Kareem Lanier" system98765@.............
Date: Thu, 28 May 2009 14:48:59 -0700


Since Rayleigh waves are vertical but vertical geophones are more designed
for vertical, higher frequency motions, would the geophone still pick up
these Rayleigh waves very well?

Also, in regard to the 20 second statement, does this mean that twenty
seconds pass before the second wave crest passes the sensor's location? What
does that look like on the seismogram? Seems like the record wouldn't
display much of a dramatic signature would it? Or would it display smooth
wavy lines?

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Brett Nordgren
Sent: Thursday, May 28, 2009 2:26 PM
To: psn-l@..............
Subject: Re: Honduras Quake 5/28/09

Hi Gary,

Are they slow - 20 second period or so?  Sounds like the surface waves to
me.  Fifteen minutes is about what we saw from the first P wave to the
beginning of the surface waves.


At 02:07 PM 5/28/2009 -0700, you wrote:

>That quake really came in strong on my Lehman. But I have a question, 
>about 15 minutes after the P and S wave, the amplitude of the response 
>just explodes. What are we seeing here, how do I explain this to others.


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