You are seeing the surface wave arrivals.  The waves are slower and  
travel through the crust of the earth rather than down into the mantel  
and returning.  The Love waves precede the Rayleigh waves.  The Love  
wave is a horizontal wave visible on the transverse channel.  The  
Rayleigh wave is a vertical wave that is visible on the vertical and  
radial channels.  Depending upon the orientation of a single channel  
horizontal instrument, and the ray path to the event, you could see  
both Love & Rayleigh waves.

Bob Hancock


On May 28, 2009, at 2:07 PM, Gary Lindgren 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.
> Gary
>
>
>
>
> Gary Lindgren
> 585 Lincoln Ave
> Palo Alto CA 94301
>
> 650-326-0655
>
> www.blue-eagle-technologies.com   Check out Lastest Seismometer  
> Reading
> cymonsplace.blogspot.com
> dtvtransitioninfo.blogspot.com        Information on how to cope  
> with the transition to DTV
>
>

You are seeing the surface =
wave arrivals.  The waves are slower and travel through the crust =
of the earth rather than down into the mantel and returning.  The =
Love waves precede the Rayleigh waves.  The Love wave is =
a horizontal wave visible on the transverse channel.  The =
Rayleigh wave is a vertical wave that is visible on the vertical and =
radial channels.  Depending upon the orientation of a single =
channel horizontal instrument, and the ray path to the event, =
you could see both Love & Rayleigh =
waves.

Bob Hancock =
 


On May 28, 2009, at 2:07 PM, =
Gary Lindgren 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.
Gary
 
 
 
 
Gary =
Lindgren
585 =
Lincoln Ave
Palo =
Alto CA 94301
 
www.blue-eagle-technologies.com    Information on how to cope with the transition to =
DTV
 
 

=
=