PSN-L Email List Message

Subject: Re: Pis
From: Thomas Dick dickthomas01@.............
Date: Mon, 20 Sep 2010 20:11:01 -0500


I just stumble onto it this summer. We have had many good (as rated by 
the someone out of Memphis or St. Louis) small quakes in the Guy, 
Arkansas, Arcadia, Oklahoma to the New Madrid, MO fault area (8 to 2.5 
degrees distance). I started noticing this "wave" was identified on 
WinQuake and seem to be there. Would this really be off the core, mantle 
or one of those discontinuity "things"?

GPayton wrote:
> Absolutely RIGHT, Winquake does list PIS, but only in the Jefferys 
> Bullen Table (1940). 
>  
> I went to this site:
> http://www.ucl.ac.uk/es/people/sammonds/3%20Seismic%20Rays%20Earth%20Structure.pdf  
>
> and only found that the small ( i ) means " Wave reflected at outside 
> boundary of inner core (e.g., PKiKP)."  I did not find a direct 
> reference to Pis, but it would seem that it is a P wave reflected off 
> the inner core and concerted to a S wave.
>  
> *_WHY it would appear BEFORE the P wave is unknown_*. 
>  
> Hope this helps someone somewhere............
>  
> Jerry

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