To Me it is a P wave which strikes the Inner Core then is reflected as an S wave but that's kind of
ridiculous to think about since the outer core is liquid and No S waves can travel
through liquids.
An S wave in the inner core will go round in there until it dampens to nothing.

--------------------------------------------------
From: "Thomas Dick" 
Sent: Monday, September 13, 2010 12:07 AM
To: 
Subject: Pis

> Using Winquake, particularly on regional events, the vertical and 
> broadside Lehman show a peak well ahead of P which it designates as Pis. 
> I can't find a reference to it. Is this some old designation for a core 
> or mantle reflection? 
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