Is there a reference where I can find a discussion of this subject. I 
figured it was some sort of reflected wave. John did you send something?

John Cole wrote:
>
>
> ------------------------------------------------------------------------
> *From:* Geoffrey 
> *To:* psnlist@..............
> *Sent:* Sat, September 18, 2010 10:41:22 PM
> *Subject:* Re: Pis
>
> 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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