There must be a convention for creating these designations just like
in Fire Control symbology. If you research geophysics and nomenclature
or the such possibly you can find the convention for creating these
labels in the first place.

Just a suggestion.


--------------------------------------------------
From: "Thomas Dick" 
Sent: Monday, September 20, 2010 2:43 AM
To: 
Subject: Re: Pis

> 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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