Steve, Please don't take me wrong -- I am not arguing and I certainly 
don't have the educational background or equipment of the calibre of 
most like you and John...this all started with WinQuake. I took the 
9/15/10 New Madrid quake of  9:37:17.9@... degrees and 9/19/10 
Arcadia-Oklahoma city, OK quake of 22:03:48.6 @... degrees via Vase, I 
compared them to USIN 30 miles west of me and "something" is there.I 
even "see" something on the 4.5hz vertical geophone which I rate as low 
novice quality for the New Madrid as well as Oklahoma quake.

Stephen Hammond wrote:
> I once asked John Lahr this same question and he told me there was nothing
> before the P wave. I asked because I would see something before P in events
> that were south of me in Morgan Hill and Gilroy when my station was in South
> San Jose. 
> Regards, Steve Hammond PSN San Jose, Aptos, CA
>
> -----Original Message-----
> From: psnlist-request@.............. [mailto:psnlist-request@...............
> On Behalf Of Thomas Dick
> Sent: Sunday, September 19, 2010 7:44 PM
> To: psnlist@..............
> 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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