Just iP which means Impulsive arrival
or eP which is an emerging weave.
i or e can come before the P ?

But like Are you saying the first of the P phases is
what is called just plain P ??

So if you get a Pn or Pg first you can call either
one of those simply "P" ?



--------------------------------------------------
From: "Stephen Hammond" 
Sent: Monday, September 20, 2010 6:14 AM
To: 
Subject: RE: Pis

> 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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