I think it has to do with the CORE of the EARTH.
Liquid will not pass "S" Waves.
The solid iron/nickle core acts as both a
shield and lens at the same time.
You will not see the standard phases through the earths core.
Or so I understand,
[P,S] They will be greatly attenuated or totally gone.
Phases can change from one to the other like P to S
and S to P as they reflect or refract here and there.

"S" does not pass through any kind of liquid.

Best Regards,
geoff

----- Original Message ----- 
From: "Gary Lindgren" 
To: 
Sent: Saturday, July 24, 2010 8:58 AM
Subject: RE: PI Earthquakes as seen from GVA


> Geoffrey,
> Those were very deep quakes, over 600 Km. Is that why WinQuake can't locate
> the P and S waves on my machine. I'm in Palo Alto CA.
> Gary
> 
> 
> 
> 
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... On
> Behalf Of Geoffrey
> Sent: Saturday, July 24, 2010 3:07 AM
> To: PSN-LIST
> Subject: PI Earthquakes as seen from GVA
> 
> I compared the theoretical times with my received times
> and heres what I am able to see.
> These Quakes were in the shadow zone.
> 
> 7.6 quake
> PKiKP
> PP 
> SKpdf + SKiKP 
> PSKsdf + SP
> PS
> 
> 7.4 quake
> PKiKP
> PP
> SKpdf + SKiKP
> 
> did you in the usa receive these phases also ?
> 
> Very Deep Quake, Nothing I could call a surface wave.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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