GREAT information.  I knew the degree information, but was not aware of the 
"Theoretical P-Wave Travel Times" feature that you point out.  I'd seen it 
before, but did not realize what the dark bold lines meant.  THANKS
Jerry


  ----- Original Message ----- 
  From: Stephen & Kathy
  To: psn-l@..............
  Sent: Thursday, September 17, 2009 3:31 PM
  Subject: Re: P & S Shadow Zones


  Hi, the approx. P wave shadow zone would be from 103 to 140 degrees from 
the quake location.  So, you would be in the shadow zone of any quake that 
is approx 103 to 140 degrees from you.  Any mapping program that would draw 
a circle around your location at 103 and 140 degrees will work.

  Here is a link to more info on the P wave shadow zone:
  http://earthquake.usgs.gov/learning/glossary.php?termID=170&alpha=S

  The usgs also draws a world map for quakes of mag 5 and above with the 
shadow zone marked.

  start here:
  http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/quakes_big.php

  When you get to the list, click on the    Date and Time   link of any 
given quake.
  Click on the    Scientific & Technical    tab
  Find and click the    Theoretical P-Wave Travel Times    link
    enjoy,

    Stephen
    PSN Station #55
    near Pilot Hill Ca USA
    38.828N  120.979W


  GPayton wrote:
    Gentlemen,

    Is there a software package or applet that allows you insert YOUR 
geographical location (Lat. & Long.) and output exactly where on the globe 
YOUR P wave and S wave shadow zones would be?

    Thanks,
    Jerry






GREAT information.  I knew the degree information, but was not =
aware=20
of the "Theoretical P-Wave Travel Times" feature that you point =
out.  I'd=20
seen it before, but did not realize what the dark bold lines =
meant. =20
THANKS
Jerry
 
   

  
----- Original Message ----- 
  From:=20
  Stephen &=20
  Kathy 
  
To: psn-l@.............. 
  
Sent: Thursday, September 17, =
2009 3:31=20
  PM
  
Subject: Re: P & S Shadow =
Zones
  

Hi, the approx. P wave shadow zone =
would be=20
  from 103 to 140 degrees from the quake location.  So, you would =
be in the=20
  shadow zone of any quake that is approx 103 to 140 degrees from =
you.  Any=20
  mapping program that would draw a circle around your location at 103 =
and 140=20
  degrees will work.

Here is a link to more info on the P wave =
shadow=20
  zone:
http://earthquake.usgs.gov/learning/glossary.php?termID=3D170=
&alpha=3DS

The=20
  usgs also draws a world map for quakes of mag 5 and above with the =
shadow zone=20
  marked.

start here:
http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/quakes_big.p=
hp

When you get to the list, click on the    Date =
and Time=20
    link of any given quake.
Click on the    =
Scientific &=20
  Technical    tab
Find and click the    =
Theoretical=20
  P-Wave Travel Times    =
link
 =20
  enjoy,
 =20
  
  Stephen
  =
PSN=20
  Station #55
  near Pilot Hill Ca USA
  38.828N =20
  120.979W


GPayton wrote:=20
  

    
    

    
Gentlemen,
    
 
    
Is there a software package or applet that allows you insert =
YOUR=20
    geographical location (Lat. & Long.) and output exactly where on =
the=20
    globe YOUR P wave and S wave shadow zones would be?
    
 
    
Thanks,
    
Jerry