Hello Bob;
me Not being a physics major or math person.
Thats Interesting since I had a s-p or s-L time
of 2 minutes and that translates to
600 + miles maybe 700. This event set off
my automatic recording which usually does
not happen unless the quake is about 4.0
at 400 miles. For some reason more energy then
expected has arrived at this station sort of like
what bubbleheads ( submarine sailors )
might call a convergence zone
which happens in the ocean with sound waves.
Maybe quake waves in the earth behave like
sound waves in the ocean and are lazy which
will focus the energy at discreet distances
from the event. By lazy I mean they seem
to bend ( refract ) to the slowest velocity hitting the surface
with concentrated focused energy
in concentric rings around the event out to
some distance. Such behavior requires enough
depth of the strata to allow for this bending to happen.
Does this mean possibly deep crust or from the mantel ?
I should imagine the moho would keep a CZ zone
from the crust because it would reflect at that point
and divide the energy instead of refracting it.
What do you think might be going on that
would concentrate the energy from a less than
usual quake to set off my recording alarm ?
I understand wave velocity changes is the best way
to guess how waves are effected as they propagate.
Any sudden change is like a mirror and a gradual
change is like a lens.
I understand a transmitted ( radio wave ) signal can be bent
by having a series of antennas with a phasing
slightly later from antenna to antenna so that
the delaying of the phases of a single wave
will make the antenna behave as a massive
variable lens thus the phased array kind of antenna
or wullenwebber array.
Since we can not do what mother nature has
not already done in one way or another I can
imagine the earth itself is somehow making
areas of more and less energy as energy spreads
away from the focal point. I must have been
in an increased energy point if the quake
was less than 4.0 and 600 miles away.

Regards;
geoff


----- Original Message ----- 
From: "Bob Hancock" 
To: 
Sent: Saturday, November 01, 2008 8:16 PM
Subject: Re: unusual frequency


> This event appears to be consistent with other low magnitude events  
> that  have occurred to the Southwest of Tucson, AZ.  I have seen other  
> events that are similar, and no information was ever posted on them.   
> I noticed the event was visible across the lower 48 states, and  
> southern Alaska.  It is most likely less than M 4.0 as that is the  
> USGS minimum cutoff for display of information on international events.
> 
> Bob Hancock
> 
> 
> On Nov 1, 2008, at 2:53 PM, Geoff wrote:
> 
>> Hello Mr. Thomas Dick;
>> My Sensor located very close to 33.42138N  -111.57477W about  
>> 507Meters above mean sea level.
>> I saw that TUC near Tucson also saw this signal about 1336 to 1338  
>> on 31OCT2008 UTC.
>> I have not analyzed it to get an accurate and precise time simply  
>> because I can not
>> tell for sure it is in fact an Earthquake. If no one else is  
>> reporting it I do not trust
>> what I am looking at. In order for me to properly read a signal it  
>> takes extra effort
>> which translates to opportunity costs ( such as Battlefield 2142  
>> time ) so I will not
>> pursue more knowledge in detail if I can not verify the source  
>> beforehand.
>> The distance seems 600 miles to 700 miles from here maybe magnitude 4
>> but nothing seems to match that as of my last look.
>> Regards;
>> geoff
>>
>> -
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