PSN-L Email List Message

Subject: Re: What are the implications of a M2.8 quake near the San
From: George Bush ke6pxp@.......
Date: Mon, 19 Jul 2010 08:33:32 -0700


Hello Mauro-

Thank you for your thoughts and suggestions! I agree with you on the 
importance of these quakes and willtry to set up some procedure for 
monitoring and graphing them.

George

At 12:14 AM 7/19/2010, you wrote:
>Hello,
>
>from far Italy i guess sharing some experience we have here may be useful.
>
>Single, spot event usually don't lead to any precursor.
>Look to event sequences instead.
>Check for sequence of earthquakes, they have to belong to the same 
>fault system and/or be focused on a constrained area (which can be 
>also rather large, this depends on the seismogenetic structures).
>
>Usually dangerous eq sequences follows the seismo structure you have.
>Check then on the historical records of that area for as back in 
>time you can go and try to see time related patterns.
>
>Often the huge ground blocks push to each other and a fault depend 
>on the other, for sure you can find lot of literature about it for your area.
>
>Then draw a chart of magnitude of earthquake (Y axis) and time (X 
>axis) and see if magnitude and frequency increase or decrease. Pay 
>much attention if frequency and magnitude stops suddenly.
>
>If eq sequence go up in frequency and magnitude, stay in alert.
>If eq sequence go slowily down in freq. and magnit. probably is only 
>an ew swarm that will exaust with no damages.
>
>best regards
>Mauro
>
>
>
>Il 18/07/2010 23:32, George Bush ha scritto:
>>Hello-
>>
>>This morning we had a M2.8 quake about 4 miles west of us out in the
>>ocean and about 5 miles from the San Andreas fault that runs to the East
>>of us. It was on a minor fault that runs parallel to the San Andreas.
>>The shock knocked my data acquisition computer off-line, but was strong
>>enough to jiggle the pen on my drum recorder that also was off line!
>>
>>I am wondering if the movement of the minor fault will add strain or
>>relieve strain on the San Andreas fault (add or decrease the chances of
>>the San Andreas fault letting-go).
>>
>>I would appreciate any thoughts or opinions on this from you PSN folks.
>>
>>
>>George Bush
>>Sea Ranch, CA, USA
>>38.73775N, 123.48882W
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>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with the body 
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>See http://www.seismicnet.com/maillist.html for more information.

George 

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