PSN-L Email List Message

Subject: Re: Arkansas quakes
From: Canie canie@...........
Date: Wed, 05 Oct 2011 18:54:50 -0700

That segment of the fault is always moving - it's 'well oiled' - but 
it still does increase the stress in the area at the 'ends' where the 
fault isn't likely to creep along - where it's locked and it will all 
release in a big quake shortly..

the little quakes are where the land is moving a little bit - 
increases the stress on the land around that spot - The InSAR 
graphics can show that the best..

After a large quake, the smaller shocks are the land adjusting to the 
new position of the blocks around the fault - before, it's just buildup.


At 06:50 PM 10/5/2011, you wrote:
>  And just how would these small quakes be increasing stress?  If 
> one uses Holliser, CA as an example,  the small quakes and fault 
> creep reduces stress build up. It does not increase the stress.
>On 10/5/2011 12:06 PM, Canie wrote:
>>It would take 27,000 magnitude 3's to relieve the stress of a mag 
>> would take 729 MILLION magnitude 3s to relieve a magnitude 8..
>>The only thing these smaller quakes do is to actually raise the 
>>stress levels..
>>At 08:02 AM 10/5/2011, you wrote:
>>>Probably not.  The release of energy in small amounts, by whatever 
>>>cause, probably is good as it relieves stress.  Remember, there 
>>>were some BIG earthquakes in the New Madrid area between December 
>>>1811 and February 1812.
>>>If petroleum exploration and extraction is the cause of these 
>>>seismic events, it is probably doing a great service to the area. 
>>>by relieving stress in small increments.
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