PSN-L Email List Message

Subject: Re: big quake
From: The Lahrs johnjan@........
Date: Sun, 18 Jun 2000 14:38:09 -0600


The focal mechanism (one on the links on the page given below) indicates
strike slip faulting.

If the fault is oriented NS, parallel to the ridges seen in
the ocean-bottom topography, then the event was left lateral strike slip.

Maybe subduction into the trench to the northeast is faster/easier than the
northward motion of the Indian plate in the collision zone of the Himalayas.
This would then be a mirror image of the 7.6 right
lateral strike slip events in the Gulf of Alaska in 1987 and 1988.


At 01:43 PM 6/18/00 , you wrote:
>At 10:25 AM 6/18/00 -0700, you wrote:
> >The NEIC reports it as the; south Indian Ocean, and believed
> >to be the largest known earthquake for the area.  Mw 7.5  See:
> >
> >
> >
>         The location of this quake is very interesting. I looked at the 
> history
>display and noticed very few previous quakes in the area. The shallow
>ridges on the ocean floor look sort of like spreading ridges. I didn't
>think that spreading centers caused large earthquakes such as this. I
>wonder if we are seeing the start of a volcano?
>George Bush
>Sea Ranch, CA, USA
>38.74N, 123.5W
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John C. Lahr
1925 Foothills Road
Golden, CO 80402
(303) 215-9913

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Larry Cochrane <cochrane@..............>