Re: Techtonics of Sumatra Earthquake

From: Dora Smith (villandra_at_austin.rr.com)
Date: 12/30/04 

Date: Thu, 30 Dec 2004 02:22:02 GMT

I have my own questions, but first to answer these - no, the reports are
saying Sumatra moved upward a hundred feet, and it is expected to have moved
upward by maybe a few feet - and maybe some parts of it.

What moved upward is a part of the fault zone where the quake occurred.
They are real unclear on if the upward motion was a hundred feet or several
meters, and I don't know how they know the direction was up.

As for predicting that two plates are going to collide - of course. They
know that the Australia/ India plate (s) are subducting under the Eurasian
plate - of which the "Sunda" and "Burma" plates are some kind of subplates
with no defined significance that I've been able to find.

The difficulty is in knowing when pieces of the plate will hang up or break
lose. 

--
Yours,
Dora Smith
Austin, Texas
villandra@austin.rr.com
"Raj V" <rvaught@houston.rr.com> wrote in message
news:8V1Ad.28320$yv2.2646@fe2.texas.rr.com...
> I've been pretty much out of the loop on the geology/geophysics of the
> recent quake. One of the news programs indicated Sumatra moved west north
> west about 100 feet???
>
> I can't exactly remember the names of the relative plates, but is this not
> an area where the (Borneo plate??) is subducting from west south west
under
> Sumatra?  Could they have been referring to the relative movement of
> Sumatra?
>
> Does anyone know the depth to the hypocenter?
>
> Any other geophysics or links to more scientific information would be
> appreciated.
>
> Thanks,
> Raj
>
>

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