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[Physltest] [Phys-L] Re: earthquake



At 08:20 PM 1/1/2005, I earlier wrote:

Here's a plausible description. The current model of continental motion
has it that plates of Earth surface move coherently. They are motivated
in part by upwelling of material from the hot, more fluid depths. Where
plate motion encroaches on an adjacent plate, one or the other dives.
The subduction zone is not friction-free. An earthquake such as the one in
review presently, was reported to indicate a depth of about 10 km for the
origin of the tremor. One can easily suppose that elastic strain energy is
stored in the plate, until the latch in the subduction zone gives way.
At this point, one expects to see the plate edge move roughly as far
as the upwelling zone has pushed the far edge of the same plate
since the last major slip.
The sound of your nails scratching on a blackboard has its counterpart
in the 0.05 Hz fundamental 'squeal' of a plate moving on another.
There may be theoretical justification for the talk of 30 meter drops
in a long slab of plate perimeter, or there may not be, but stick-slip
motion of plate boundaries is more or less a given.
Nobody, I take it, would seriously doubt this as a cause for Tsunami
events.

Brian Whatcott Altus OK Eureka!

Here's a useful tsunami description from Tulane
<http://www.tulane.edu/~sanelson/geol204/tsunami.htm>

Notice the snippet that offers that strike/slip alone
is not necessarily sufficient for a tsunami.



Brian Whatcott Altus OK Eureka!
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