PSN-L Email List Message

Subject: Re: Tajikistan earthquake swarm
From: Dave Nelson davenn@...............
Date: Fri, 07 Jul 2006 20:17:07 +1000

   Hi Jon
               this is a MAJOR fault zone   being on the western side of=20
the India -Asia Collision Zone.  this whole region from Tajikistan right to=
the east across the Tibetan Plateau is undergoing severe compression as=20
India rams its way into the Asian Continent.  As a result many thrust and=20
strikeslip form as the material is squeezed
out to the eastern and western sides of the zone.
   in this region you will find that most of the river valleys are actually=
that have been eroded out by riverflow as the crushed rock in the fault=20
line is softer than the surrounding material.

   You can do a basic model this effect for yourself  using a block of=20
semi-rigid material
like childrens play-dough as Asia and push a smaller width block of  wood=20
into one side
and watch the play-dough squeeze out the sides

   look here for pic of basic idea

Dave N

At 12:47 AM 7/07/2006 +0000, you wrote:
>Hi all
>There has been a intresting earthquake swarm in Tajikistan since 03:57
>last night. It got started off by a mag 5.7 earthquakes, there has been
>alot of aftershock activite. The largest aftershock has been a mag 4.7.
>I find the location intresting, since there isn't any subduction zone
>there or other type of fault zone. Aftershock activite is still ongoing
>according to emsc-csem.
>J=F3n Fr=EDmann
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