PSN-L Email List Message

Subject: RE: Subduction Zone Profiles
From: Jay Muza jmuza@...........
Date: Thu, 4 Mar 2010 22:48:19 -0500

Jerry, there is an interesting paper at
tions/Newsletters/Issue14.pdf, which may be something similar to what you a=
re interested in...and other issues of the same newsletter.  Bob might be i=
nterested in  I have a p=
aper where I have done drill cored biostratigraphy across the Middle Americ=
a Trench where you can clearly see the subduction of pelagic sediments and =
associated faulting along the decollement as the Cocos plate begins its des=
cent into the mantle.  It is interesting to note the compression of the sed=
iments above the basaltic ocean crust as it is subducted..almost an immedia=
te 30% reduction in thickness...probably more than you want to know, but th=
e seismic profile of the subduction zone in this paper is nice.

Dr. Jay Muza
Department of Physical Sciences
Broward College
Davie, FL  33314

Office: 954.201.6771
Cell:    954.736.8231

From: psn-l-request@.............. [psn-l-request@............... On Behalf=
 Of GPayton [gpayton@..............
Sent: Thursday, March 04, 2010 7:10 PM
To: psn-l@..............
Subject: Re: Subduction Zone Profiles

Thanks Bob,

That is what I was afraid of.  I also seen those few exceptions.  Probably =
too much trouble for anything but exceptional events.  Oh well.
----- Original Message -----
From: Bob Hancock
To: psn-l@..............
Sent: Thursday, March 04, 2010 6:04 PM
Subject: Re: Subduction Zone Profiles

Jerry -

The data you request used to be listed a lot more often that it is now.  I =
checked the current list of recent earthquakes and only found it the data l=
isted on two events, the M 8.8 Chile, and the M 7.0 Ryukyu Islands.  When l=
isted you will find it under the Scientific & Technical tab, and it is call=
ed Seismicity Cross Section.  I also checked most of the M 6.0 + listings o=
n the 8-30 day list and did not find any with Seismicity Cross Section.  I =
can remember this being listed much more often a few years ago than is curr=
ently done.

The published focal mechanism is another source for the fault geometry at t=
he point of rupture, but it does not give the overall long view that you ob=
tain with Seismicity Cross Section.

Bob Hancock

On Mar 4, 2010, at 3:31 PM, GPayton wrote:

Thank you Chris.

I obviously was not clear with my question. I am not looking for diagrams, =
explanations or animations.  \

For example, suppose I was interested in the Juan De Fuca Plate sub under t=
he North American Plate and wondered what its side profile looked like.  I =
realize it is much more shallow there than the trenches in the South Pacifi=

My curiosity may be too detailed and not available except in an expensive t=
echnical journal or scientific site not accessible to me, I don't know.

Thank you for you reply.
----- Original Message -----
From: ChrisAtUpw@.......
To: psn-l@..............
Sent: Thursday, March 04, 2010 4:17 PM
Subject: Re: Subduction Zone Profiles

In a message dated 04/03/2010, gpayton@............. writes:
I was wondering if there is an online site that one may look at to see what=
 the actual profile view of the location of an event?

Please Note: Due to Florida's very broad public records law, most written c=
ommunications to or from College employees regarding College business are p=
ublic records, available to the public and media upon request. Therefore, t=
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