Sumatra Earthquake recorded by school seismograph stations
From: John or Jan Lahr (johnjan@lahr.org)
Date: Mon Dec 27 2004 - 16:45:38 PST
Message-Id: <6.1.1.1.2.20041227162452.01e69cf8@mail.comcast.net>
Date: Mon, 27 Dec 2004 16:45:38 -0800
From: John or Jan Lahr <johnjan@lahr.org>
Subject: Sumatra Earthquake recorded by school seismograph stations
The Sumatra earthquakes was easily picked up by the school seismograph
stations provided to teachers by IRIS
(http://www.iris.edu/edu/AS1.htm).
Of
the 100 or so such stations around the US, 17 are posting their records
on
the Internet every 10 minutes
(http://www.iris.edu/edu/AS1.htm).
This page
shows how eleven of these stations looked on the day of the
earthquake:
http://www.iris.edu/edu/AS1.htm
.
The Indian plate is subducting beneath the Burma plate and this earthquake
began rupturing the boundary near the west coast of northern Sumatra. The
point on the earth above that location was the "epicenter." The rupture continued
northward for at least 1,200 km along the boundary. The aftershocks that
occurred during the first 24 hours indicate the full extent of the rupture and
are show on this page:
http://jclahr.com/science/psn/as1/indonesia04/aftershks.html
John
##################################/ John C. Lahr
#################################/ Emeritus Seismologist
################################/ U.S. Geological Survey
===========================/ Geologic Hazards Team, MS966
##############################/ PO Box 25046
#############################//##############################
############################//###############################
Denver, Colorado 80225-0046 /################################
Phone: (303) 215-9913 /=============================
Fax: (303) 273-8540 /##################################
lahr@usgs.gov /###################################
/####################################
http://jclahr.com/science/
____________________________________________________________________
PS
Below is a message from Alan Kafka.
I put together a brief explanation of why the earthquake in Sumatra was so tragic, including some thoughts on how at least some of the tragic impact of future earthquakes might be reduced. Here is the link -
https://wfs.bc.edu/kafka/ed_seis/Sumatra_Quake.html
My intention was to give a short, simple, straightforward answer to the many questions I am getting about this earthquake. I also tried express a healthy balance between our responsibility to convey scientific information about an "interesting" earthquake, communicating my amazement at the incredible power of natural forces in the Earth, and concern about the human tragedy caused by large earthquakes.
Feel free to distribute this document if you find it helpful.
- Alan Kafka
Weston Observatory
Department of Geology and Geophysics
Boston College
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