Corrected URL: Sumatra Earthquake recorded by school seismograph stations
From: John or Jan Lahr (johnjan@lahr.org)
Date: Thu Dec 30 2004 - 08:16:28 PST
Message-Id: <6.1.1.1.2.20041230080359.01df9800@mail.comcast.net>
Date: Thu, 30 Dec 2004 08:16:28 -0800
From: John or Jan Lahr <johnjan@lahr.org>
Subject: Corrected URL: Sumatra Earthquake recorded by school seismograph stations
Woops, I've corrected the URL's for the educational stations within the
message below.
Pete Modreski, thanks to alerting me to this mistake!
Also, at the end of this message I've added a note from Michael Hubenthal
of IRIS which
includes a link to an excellent New York Time web site on the
earthquake. Some of the
pictures are quite graphic, so some caution is advised.
Yours,
John
*************************************************************************************************************
(Original message with corrected URL's)
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://jclahr.com/science/psn/as1/heli/allas1.php. This page
shows how eleven of these stations looked on the day of the
earthquake:
http://jclahr.com/science/psn/as1/indonesia04/as1indo.html
.
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
*************************************************************************************************************
(New message from Michael Hubenthal.)
All,
Below is a fantastic resource for you and your students to explore the
12/26 event and the resulting Tsunami. By far it is the best and most
interesting set of Tsunami materials I have ever seen and can envision
a wide variety of classroom uses.
Best Wishes,
Michael Hubenthal
Education Specialist
IRIS Consortium
Tel- (607) 777-4612
Email- hubenth@iris.edu
www.iris.edu
Begin forwarded message:
Subject: Tsunami graphic
See the link below for wonderful graphics of the timing and extent of
the tsunami:
http://www.nytimes.com/packages/khtml/2004/12/26/international/ 20041227_QUAKE_FEATURE.html
click on
"wave reach" to see the timing of the wave
and
"simulation" to see the very interesting shape of the tsunami as it
propagates to the west. This explains why there was not major impact
in Australia. Note also how if dissipates as it passed the underwater
90E ridge in the middle of the Indian ocean.
David
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: Mon Aug 01 2005 - 16:06:46 PDT