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Tsunami Quake was Detected Everywhere...

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  • Bob Conrich
    ...even in Tristan New York Times SCIENCE Quake Lifted Earth s Surface Around Globe or, How to Get Your Name in the New York Times By WILLIAM J. BROAD
    Message 1 of 1 , Jan 13, 2005
      ...even in Tristan

      New York Times
      SCIENCE
      Quake Lifted Earth's Surface Around Globe
      or, How to Get Your Name in the New York Times
      By WILLIAM J. BROAD
      Published: January 13, 2005

      New studies of the giant earthquake that produced devastating tsunamis in the Indian Ocean show that its shock waves
      ricocheted around the globe for hours and lifted the earth's surface nearly an inch even half a world away.

      "They're like ripples in a pond," Dr. Richard C. Aster, a geophysicist at the New Mexico Institute of Mining and Technology,
      said yesterday. "But the pond is a sphere, so they keep going around and around."

      Dr. Aster, who compiled seismograms to measure the shock waves at increasing distances from the quake's epicenter, said the
      waves were 1,000 times the size of those that seismologists customarily measure.

      The colossal jolt struck Dec. 26 off the west coast of northern Sumatra, and the shock waves radiated out through the
      earth's rocky interior, traveling faster than waves do in air or water. Dr. Aster used data gathered by a global network of
      seismometers run by the Incorporated Research Institutions for Seismology, or IRIS, a consortium based in Washington that is
      financed mainly by the National Science Foundation. IRIS has nearly 150 member institutions at universities in the United
      States and abroad.

      The closest readings came from the Australian Cocos Islands, south of Sumatra, and Sri Lanka, and the farthest from Ecuador.
      The seismic data show the waves traveling around the earth for six hours.

      Dr. Aster said that even in Ecuador, the shock wave displaced the earth's surface more than two centimeters, or nearly an
      inch, but the movement was too slow to be perceptible to humans. The jolt was much sharper in Pallekele, Sri Lanka, and
      shook the ground over a range of nearly four inches, he said.

      Waves from the quake weakened as they bounced around the globe but were still discernible after making a complete loop. The
      seismogram from Tristan da Cunha, a group of British islands in the South Atlantic, shows the main wave arriving after a
      little more than an hour, then two smaller ones that circled the earth in two directions arriving after about 120 minutes
      and 230 minutes.


      Copyright 2005 The New York Times Company


      Bob's entry for the 2005 Curmudgeon Award:

      Dr. Aster seems to have done what the Nuclear Test Ban Treaty
      observers do every day in Vienna: turned on his computer and
      looked at seismic telemetry data from all over the world,
      noting the time and location of the waves. I think the main
      difference is the guys in Vienna didn't call the Times.



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