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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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2004年12月26日 Sumatra-Andaman 地震の理論歪地震波形の計算と観測波形の比較

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Title: 2004年12月26日 Sumatra-Andaman 地震の理論歪地震波形の計算と観測波形の比較
Other Titles: Calculation of Theoretical Strain Seismogram by Normal Mode Theory and Comparison with Observed Data from the Sumatra-Andaman Earthquake of December 26, 2004
Authors: 池上, 裕1 Browse this author
岡本, 大志2 Browse this author
中西, 一郎3 Browse this author
小久保, 一哉4 Browse this author
Authors(alt): IKEGAMI, Yutaka1
OKAMOTO, Taishi2
KOKUBO, Kazuya4
Issue Date: 15-Mar-2006
Publisher: 北海道大学大学院理学研究科地球惑星科学専攻(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 69
Start Page: 221
End Page: 231
Abstract: The great Sumatra-Andaman earthquake of December 26, 2004 is studied by using extensometer (strain-meter) as very-broard-band seismograph. We analyze the strain seismograms obtained by 100 m extensometers installed at Matsushiro Seismological Observatory. Japan Meteorological Agency. We compare the observed strain seismograms with thouse calculated by normal mode theory and obtain fairly good agreement between the observed and calculated seismograms for a five-sourcse model with a moment magnitude of 9.3 and a source duration of about 600 sec. We find a peculiar strain change right after the passage of Rayleigh wave in the NS component of the strain seismograms. This strain change cannot be explained by the summation of normal modes and double-couple type sources.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第69号

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