Publication Date:
2005-05-21
Description:
At periods greater than 1000 seconds, Earth's seismic free oscillations have anomalously large amplitude when referenced to the Harvard Centroid Moment Tensor fault mechanism, which is estimated from 300- to 500-second surface waves. By using more realistic rupture models on a steeper fault derived from seismic body and surface waves, we approximated free oscillation amplitudes with a seismic moment (6.5 x 10(22) Newton.meters) that corresponds to a moment magnitude of 9.15. With a rupture duration of 600 seconds, the fault-rupture models represent seismic observations adequately but underpredict geodetic displacements that argue for slow fault motion beneath the Nicobar and Andaman islands.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Park, Jeffrey -- Song, Teh-Ru Alex -- Tromp, Jeroen -- Okal, Emile -- Stein, Seth -- Roult, Genevieve -- Clevede, Eric -- Laske, Gabi -- Kanamori, Hiroo -- Davis, Peter -- Berger, Jon -- Braitenberg, Carla -- Van Camp, Michel -- Lei, Xiang'e -- Sun, Heping -- Xu, Houze -- Rosat, Severine -- New York, N.Y. -- Science. 2005 May 20;308(5725):1139-44.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology and Geophysics, Yale University, Post Office Box 208109, New Haven, CT 06520-8109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15905394" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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