Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake

Jeffrey Park; Teh Ru Alex Song; Jeroen Tromp; Emile Okal; Seth Stein; Genevieve Roult; Eric Clevede; Gabi Laske; Hiroo Kanamori; Peter Davis; Jon Berger; Carla Braitenberg; Michel Van Camp; Xiang'e Lei; Heping Sun; Houze Xu; Severine Rosat

doi:10.1126/science.1112305

Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake

Jeffrey Park, Teh Ru Alex Song, Jeroen Tromp, Emile Okal, Seth Stein, Genevieve Roult, Eric Clevede, Gabi Laske, Hiroo Kanamori, Peter Davis, Jon Berger, Carla Braitenberg, Michel Van Camp, Xiang'e Lei, Heping Sun, Houze Xu, Severine Rosat

Research output: Contribution to journal › Review article › peer-review

233 Scopus citations

Abstract

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 × 10²² 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.

Original language	English (US)
Pages (from-to)	1139-1144
Number of pages	6
Journal	Science
Volume	308
Issue number	5725
DOIs	https://doi.org/10.1126/science.1112305
State	Published - May 20 2005
Externally published	Yes

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10.1126/science.1112305

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@article{e363bbbc13b64cacaefd6df85e8ded80,

title = "Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake",

abstract = "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 × 1022 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.",

author = "Jeffrey Park and Song, \{Teh Ru Alex\} and Jeroen Tromp and Emile Okal and Seth Stein and Genevieve Roult and Eric Clevede and Gabi Laske and Hiroo Kanamori and Peter Davis and Jon Berger and Carla Braitenberg and \{Van Camp\}, Michel and Xiang'e Lei and Heping Sun and Houze Xu and Severine Rosat",

year = "2005",

month = may,

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doi = "10.1126/science.1112305",

language = "English (US)",

volume = "308",

pages = "1139--1144",

journal = "Science",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "5725",

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TY - JOUR

T1 - Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake

AU - Park, Jeffrey

AU - Song, Teh Ru Alex

AU - Tromp, Jeroen

AU - Okal, Emile

AU - Stein, Seth

AU - Roult, Genevieve

AU - Clevede, Eric

AU - Laske, Gabi

AU - Kanamori, Hiroo

AU - Davis, Peter

AU - Berger, Jon

AU - Braitenberg, Carla

AU - Van Camp, Michel

AU - Lei, Xiang'e

AU - Sun, Heping

AU - Xu, Houze

AU - Rosat, Severine

PY - 2005/5/20

Y1 - 2005/5/20

N2 - 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 × 1022 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.

AB - 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 × 1022 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.

UR - https://www.scopus.com/pages/publications/21044439958

UR - https://www.scopus.com/inward/citedby.url?scp=21044439958&partnerID=8YFLogxK

U2 - 10.1126/science.1112305

DO - 10.1126/science.1112305

M3 - Review article

C2 - 15905394

AN - SCOPUS:21044439958

SN - 0036-8075

VL - 308

SP - 1139

EP - 1144

JO - Science

JF - Science

IS - 5725

ER -

Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake

Abstract

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