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Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake
Park, J.; Song, T.-R.A.; Tromp, J.; Okal, E.A.; Stein, S.; Roult, G.; Clevede, E.; Laske, G.; Kanamori, H.; Davis, P.; Berger, J.; Braitenberg, C.; Van Camp, M.; Lei, X.; Sun, H.; Xu, H.; Rosat, S. (2005). Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake. Science (Wash.) 308(5725): 1139-1144. http://dx.doi.org/10.1126/science.1112305
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, meer
Peer reviewed article  

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Auteurs  Top 
  • Park, J.
  • Song, T.-R.A.
  • Tromp, J.
  • Okal, E.A.
  • Stein, S.
  • Roult, G.
  • Clevede, E.
  • Laske, G.
  • Kanamori, H.
  • Davis, P.
  • Berger, J.
  • Braitenberg, C.
  • Van Camp, M., meer
  • Lei, X.
  • Sun, H.
  • Xu, H.
  • Rosat, S., meer

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 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.

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