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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.
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, meer
Peer reviewed article  

Beschikbaar in  Auteurs 


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

    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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