Earth's free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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

Type de publication:

Journal Article

Source:

Science, Volume 308, Ticket 5725, p.1139-1144 (2005)

ISBN:

0036-8075

URL:

http://www.sciencemag.org/sub/activate/ISOL

Mots-clés:

MULTIPLETS; EXCITATION; SPECTRA; RECORDS; STRAIN; DOMAIN; MHZ

Résumé:

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.

Notes:

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