At periods greater than 1000 seconds, Earth’s seismic free oscillations have anomalouslylarge amplitude when referenced to the Harvard Centroid Moment Tensor faultmechanism, which is estimated from 300- to 500-second surface waves. By using morerealistic rupture models on a steeper fault derived fromseismic body and surface waves,we approximated free oscillation amplitudes with a seismic moment (6.5 x 1022NewtonImeters) that corresponds to a moment magnitude of 9.15. With a ruptureduration of 600 seconds, the fault-rupture models represent seismic observationsadequately but underpredict geodetic displacements that argue for slow fault motionbeneath the Nicobar and Andaman islands

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

BRAITENBERG, CARLA;
2005

Abstract

At periods greater than 1000 seconds, Earth’s seismic free oscillations have anomalouslylarge amplitude when referenced to the Harvard Centroid Moment Tensor faultmechanism, which is estimated from 300- to 500-second surface waves. By using morerealistic rupture models on a steeper fault derived fromseismic body and surface waves,we approximated free oscillation amplitudes with a seismic moment (6.5 x 1022NewtonImeters) that corresponds to a moment magnitude of 9.15. With a ruptureduration of 600 seconds, the fault-rupture models represent seismic observationsadequately but underpredict geodetic displacements that argue for slow fault motionbeneath the Nicobar and Andaman islands
http://www.sciencemag.org/content/308/5725/1139.full
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/1690732
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