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EnglishAt 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
| Titolo: | Earth’s free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake |
| Autori: | |
| Data di pubblicazione: | 2005 |
| Rivista: | |
| 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 |
| Handle: | http://hdl.handle.net/11368/1690732 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1126/science.1112305 |
| URL: | http://www.sciencemag.org/content/308/5725/1139.full |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
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