Physics
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217304t&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 17, CiteID L17304
Physics
36
Seismology: Earthquake Source Observations (1240), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Subduction Zones (1207, 1219, 1240), Seismology: Surface Waves And Free Oscillations
Scientific paper
While it is agreed that the great Sumatra earthquake of December 26, 2004 was among the largest earthquakes of the past century, there has been disagreement on how large it was, which part of the fault ruptured, and how the rupture took place. We present a centroid-moment-tensor (CMT) analysis of the earthquake in which multiple point sources are used in the inversion to mimic a propagating slip pulse. The final model consists of five point sources, with the southernmost sources accounting for the majority of the moment release. The presumed fault planes of the southern sources strike northwest, while those in the north strike northeast, consistent with the geometry of the subduction trench. Slip on the fault is found to be more oblique in the north than in the south. The inversion with five sources leads to a moment magnitude for the Sumatra earthquake of MW = 9.3, consistent with estimates from long-period normal-mode amplitudes.
Dziewonski Adam M.
Ekström Göran
Nettles Meredith
Tsai Victor C.
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