Modeling 3-D wave propagation and finite slip for the 1998 Balleny Islands earthquake
Por:
Hjörleifsdóttir V., Kanamori H., Tromp J.
Publicada:
1 ene 2009
Resumen:
We simulate surface waves in a 3-D Earth model using a spectral element method for existing kinematic source models of the Mw 8.1, 25 March 1998 Balleny Islands earthquake. The 3-D model incorporates lateral variations in the crust and mantle on the basis of models Crust2.0 and S20RTS. Our objective is to investigate the fit of the observed and simulated long-period surface waves in the hope of improving on the existing source models. We modify a body wave model determined by Henry et al. (2000) to improve the fit of long-period surface waveforms. We demonstrate that adding a smooth component of slip extending over a fault that connects the two subevents determined by Henry et al. (2000), without invoking slip on multiple fault planes or on unconnected fault patches, provides reasonable fits to long-period surface waves as well as body waves. Copyright 2009 by the American Geophysical Union.
Filiaciones:
Hjörleifsdóttir V.:
Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States
Lamont-Doherty Earth Observatory, Palisades, NY, United States
Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964-8000, United States
Kanamori H.:
Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States
Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States
Tromp J.:
Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States
Department of Geosciences, Princeton University, Princeton, NJ, United States
Department of Geosciences, Princeton University, Princeton, NJ 08544, United States
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