Open AccessModeling 3‐D wave propagation and finite slip for the 1998 Balleny Islands earthquake
Author(s) -
Hjörleifsdóttir Vala,
Kanamori Hiroo,
Tromp Jeroen
Publication year - 2009
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2008jb005975
Subject(s) - geology , seismology , slip (aerodynamics) , surface wave , crust , kinematics , waveform , earth structure , seismic wave , mantle (geology) , geodesy , geophysics , physics , optics , classical mechanics , quantum mechanics , voltage , thermodynamics
We simulate surface waves in a 3‐D Earth model using a spectral element method for existing kinematic source models of the M W 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.