Physics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...52...85y&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 52, Issue 1-2, p. 85-101.
Physics
5
Scientific paper
Using a waveform inversion method, we studied the rupture processes of two deep earthquakes in the Izu-Bonin region. The earthquake source was modelled by space-time-dependent slip on a fault plane. The fault plane was divided into many subfaults, and the source was expressed in terms of the final dislocations on the subfaults, the rupture starting times at the subfault corners and the rise time of source function. From P-wave seismograms recorded by the Global Digital Seismograph Network, we first obtained the displacement waveforms by deconvolution techniques. Next, we inverted these waveform data to determine the model parameters. For the earthquake near Torishima on March 6, 1984, non-homogeneous stress distribution and variation in rupture velocity were revealed. The rupture initiated at a corner of a 54 × 36 km2 fault, and high-stress drop occurred in the middle region of the fault, about 30 km away from the initiation. The earthquake south off Honshu of April 24, 1984, did not have as complex a rupture process. The rupture propagated unilaterally with almost constant velocity.
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