Computer Science – Numerical Analysis
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22....9t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 1, p. 9-12
Computer Science
Numerical Analysis
13
Earthquakes, Geological Faults, Japan, Plates (Tectonics), Seismic Waves, Seismology, Sliding, Tsunami Waves, Moments, Numerical Analysis, P Waves, Predictions, Subduction (Geology), Tensor Analysis
Scientific paper
The fault geometry and slip distribution of the Hokkaido Nansei-oki, Japan, earthquake of July 12, 1993 are estimated using seismic wave, tsunami, and geodetic data. The Moment Tensor Rate Function inversion from P waves shows one nodal plane shallowly dipping to the west and the other nodal plane steeply dipping to the east. The best depth is estimated as 10-15 km. The source time history consists of an initial pulse with a duration of 10 seconds and moment release of 2 x 10(exp 20) Nm, followed by a complex rupture for at least 40 seconds. The Centroid Moment Tensor (CMT) solution shows one nodal plane shallowly dipping to the east and the other steeply dipping to the west. The overall seismic moment is estimated as 5.5 x 10(exp 20) Nm (M(sub W) 7.8). The joint inversion of geodetic data data on Okushiri Island and tsunami waveforms in Japan and Korea shows that the largest slip, about 6 m, occurred at a small area just south of the epicenter. This corresponds to the initial rupture on a fault plane dipping shallowly to the west. The slip on the northernmost fault, dipping to the east, is about 2 m. The slips on the southern faults, dipping steeply to the west, are more than 3 m. Total seismic moment of 4.9 x 10(exp 20) Nm, estimated from the slip distribution, is similar to the estimate from CMT inversion.
Ruff Larry
Satake Kenji
Tanioka Yuichiro
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