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- W2030651873 abstract "The source mechanism of the Saitama earthquake (36.07°N,139.40°E, Ms = 5.4) of July 1, 1968, is studied on the basis of P-wave first motion, aftershock, long-period surface-wave data and low-magnification long-period seismograms recorded in the nearfield. A precise location of the aftershocks is made using P and S—P time data obtained by a micro-earthquake observatory network. The synthetic near-field seismograms based on the Haskell model are directly compared with the observed near-field seismograms for wave form and amplitude to determine the dynamic fault parameters. The results obtained are as follows: source geometry, reverse dip slip with considerable right-lateral strike-slip component; dip direction, N6°E; dip angle 30°; fault dimension, 10 × 6 km2; rupture velocity, 3.4 km/sec in the direction S30°E; average dislocation, 92 cm; average dislocation velocity, 92 cm/sec; seismic moment, 1.9 · 1025 dyn-cm; stress drop, 100 bar. The effective stress is about the same as the stress drop. For major earthquakes in the Japanese Islands, the dislocation velocity, 〈.D〉, is found to be proportional to the stress drop, σ. This relation can be expressed by 〈.D〉 ∼- (β/μ)σ, where β is the shear velocity and μ is the rigidity. This result has an importance in engineering seismology because the stress drop scales the seismic motion in the vicinity of an earthquake fault." @default.
- W2030651873 created "2016-06-24" @default.
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- W2030651873 date "1975-07-01" @default.
- W2030651873 modified "2023-10-14" @default.
- W2030651873 title "Static and dynamic fault parameters of the Saitama earthquake of July 1, 1968" @default.
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- W2030651873 doi "https://doi.org/10.1016/0040-1951(75)90018-9" @default.
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