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Effects of fault finiteness on near-source ground motion

Archuleta, Ralph J. and Hartzell, Stephen H. (1981) Effects of fault finiteness on near-source ground motion. Bulletin of the Seismological Society of America, 71 (4). pp. 939-957. ISSN 0037-1106.

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Near-source ground motion at four azimuths but constant epicentral range is computed from a buried circular strike-slip fault in a half-space. Particle acceleration, velocity, and displacement at each station on the free surface is computed in the frequency band 0.0 to 5.0 Hz. The assumed dislocation is derived from the Kostrov (1964) displacement function for a continuously propagating stress relaxation. The azimuthal variations in the amplitudes and waveforms directly result from spatially varying slip on the fault, spatially varying radiation pattern over the fault, and the magnitude and direction of the rupture velocity. The near-source ground motions are dominated by the rupture in the direction of the receiver. Using a 100-bar effective stress (initial stress minus sliding friction) in a Poisson solid with β = 3.0 km/sec the shear wave speed, and shear modulus μ = 3.0 × 10^(11) dyne/cm^2, the simulated earthquake has a moment M_o = 4.5 × 10^(25) dyne-cm. Using a rupture velocity of 0.9β, the peak acceleration is 1195 cm/sec^2 and velocity 10^4 cm/sec for the receiver directly on strike. For a receiver 30° off strike, the maximum acceleration 236 cm/sec^2 occurs on the vertical component.

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Additional Information:© 1981, by the Seismological Society of America. Manuscript received November 14, 1980. The authors wish to thank John Boatwright and Tom Hanks for preliminary review of this paper. We are grateful for the assistance of Norman Abrahamson and John Ketchens in executing the plot programs for most of the figures. Part of this work was done on behalf of the Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission.
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Nuclear Regulatory Commission (NRC)UNSPECIFIED
Issue or Number:4
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Official Citation:Ralph J. Archuleta and Stephen H. Hartzell Effects of fault finiteness on near-source ground motion Bulletin of the Seismological Society of America, August 1981, v. 71, p. 939-957
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49163
Deposited By: Ruth Sustaita
Deposited On:03 Sep 2014 14:53
Last Modified:03 Oct 2019 07:11

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