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AIR FORCE CAMBRIDGE RESEARCH LABORATORIES L. G. HANSCOM FIELD, BEDFORD, MASSACHUSETTS
Abstract
Displacement, particle velocity, and acceleration wave forms in the near field of a propagating fault have been computed by numerical integration of the Green's function integrals for an infinite medium. The displacement discontinuity (dislocation) on the fault plane is assumed to have the form of a unilaterally propagating finite ramp function in time. The calculated wave forms in the vicinity of the fault plane are quite similar to those observed at the strong motion station nearest the fault plane at the Parkfield earthquake. The comparison suggests that the propagating ramp time function is roughly representative of the main features of the dislocation motion on the fault plane, but that the actual motion has somewhat more high frequency complexity. Calculated amplitudes indicate that the average final dislocation on the fault at the Parkfield earthquake was more than an order of magnitude greater than the offsets observed on the visible surface trace. Computer generated wave form plots are presented for a variety of locations with respect to the fault plane and for two different assumptions on the relation between fault length and ramp function duration.
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M. D. TRIFUNAC A three-dimensional dislocation model for the San Fernando, California, earthquake of February 9, 1971 Bulletin of the Seismological Society of America, February 1, 1974; 64(1): 149 - 172. [Abstract] [PDF]
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W. L. Ellsworth, R. H. Campbell, D. P. Hill, R. A. Page, R. W. Alewine III, T. C. Hanks, T. H. Heaton, J. A. Hileman, H. Kanamori, B. Minster, et al. Point Mugu, California, Earthquake of 21 February 1973 and Its Aftershocks Science, December 14, 1973; 182(4117): 1127 - 1129. [Abstract] [PDF]
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G. F. MURRAY Dislocation mechanism--the Parkfield 1966 accelerograms Bulletin of the Seismological Society of America, October 1, 1973; 63(5): 1539 - 1555. [Abstract] [PDF]
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H. S. HASEGAWA Surface- and body-wave spectra of CANNIKIN and shallow Aleutian earthquakes Bulletin of the Seismological Society of America, August 1, 1973; 63(4): 1201 - 1225. [Abstract] [PDF]
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A. NIAZY Elastic displacements caused by a propagating crack in an infinite medium: An exact solution Bulletin of the Seismological Society of America, April 1, 1973; 63(2): 357 - 379. [Abstract] [PDF]
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T. MIKUMO Faulting process of the San Fernando earthquake of February 9, 1971 inferred from static and dynamic near-field displacements Bulletin of the Seismological Society of America, February 1, 1973; 63(1): 249 - 269. [Abstract] [PDF]
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F. T. WU, K. C. THOMSON, and H. KUENZLER Stick-slip propagation velocity and seismic source mechanism Bulletin of the Seismological Society of America, December 1, 1972; 62(6): 1621 - 1628. [Abstract] [PDF]
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M. D. TRIFUNAC Tectonic stress and the source mechanism of the Imperial Valley, California, earthquake of 1940 Bulletin of the Seismological Society of America, October 1, 1972; 62(5): 1283 - 1302. [Abstract] [PDF]
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N. A. HASKELL and K. C. THOMSON Elastodynamic near-field of a finite, propagating tensile fault Bulletin of the Seismological Society of America, June 1, 1972; 62(3): 675 - 697. [Abstract] [PDF]
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M. D. TRIFUNAC Stress estimates for the San Fernando, California, earthquake of February 9, 1971: Main event and thirteen aftershocks Bulletin of the Seismological Society of America, June 1, 1972; 62(3): 721 - 750. [Abstract] [PDF]
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T. C. HANKS and M. WYSS The use of body-wave spectra in the determination of seismic-source parameters Bulletin of the Seismological Society of America, April 1, 1972; 62(2): 561 - 589. [Abstract] [PDF]
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K. RYBICKI The elastic residual field of a very long strike-slip fault in the presence of a discontinuity Bulletin of the Seismological Society of America, February 1, 1971; 61(1): 79 - 92. [Abstract] [PDF]
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D. M. BOORE, K. AKI, and T. TODD A two-dimensional moving dislocation model for a strike-slip fault Bulletin of the Seismological Society of America, February 1, 1971; 61(1): 177 - 194. [Abstract] [PDF]
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K. AKI, P. REASENBERG, T. DEFAZIO, and Y.-B. TSAI Near-field and far-field seismic evidences for triggering of an earthquake by the Benham explosion Bulletin of the Seismological Society of America, December 1, 1969; 59(6): 2197 - 2207. [Abstract] [PDF]
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