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DIVISION OF GEOLOGICAL AND PLANETARY SCIENCES 170-25 CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91125
Abstract
Surficial slip along the entire mapped length of the Superstitition Hills fault in southern California occurred in association with the Superstition Hills earthquake (Ms 6.6) of 24 November 1987. We made repeated measurements of surface slip at 36 sites along the fault and occupied 64 sites at least once. At our sites, dextral slip was as high as 48.5 cm 1 day after the earthquake and 71 cm 2 months after. The measurements show that slip during the period from hr to several hundred hr following the event is described by a simple power law of time. Extrapolation to t = 1 min indicates that co-seismic slippage ranged from 5 to 23 cm at 10 of our best recorded sites, suggesting that finite co-seismic slippage occurred along the length of the fault. These extrapolations are supported by a measurement made at Imler Road 30 min after the shock.
Measurements are complete through October 1988. At many sites, the form of slip-rate was decay changed from power law to a function of log time during the interval between 300 and 500 hr after the earthquake. Logarithmic slip-rate decay in time was observed for a period of several yr after the Parkfield, Borrego Mountain, and Imperial Valley earthquakes. Those measurements may have begun too late to resolve power-law behavior at early times. If current logarithmic behavior of the Superstition Hills fault persists, right-lateral slippage will approach 90 cm 10 yr after the rupture.
Changes in the along-fault displacement profile correlate well with geometric features including a fault bend and a major fault step. Moreover, slip behavior appears to be correlated to the thickness of sedimentary cover along the fault. Also, the northern half of the fault is bounded by a large block of continental crystalline basement. The presence of this block may have contributed to the relatively uniform early slip behavior observed there.
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A. FRANKEL Comment on "Rupture process of the 1987 Superstition Hills earthquake from the inversion of strong-motion data" by Wald et al. Bulletin of the Seismological Society of America, June 1, 1992; 82(3): 1511 - 1518. [PDF]
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D. J. WALD, S. H. HARTZELL, and D. V. HELMBERGER Reply to Arthur Frankel's "Comment on 'Rupture process of the 1987 Superstition Hills earthquake from the inversion of strong-motion data'" Bulletin of the Seismological Society of America, June 1, 1992; 82(3): 1519 - 1533. [PDF]
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D. J. WALD, D. V. HELMBERGER, and S. H. HARTZELL Rupture process of the 1987 Superstition Hills earthquake from the inversion of strong-motion data Bulletin of the Seismological Society of America, October 1, 1990; 80(5): 1079 - 1098. [Abstract] [PDF]
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L. J. HWANG, H. MAGISTRALE, and H. KANAMORI Teleseismic source parameters and rupture characteristics of the 24 November 1987, Superstition Hills earthquake Bulletin of the Seismological Society of America, February 1, 1990; 80(1): 43 - 56. [Abstract] [PDF]
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T. C. HANKS and C. R. ALLEN The Elmore Ranch and Superstition Hills earthquakes of 24 November 1987: Introduction to the special issue Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 231 - 238. [PDF]
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R. V. SHARP, K. E. BUDDING, J. BOATWRIGHT, M. J. ADER, M. G. BONILLA, M. M. CLARK, T. E. FUMAL, K. K. HARMS, J. J. LIENKAEMPER, D. M. MORTON, et al. Surface faulting along the Superstition Hills fault zone and nearby faults associated with the earthquakes of 24 November 1987 Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 252 - 281. [Abstract] [PDF]
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K. HUDNUT, L. SEEBER, T. ROCKWELL, J. GOODMACHER, R. KLINGER, S. LINDVALL, and R. MCELWAIN Surface ruptures on cross-faults in the 24 November 1987 Superstition Hills, California, earthquake sequence Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 282 - 296. [Abstract] [PDF]
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K. W. HUDNUT and K. E. SIEH Behavior of the Superstition Hills fault during the past 330 years Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 304 - 329. [Abstract] [PDF]
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S. C. LINDVALL, T. K. ROCKWELL, and K. W. HUDNUT Evidence for prehistoric earthquakes on the Superstition Hills fault from offset geomorphic features Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 342 - 361. [Abstract] [PDF]
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S. F. MCGILL, C. R. ALLEN, K. W. HUDNUT, D. C. JOHNSON, W. F. MILLER, and K. E. SIEH Slip on the Superstition Hills fault and on nearby faults associated with the 24 November 1987 Elmore Ranch and Superstition Hills earthquakes, southern California Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 362 - 375. [Abstract] [PDF]
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J. BOATWRIGHT, K. E. BUDDING, and R. V. SHARP Inverting measurements of surface slip on the Superstition Hills fault Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 411 - 423. [Abstract] [PDF]
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R. BILHAM Surface slip subsequent to the 24 November 1987 Superstition Hills, California, earthquake monitored by digital creepmeters Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 424 - 450. [Abstract] [PDF]
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K. W. HUDNUT and M. M. CLARK New slip along parts of the 1968 Coyote Creek fault rupture, California Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 451 - 465. [Abstract] [PDF]
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D. C. AGNEW and F. K. WYATT The 1987 Superstition Hills earthquake sequence: Strains and tilts at Pinon Flat Observatory Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 480 - 492. [Abstract] [PDF]
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A. L. BENT, D. V. HELMBERGER, R. J. STEAD, and P. HO-LIU Waveform modeling of the November 1987 Superstition Hills earthquakes Bulletin of the Seismological Society of America, April 1, 1989; 79(2): 500 - 514. [Abstract] [PDF]
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