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SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91125
DIVISION OF GEOLOGICAL AND PLANETARY SCIENCES
Abstract
A data set of 41 moderate and large earthquakes has been used to derive scaling rules for kinematic fault parameters. If effective stress and static stress drop are equal, then fault rise time, 
, and fault area, S, are related by = 16S1/2/(7
3/2ß), where ß is shear velocity. Fault length (parallel to strike) and width (parallel to dip) are empirically related by L=2W. Scatter for both scaling rules is about a factor of two. These scaling laws combine to give width and rise time in terms of fault length. Length is then used as the sole free parameter in a Haskell type fault model to derive scaling laws relating seismic moment to MS (20-sec surface-wave magnitude), MS to S and mb (1-sec body-wave magnitude) to MS. Observed data agree well with the predicted scaling relation. The "source spectrum" depends on both azimuth and apparent velocity of the phase or mode, so there is a different "source spectrum" for each mode, rather than a single spectrum for all modes. Furthermore, fault width (i.e., the two dimensionality of faults) must not be neglected. Inclusion of width leads to different average source spectra for surface waves and body waves. These spectra in turn imply that mb and MS reach maximum values regardless of further increases in L and seismic moment. The mb versus MS relation from this study differs significantly from the Gutenberg-Richter (G-R) relation, because the G-R equation was derived for body waves with a predominant period of about 5 sec and thus does not apply to modern 1-sec mb determinations. Previous investigators who assumed that the G-R relation was derived from 1-sec data were in error. Finally, averaging reported rupture velocities yields the relation vR = 0.72ß.
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H. K. ACHARYA Regional variations in the rupture-length magnitude relationships and their dynamical significance Bulletin of the Seismological Society of America, December 1, 1979; 69(6): 2063 - 2084. [Abstract] [PDF]
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R. C. QUITTMEYER and K. H. JACOB Historical and modern seismicity of Pakistan, Afghanistan, northwestern India, and southeastern Iran Bulletin of the Seismological Society of America, June 1, 1979; 69(3): 773 - 823. [Abstract] [PDF]
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B. R. WILLIAMS Mo calculations from a generalized AR parameter method for WWSSN instruments Bulletin of the Seismological Society of America, April 1, 1979; 69(2): 329 - 351. [Abstract] [PDF]
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R. B. HERRMANN, S.-H. CHENG, and O. W. NUTTLI Archeoseismology applied to the New Madrid earthquakes of 1811 to 1812 Bulletin of the Seismological Society of America, December 1, 1978; 68(6): 1751 - 1759. [Abstract] [PDF]
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J. E. EBEL, L. J. BURDICK, and G. S. STEWART The source mechanism of the August 7, 1966 El Golfo earthquake Bulletin of the Seismological Society of America, October 1, 1978; 68(5): 1281 - 1292. [Abstract] [PDF]
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R. DOBRY, I. M. IDRISS, and E. NG Duration characteristics of horizontal components of strong-motion earthquake records Bulletin of the Seismological Society of America, October 1, 1978; 68(5): 1487 - 1520. [Abstract] [PDF]
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R. MADARIAGA The dynamic field of Haskell's rectangular dislocation fault model Bulletin of the Seismological Society of America, August 1, 1978; 68(4): 869 - 887. [Abstract] [PDF]
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C. W. FRASIER and R. G. NORTH Evidence for {omega}-cube scaling from amplitudes and periods of the Rat Island sequence (1965) Bulletin of the Seismological Society of America, April 1, 1978; 68(2): 265 - 282. [Abstract] [PDF]
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D. M. BOORE and W. B. JOYNER The influence of rupture incoherence on seismic directivity Bulletin of the Seismological Society of America, April 1, 1978; 68(2): 283 - 300. [Abstract] [PDF]
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S. H. HARTZELL, G. A. FRAZIER, and J. N. BRUNE Earthquake modeling in a homogeneous half-space Bulletin of the Seismological Society of America, April 1, 1978; 68(2): 301 - 316. [Abstract] [PDF]
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R. J. GELLER and H. KANAMORI Magnitudes of great shallow earthquakes from 1904 to 1952 Bulletin of the Seismological Society of America, June 1, 1977; 67(3): 587 - 598. [Abstract] [PDF]
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