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U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025
Abstract
Surface ruptures formed along a 10.4-km segment of the Brawley fault during the earthquake swarm of January and February, 1975, in central Imperial Valley, California. This newly recognized fault appears to branch northward from the Imperial fault about 8 km east-northeast of El Centro. Displacement at the surface was apparently vertical and reached a maximum of probably more than 0.2 m at Keystone Road. En echelon cracking suggested an incipient right-lateral component, but roads and irrigation canals were not laterally offset by the faulting. Surface cracks and most of the displacement probably developed suddenly at the time of the largest shock (M 4.7) in the swarm on January 23. At Harris Road, vertical movement continued at least until March 24, but significant afterslip across the fault zone may have ceased by February 13. Vertical movement after the 13th apparently took the form of a relative subsidence centered on the fault with no important net slip across the fault. Pre-1975 historic displacements on the Brawley fault occurred in 1940 at the time of the M 7.1 Imperial Valley earthquake and probably as intermittent creep between 1940 and 1975.
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  A. J. Meltzner, T. K. Rockwell, and L. A. Owen Recent and Long-Term Behavior of the Brawley Fault Zone, Imperial Valley, California: An Escalation in Slip Rate? Bulletin of the Seismological Society of America, December 1, 2006; 96(6): 2304 - 2328. [Abstract] [Full Text] [PDF]
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S. HARTZELL and D. V. HELMBERGER Strong-motion modeling of the Imperial Valley earthquake of 1979 Bulletin of the Seismological Society of America, April 1, 1982; 72(2): 571 - 596. [Abstract] [PDF]
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B. GILPIN and T.-C. LEE A microearthquake study in the Salton Sea geothermal area, California Bulletin of the Seismological Society of America, April 1, 1978; 68(2): 441 - 450. [Abstract] [PDF]
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N. R. GOULTY, R. O. BURFORD, C. R. ALLEN, R. GILMAN, C. E. JOHNSON, and R. P. KELLER Large creep events on the Imperial fault, California Bulletin of the Seismological Society of America, April 1, 1978; 68(2): 517 - 521. [PDF]
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T. H. Heaton, T. H. HEATON, and D. V. HELMBERGER Predictability of strong ground motion in the Imperial Valley: Modeling the M4.9, November 4, 1976 Brawley earthquake Bulletin of the Seismological Society of America, February 1, 1978; 68(1): 31 - 48. [Abstract] [PDF]
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C. E. JOHNSON and D. M. HADLEY Tectonic implications of the Brawley earthquake swarm, Imperial Valley, California, January 1975 Bulletin of the Seismological Society of America, August 1, 1976; 66(4): 1133 - 1144. [Abstract] [PDF]
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D. A. JOHNSON and T. C. HANKS Strong-motion earthquake accelerograms at Brawley, California: January 25, 1975 Bulletin of the Seismological Society of America, August 1, 1976; 66(4): 1155 - 1158. [Abstract] [PDF]
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D. P. HILL, F. G. FISCHER, K. M. LAHR, and J. M. COAKLEY Earthquake sounds generated by body-wave ground motion Bulletin of the Seismological Society of America, August 1, 1976; 66(4): 1159 - 1172. [Abstract] [PDF]
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