| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
NATIONAL CENTER FOR EARTHQUAKE RESEARCH U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA 94025
Abstract
The earthquake sequence of late February and March 1972 involved movement along the San Andreas fault and within the crustal wedge enclosed by the branching San Andreas and San Benito faults near Bear Valley, San Benito County, California. Activity was mainly confined to three distinct zones of strike-slip faulting: the short north-trending aftershock zone of the M 3.5 earthquake of February 22, 1972, the aftershock zone of the M 5.0 Bear Valley earthquake of February 24, 1972 located along the San Andreas fault, and the west-trending aftershock zone of the M 4.6 earthquake of February 27, 1972. The north-trending and west-trending zones lie between the two major splays of the branching fault system. Focal mechanism solutions from events in these zones are consistent with the transfer of horizontal, dextral displacement from the San Andreas fault to the San Benito, Paicines and Calaveras faults within the Bear Valley region. During the 18 months preceding the February 1972 sequence, the hypocentral regions of both the M 5.0 and M 4.6 shocks were characterized by concentrations of small earthquakes. Aftershock source areas of these two events progressively expanded during the course of the aftershock sequence. Estimates of the mainshock rupture surface for these events based on the distribution of aftershocks range over a factor of 4 owing to the irregular distribution of aftershocks and the rapid growth of the aftershock zone.
Footnotes
* Present address: Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.
This article has been cited by other articles:
|
|
 |
|
  Y.-G. Li, W. L. Ellsworth, C. H. Thurber, P. E. Malin, and K. Aki Fault-zone guided waves from explosions in the San Andreas fault at Parkfield and Cienega Valley, California Bulletin of the Seismological Society of America, February 1, 1997; 87(1): 210 - 221. [Abstract] [PDF]
|
|
|
|
 |
|
 M. D. Zoback, M. D. ZOBACK, M. L. ZOBACK, V. S. MOUNT, J. SUPPE, J. P. EATON, J. H. HEALY, D. OPPENHEIMER, P. REASENBERG, L. JONES, et al. New Evidence on the State of Stress of the San Andreas Fault System Science, November 20, 1987; 238(4830): 1105 - 1111. [Abstract] [PDF]
|
|
|
|
|
|
Y. Y. Kagan, Y. Y. KAGAN, and L. KNOPOFF Statistical Short-Term Earthquake Prediction Science, June 19, 1987; 236(4808): 1563 - 1567. [Abstract] [PDF]
|
|
|
|
|
|
S. MATSUMURA A one-parameter expression of seismicity patterns in space and time Bulletin of the Seismological Society of America, December 1, 1984; 74(6): 2559 - 2576. [Abstract] [PDF]
|
|
|
|
|
|
R. FENG and T. V. MCEVILLY Interpretation of seismic reflection profiling data for the structure of the San Andreas fault zone Bulletin of the Seismological Society of America, December 1, 1983; 73(6A): 1701 - 1720. [Abstract] [PDF]
|
|
|
|
 |
|
 R. H. Sibson Continental fault structure and the shallow earthquake source Journal of the Geological Society, October 1, 1983; 140(5): 741 - 767. [Abstract] [PDF]
|
|
|
|
|
|
R. B. HERRMANN, C. A. LANGSTON, and J. E. ZOLLWEG The Sharpsburg, Kentucky, earthquake of 27 July 1980 Bulletin of the Seismological Society of America, August 1, 1982; 72(4): 1219 - 1239. [Abstract] [PDF]
|
|
|
|
|
|
W. B. JOYNER and D. M. BOORE Peak horizontal acceleration and velocity from strong-motion records including records from the 1979 imperial valley, California, earthquake Bulletin of the Seismological Society of America, December 1, 1981; 71(6): 2011 - 2038. [Abstract] [PDF]
|
|
|
|
|
|
M. LISOWSKI and W. H. PRESCOTT Short-range distance measurements along the San Andreas fault system in central California, 1975 to 1979 Bulletin of the Seismological Society of America, October 1, 1981; 71(5): 1607 - 1624. [Abstract] [PDF]
|
|
|
|
|
|
C. D. STEPHENS, J. C. LAHR, K. A. FOGLEMAN, and R. B. HORNER The St. Elias, Alaska, earthquake of February 28, 1979: Regional recording of aftershocks and short-term, pre-earthquake seismicity Bulletin of the Seismological Society of America, October 1, 1980; 70(5): 1607 - 1633. [Abstract] [PDF]
|
|
|
|
|
|
C. KISSLINGER Evaluation of S to P amplitude rations for determining focal mechanisms from regional network observations Bulletin of the Seismological Society of America, August 1, 1980; 70(4): 999 - 1014. [Abstract] [PDF]
|
|
|
|
|
|
W. H. BAKUN Seismic activity on the southern Calaveras Fault in central California Bulletin of the Seismological Society of America, August 1, 1980; 70(4): 1181 - 1197. [Abstract] [PDF]
|
|
|
|
|
|
R. O. BURFORD and P. W. HARSH Slip on the San Andreas fault in central California from alinement array surveys Bulletin of the Seismological Society of America, August 1, 1980; 70(4): 1233 - 1261. [Abstract] [PDF]
|
|
|
|
|
|
W. H. BAKUN, R. M. STEWART, C. G. BUFE, and S. M. MARKS Implication of seismicity for failure of a section of the San Andreas Fault Bulletin of the Seismological Society of America, February 1, 1980; 70(1): 185 - 201. [Abstract] [PDF]
|
|
|
|
|
|
L. GEDNEY, S. ESTES, and N. BISWAS Earthquake migration in the Fairbanks, Alaska seismic zone Bulletin of the Seismological Society of America, February 1, 1980; 70(1): 223 - 241. [Abstract] [PDF]
|
|
|
|
|
|
P. W. HARSH and N. PAVONI Slip on the Paicines fault Bulletin of the Seismological Society of America, August 1, 1978; 68(4): 1191 - 1193. [PDF]
|
|
|
|
|
|
A. G. LINDH, D. A. LOCKNER, and W. H. K. LEE Velocity anomalies: An alternative explanation Bulletin of the Seismological Society of America, June 1, 1978; 68(3): 721 - 734. [Abstract] [PDF]
|
|
|
|
|
|
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]
|
|
|
|
|
|
J. A. STEPPE, W. H. BAKUN, and C. G. BUFE Temporal stability of P-velocity anisotropy before earthquakes in central California Bulletin of the Seismological Society of America, August 1, 1977; 67(4): 1075 - 1090. [Abstract] [PDF]
|
|
|
|
|
|
D. J. STIERMAN and W. L. ELLSWORTH Aftershocks of the February 21, 1973 Point Mugu, California earthquake Bulletin of the Seismological Society of America, December 1, 1976; 66(6): 1931 - 1952. [Abstract] [PDF]
|
|
|
|
|
|
R. ROBINSON and H. M. IYER Temporal and spatial variations of travel-time residuals in central California for Novaya Zemlya events Bulletin of the Seismological Society of America, October 1, 1976; 66(5): 1733 - 1747. [Abstract] [PDF]
|
|
|
|
|
|
C. H. CRAMER Teleseismic residuals prior to the November 28, 1974, Thanksgiving Day earthquake near Hollister, California Bulletin of the Seismological Society of America, August 1, 1976; 66(4): 1233 - 1248. [Abstract] [PDF]
|
|
|
|
|
|
W. H. BAKUN and C. G. BUFE Shear-wave attenuation along the San Andreas fault zone in central California Bulletin of the Seismological Society of America, April 1, 1975; 65(2): 439 - 459. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
