|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
SEISMOGRAPHIC STATION DEPARTMENT OF GEOLOGY AND GEOPHYSICS UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720
Abstract
This is a study of source characteristics of 13 earthquakes with magnitudes between 2.4 and 5.1 located near the San Andreas fault in central California. On the basis of hypocentral locations and fault-plane solutions the earthquakes separate into two source groups, one group clearly related to the throughgoing northwest-trending San Andreas fault zone and the other apparently associated with generally north-trending bifurcations such as the Calaveras fault. The basic data consist of broad-band recordings (0.03 to 10 Hz) of these earthquakes at two sites of the San Andreas Geophysical Observatory (SAGO). Epicentral distances range between 2 and 40 km, and maximum ground displacements from 4 to 4000 microns were recorded. The whole-record spectra computed from the seismograms lend themselves to source parameter studies in that they can be interpreted in terms of low-frequency level, corner frequency, and high-frequency slope. Synthetic seismograms have also been used to estimate source parameters in both the time domain and frequency domain, and the results compare favorably with those estimated directly from the spectra. The influences of tilts and nonlinear response of the seismometer were considered in the interpretation of the low frequencies. Seismic source moments estimated from the low-frequency levels of the spectra show a linear dependence on magnitude with a slope slightly greater than 1. The geology at the recording site can contribute an uncertainty factor of at least 3 to the estimated moments. Observed corner frequencies are only weakly dependent on magnitude. Interpreted in terms of source dimension, these corner frequencies imply values of 1 to 2 km for the earthquakes of this study. The corner frequencies may also be interpreted in terms of the rise time source function, yielding values in the range 0.5 to 1.0 sec. The data indicate that the earthquakes of this study are all surprisingly similar in their fundamental source parameters, with only the seismic moment showing a strong dependence on magnitude.
This article has been cited by other articles:
|
|
 |
|
  R. M. Nadeau and L. R. Johnson Seismological studies at Parkfield VI: Moment release rates and estimates of source parameters for small repeating earthquakes Bulletin of the Seismological Society of America, June 1, 1998; 88(3): 790 - 814. [Abstract] [PDF]
|
|
|
|
|
|
B. B. WOODS, S. KEDAR, and D. V. HELMBERGER ML:M0 as a regional seismic discriminant Bulletin of the Seismological Society of America, August 1, 1993; 83(4): 1167 - 1183. [Abstract] [PDF]
|
|
|
|
|
|
A. VIDAL and L. MUNGUIA Local magnitude and source parameters for earthquakes in the Peninsular Ranges of Baja California, Mexico Bulletin of the Seismological Society of America, December 1, 1991; 81(6): 2254 - 2267. [Abstract] [PDF]
|
|
|
|
|
|
P. G. SOMERVILLE, J. P. MCLAREN, L. V. LEFEVRE, R. W. BURGER, and D. V. HELMBERGER Comparison of source scaling relations of eastern and western North American earthquakes Bulletin of the Seismological Society of America, April 1, 1987; 77(2): 322 - 346. [Abstract] [PDF]
|
|
|
|
|
|
W. B. JOYNER A scaling law for the spectra of large earthquakes Bulletin of the Seismological Society of America, August 1, 1984; 74(4): 1167 - 1188. [Abstract] [PDF]
|
|
|
|
|
|
H. S. HASEGAWA Lg spectra of local earthquakes recorded by the Eastern Canada Telemetered Network and spectral scaling Bulletin of the Seismological Society of America, August 1, 1983; 73(4): 1041 - 1061. [Abstract] [PDF]
|
|
|
|
|
|
B. A. BOLT and M. HERRAIZ Simplified estimation of seismic moment from seismograms Bulletin of the Seismological Society of America, June 1, 1983; 73(3): 735 - 748. [Abstract] [PDF]
|
|
|
|
|
|
M. CAMPILLO and M. BOUCHON A theoretical study of the radiation from small strikeslip earthquakes at close distances Bulletin of the Seismological Society of America, February 1, 1983; 73(1): 83 - 96. [Abstract] [PDF]
|
|
|
|
|
|
A. MCGARR Upper bounds on near-source peak ground motion based on a model of inhomogeneous faulting Bulletin of the Seismological Society of America, December 1, 1982; 72(6A): 1825 - 1841. [Abstract] [PDF]
|
|
|
|
|
|
T. MODIANO and D. HATZFELD Experimental study of the spectral content for shallow earthquakes Bulletin of the Seismological Society of America, October 1, 1982; 72(5): 1739 - 1758. [Abstract] [PDF]
|
|
|
|
|
|
F. E. FOLLOWILL, J. M. Mills Jr., and R. F. ROHRER A comparison of magnitudes and moments for 26 Livermore Valley microearthquakes Bulletin of the Seismological Society of America, June 1, 1982; 72(3): 1025 - 1031. [PDF]
|
|
|
|
|
|
R. W. CLYMER and T. V. MCEVILLY Travel-time monitoring with vibroseis Bulletin of the Seismological Society of America, December 1, 1981; 71(6): 1903 - 1927. [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]
|
|
|
|
|
|
A. MCGARR, R. W. E. GREEN, and S. M. SPOTTISWOODE Strong ground motion of mine tremors: Some implications for near-source ground motion parameters Bulletin of the Seismological Society of America, February 1, 1981; 71(1): 295 - 319. [Abstract] [PDF]
|
|
|
|
|
|
M. R. SOMERVILLE, W. A. PEPPIN, and J. D. VANWORMER An earthquake sequence in the Sierra Nevada-Great Basin boundary zone: Diamond valley Bulletin of the Seismological Society of America, October 1, 1980; 70(5): 1547 - 1555. [Abstract] [PDF]
|
|
|
|
|
|
G. E. MARION and L. T. LONG Microearthquake spectra in the southeastern United States Bulletin of the Seismological Society of America, August 1, 1980; 70(4): 1037 - 1054. [Abstract] [PDF]
|
|
|
|
|
|
R. B. HERRMANN Q estimates using the coda of local earthquake Bulletin of the Seismological Society of America, April 1, 1980; 70(2): 447 - 468. [Abstract] [PDF]
|
|
|
|
|
|
D. M. HADLEY and D. V. HELMBERGER Simulation of strong ground motions Bulletin of the Seismological Society of America, April 1, 1980; 70(2): 617 - 630. [Abstract] [PDF]
|
|
|
|
|
|
W. A. PEPPIN and C. G. BUFE Induced versus natural earthquakes: Search for a seismic discriminant Bulletin of the Seismological Society of America, February 1, 1980; 70(1): 269 - 281. [Abstract] [PDF]
|
|
|
|
|
|
W. H. BAKUN and T. V. MCEVILLY Are foreshocks distinctive? Evidence from the 1966 Parkfield and the 1975 Oroville, California sequences Bulletin of the Seismological Society of America, August 1, 1979; 69(4): 1027 - 1038. [Abstract] [PDF]
|
|
|
|
|
|
A. M. SUTEAU and J. H. WHITCOMB A local earthquake coda magnitude and its relation to duration, moment Mo, and local Richter magnitude ML Bulletin of the Seismological Society of America, April 1, 1979; 69(2): 353 - 368. [Abstract] [PDF]
|
|
|
|
|
|
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]
|
|
|
|
|
|
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]
|
|
|
|
|
|
B. CHOUET, K. AKI, and M. TSUJIURA Regional variation of the scaling law of earthquake source spectra Bulletin of the Seismological Society of America, February 1, 1978; 68(1): 49 - 79. [Abstract] [PDF]
|
|
|
|
|
|
B. W. STUMP and L. R. JOHNSON The determination of source properties by the linear inversion of seismograms Bulletin of the Seismological Society of America, December 1, 1977; 67(6): 1489 - 1502. [Abstract] [PDF]
|
|
|
|
|
|
M. ISRAEL and R. L. KOVACH Near-field motions from a propagating strike-slip fault in an elastic half-space Bulletin of the Seismological Society of America, August 1, 1977; 67(4): 977 - 994. [Abstract] [PDF]
|
|
|
|
|
|
M. ISRAEL and M. VERED Near-field source parameters by finite-source theoretical seismograms Bulletin of the Seismological Society of America, June 1, 1977; 67(3): 631 - 640. [Abstract] [PDF]
|
|
|
|
|
|
D. V. HELMBERGER and L. R. JOHNSON Source parameters of moderate size earthquakes and the importance of receiver crustal structure in interpreting observations of local earthquakes Bulletin of the Seismological Society of America, April 1, 1977; 67(2): 301 - 313. [Abstract] [PDF]
|
|
|
|
|
|
A. BEN-MENAHEM The role of the shear mach number in earthquake source dynamics Bulletin of the Seismological Society of America, December 1, 1976; 66(6): 1787 - 1799. [Abstract] [PDF]
|
|
|
|
|
|
W. A. PEPPIN P-wave spectra of nevada test site events at near and very near distances: Implications for a near-regional body wave-surface wave discriminant Bulletin of the Seismological Society of America, June 1, 1976; 66(3): 803 - 825. [Abstract] [PDF]
|
|
|
|
|
|
W. H. BAKUN, C. G. BUFE, and R. M. STEWART Body-wave spectra of central California earthquakes Bulletin of the Seismological Society of America, April 1, 1976; 66(2): 363 - 384. [Abstract] [PDF]
|
|
|
|
|
|
D. M. BOORE, A. G. LINDH, T. V. MCEVILLY, and W. W. TOLMACHOFF A search for travel-time changes associated with the Parkfield, California, earthquake of 1966 Bulletin of the Seismological Society of America, October 1, 1975; 65(5): 1407 - 1418. [Abstract] [PDF]
|
|
|
|
|
|
J. F. EVERNDEN Further studies on seismic discrimination Bulletin of the Seismological Society of America, April 1, 1975; 65(2): 359 - 391. [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]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
