|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
LAMONT-DOHERTY GEOLOGICAL OBSERVATORY COLUMBIA UNIVERSITY, PALISADES, NEW YORK, 10964
INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS AND SCRIPPS INSTITUTE OF OCEANOGRAPHY UNIVERSITY OF CALIFORNIA, SAN DIEGO, CALIFORNIA
DIVISION OF GEOLOGICAL SCIENCES CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA
Abstract
The ratio of short- to long-period amplitude is expressed in terms of apparent stress, rigidity times energy over moment (µEG/M0), for 277 earthquakes in California. A map showing the apparent stresses is compiled. In general, the Mendocino and San Andreas faults as well as the Gulf of California area are regions of large surface-wave excitation and little short-period radiation (low apparent stress). Away from the main fault zones, the apparent stresses tend to be higher. Regions of conspicuously low surface-wave excitation (high apparent stress) are the Laguna Salada-Sierra Juarez region in northern Baja California, the California-Nevada border region north of Bishop, and the region associated with the bend of the San Andreas between San Bernardino and San Gorgonio Mountain. A detailed comparison of earthquakes with accurately-known depths at Parkfield and Borrego Mountain indicates two important differences in apparent stresses between these two source regions. The apparent stress at all depths is larger at Borrego Mountain than at Parkfield, and it increases with depth at Borrego Mountain, whereas it remains constant at all depths at Parkfield. The explanation for the variation of surface-wave excitation (apparent stress) is not known for certain, but it could be related to variations in true stress.
This article has been cited by other articles:
|
|
 |
|
  A. Jin and E. Fukuyama Seismic Energy for Shallow Earthquakes in Southwest Japan Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1314 - 1333. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Radiated Energy from the 16 October 1999 Hector Mine Earthquake: Regional and Teleseismic Estimates Bulletin of the Seismological Society of America, May 1, 2002; 92(4): 1256 - 1265.
|
|
|
|
|
|
F. R. ZUNIGA, M. WYSS, and M. E. WILSON Apparent stresses, stress drops, and amplitude ratios of earthquakes preceding and following the 1975 Hawaii MS = 7.2 main shock Bulletin of the Seismological Society of America, February 1, 1987; 77(1): 69 - 96. [Abstract] [PDF]
|
|
|
|
|
|
W. H. BAKUN and M. MCLAREN Microearthquakes and the nature of the creeping-to-locked transition of the San Andreas fault zone near San Juan Bautista, California Bulletin of the Seismological Society of America, February 1, 1984; 74(1): 235 - 254. [Abstract] [PDF]
|
|
|
|
|
|
K. W. CAMPBELL Bayesian analysis of extreme earthquake occurrences. Part II. Application to the San Jacinto fault zone of southern California Bulletin of the Seismological Society of America, August 1, 1983; 73(4): 1099 - 1115. [Abstract] [PDF]
|
|
|
|
|
|
J. B. FLETCHER Spectra from high-dynamic range digital recordings of Oroville, California aftershocks and their source parameters Bulletin of the Seismological Society of America, June 1, 1980; 70(3): 735 - 755. [Abstract] [PDF]
|
|
|
|
|
|
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]
|
|
|
|
|
|
T. G. RAUTIAN, V. I. KHALTURIN, V. G. MARTYNOV, and P. MOLNAR Preliminary analysis of the spectral content of P and S waves from local earthquakes in the Garm, Tadjikistan region Bulletin of the Seismological Society of America, August 1, 1978; 68(4): 949 - 971. [Abstract] [PDF]
|
|
|
|
|
|
S. J. GIBOWICZ Variation of source properties: The Inangahua, New Zealand, aftershocks of 1968 Bulletin of the Seismological Society of America, February 1, 1975; 65(1): 261 - 276. [Abstract] [PDF]
|
|
|
|
 |
|
 M. J. S. Johnston, M. J. S. Johnston, and C. E. Mortensen Tilt Precursors before Earthquakes on the San Andreas Fault, California Science, December 13, 1974; 186(4168): 1031 - 1034. [Abstract] [PDF]
|
|
|
|
|
|
D. HADLEY and J. COMBS Microearthquake distribution and mechanisms of faulting in the Fontana-San Bernardino area of Southern California Bulletin of the Seismological Society of America, October 1, 1974; 64(5): 1477 - 1499. [Abstract] [PDF]
|
|
|
|
|
|
J. N. BRUNE Earthquake modeling by stick-slip along precut surfaces in stressed foam rubber Bulletin of the Seismological Society of America, December 1, 1973; 63(6-1): 2105 - 2119. [Abstract] [PDF]
|
|
|
|
|
|
S. J. GIBOWICZ Stress drop and aftershocks Bulletin of the Seismological Society of America, August 1, 1973; 63(4): 1433 - 1446. [Abstract] [PDF]
|
|
|
|
|
|
A. A. NOWROOZI Seismicity of the mendocino escarpment and the aftershock sequence of June 26, 1968: Ocean bottom seismic measurements Bulletin of the Seismological Society of America, April 1, 1973; 63(2): 441 - 456. [Abstract] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
