scholarly journals Isotropic source terms of San Jacinto fault zone earthquakes based on waveform inversions with a generalized CAP method

2015 ◽  
Vol 200 (2) ◽  
pp. 1269-1280 ◽  
Author(s):  
Z. E. Ross ◽  
Y. Ben-Zion ◽  
L. Zhu
Keyword(s):  
Fault Zone ◽  
Source Terms ◽  
Isotropic Source ◽  
San Jacinto Fault ◽  
San Jacinto Fault Zone ◽  
Cap Method

scholarly journals Basic data features and results from a spatially dense seismic array on the San Jacinto fault zone

2015 ◽  
Vol 202 (1) ◽  
pp. 370-380 ◽  
Author(s):  
Yehuda Ben-Zion ◽  
Frank L. Vernon ◽  
Yaman Ozakin ◽  
Dimitri Zigone ◽  
Zachary E. Ross ◽  
...  
Keyword(s):  
Fault Zone ◽  
Seismic Array ◽  
Basic Data ◽  
San Jacinto Fault ◽  
San Jacinto Fault Zone ◽  
Dense Seismic Array

A re-examination of historic earthquakes in the San Jacinto fault zone, California

1991 ◽  
Vol 81 (6) ◽  
pp. 2289-2309
Author(s):  
Allison L. Bent ◽  
Donald V. Helmberger
Keyword(s):  
Fault Zone ◽  
Source Parameters ◽  
Travel Times ◽  
Considerable Uncertainty ◽  
San Jacinto Fault ◽  
San Jacinto Fault Zone ◽  
Moment Estimates ◽  
The Moment ◽  
Recent Earthquakes ◽  
Historic Earthquakes

Abstract The high level of seismic activity and the potential for large earthquakes in the San Jacinto fault zone, southern California, make it desirable to have accurate locations and source parameters for as many previous events as possible. Prior to the installation of a dense seismic network in this region, earthquakes were located using only a few stations with generally poor azimuthal coverage resulting in considerable uncertainty in the locations. We relocate and obtain moment estimates for historic (pre-WWSSN) earthquakes in the western Imperial Valley by comparing the waveforms and travel times with recent earthquakes in the region. All the events are in the ML 5.5 to 6.5 range. The historic earthquakes of interest occurred in 1937, 1942, and 1954. We use the 1968 Borrego Mountain, 1969 Coyote Mountain, and 1987 Elmore Ranch earthquakes as calibration events. We employ regional and teleseismic data from continuously operating stations, with Pasadena, DeBilt, Berkeley, Ottawa, and St. Louis recording most of the events. The waveforms imply that all the events are almost pure strike-slip events on vertical or near-vertical faults. Approximate values for the strikes were obtained and are within the range of observed strikes for well-studied earthquakes in this region. The earthquakes are relocated by comparing S-P and surface-wave - S travel times of historic events with the presumably well-located recent events. The relocations require only a small change in location for the 1954 event and a larger adjustment in the 1942 epicenter. It also appears that the 1969 earthquake may have been mislocated. The moment estimates are obtained by direct comparison of the maximum amplitudes. The moment estimates imply that the 1968 and not the 1942 earthquake is the largest to have occurred in the region this century. Previous magnitude estimates suggested the 1942 event was larger.

Structural Properties of the San Jacinto Fault Zone at Blackburn Saddle from Seismic Data of a Dense Linear Array

2018 ◽  
Vol 176 (3) ◽  
pp. 1169-1191 ◽  
Author(s):  
Pieter-Ewald Share ◽  
Amir A. Allam ◽  
Yehuda Ben-Zion ◽  
Fan-Chi Lin ◽  
Frank L. Vernon
Keyword(s):  
Structural Properties ◽  
Fault Zone ◽  
Seismic Data ◽  
Linear Array ◽  
San Jacinto Fault ◽  
San Jacinto Fault Zone
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