Fault activity of the Three Points and Pine Canyon segments, San Andreas fault zone, Los Angeles County, California [microform] : final technical report (annual technical report for fiscal year 1979-80 covering the period July 1, 1979 to June 30, 1980)

The San Andreas fault has the highest calculated time-dependent probability for large-magnitude earthquakes in southern California. However, where the fault is multistranded east of the Los Angeles metropolitan area, it has been uncertain which strand has the fastest slip rate and, therefore, which has the highest probability of a destructive earthquake. Reconstruction of offset Pleistocene-Holocene landforms dated using the uranium-thorium soil carbonate and beryllium-10 surface exposure techniques indicates slip rates of 24.1 ± 3 millimeter per year for the San Andreas fault, with 21.6 ± 2 and 2.5 ± 1 millimeters per year for the Mission Creek and Banning strands, respectively. These data establish the Mission Creek strand as the primary fault bounding the Pacific and North American plates at this latitude and imply that 6 to 9 meters of elastic strain has accumulated along the fault since the most recent surface-rupturing earthquake, highlighting the potential for large earthquakes along this strand.

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Water-level fluctuations and earthquakes on the San Andreas fault zone

Geology ◽

10.1130/0091-7613(1975)3<437:wfaeot>2.0.co;2 ◽

1975 ◽

Vol 3 (8) ◽

pp. 437 ◽

Cited By ~ 25

Author(s):

Robert L. Kovach ◽

Amos Nur ◽

Robert L. Wesson ◽

Russell Robinson

Keyword(s):

Water Level ◽

Fault Zone ◽

San Andreas Fault ◽

Water Level Fluctuations ◽

San Andreas

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Automatic identification of fault zone head waves and directPwaves and its application in the Parkfield section of the San Andreas Fault, California

Geophysical Journal International ◽

10.1093/gji/ggw082 ◽

2016 ◽

Vol 205 (3) ◽

pp. 1326-1341 ◽

Cited By ~ 3

Author(s):

Zefeng Li ◽

Zhigang Peng

Keyword(s):

Fault Zone ◽

San Andreas Fault ◽

Automatic Identification ◽

San Andreas ◽

Head Waves

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Interpretation of seismic reflection profiling data for the structure of the San Andreas fault zone

Bulletin of the Seismological Society of America ◽

10.1785/bssa07306a1701 ◽

1983 ◽

Vol 73 (6A) ◽

pp. 1701-1720

Author(s):

R. Feng ◽

T. V. McEvilly

Keyword(s):

Fault Zone ◽

Seismic Reflection ◽

San Andreas Fault ◽

Velocity Model ◽

Seismic Reflection Profile ◽

Lateral Velocity ◽

Zone Structure ◽

Ray Method ◽

Velocity Change ◽

San Andreas

Abstract A seismic reflection profile crossing the San Andreas fault zone in central California was conducted in 1978. Results are complicated by the extreme lateral heterogeneity and low velocities in the fault zone. Other evidence for severe lateral velocity change across the fault zone lies in hypocenter bias and nodal plane distortion for earthquakes on the fault. Conventional interpretation and processing methods for reflection data are hard-pressed in this situation. Using the inverse ray method of May and Covey (1981), with an initial model derived from a variety of data and the impedance contrasts inferred from the preserved amplitude stacked section, an iterative inversion process yields a velocity model which, while clearly nonunique, is consistent with the various lines of evidence on the fault zone structure.

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