Abstract
Fault movement on the San Andreas system has been observed to vary in time and place. Variations in movement with time at a particular place along the fault have been shown to often precede earthquakes of magnitude 4.5–5.5. Where the fault moves regularly, the variations consist of the fault sticking until several centimeters of strain are stored. The amount of strain stored and released corresponds reasonably well with other observations of magnitude vs. strain. Where the fault has not moved regularly during the past ten years, evidence from several types of surveys indicate general compression of the area. Compression events of about six months duration and of about 10–15 cm over about 20 km have been observed to precede earthquakes in these areas.
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References
Hoffman, R. B.: 1968, California Department of Water Resources, Bulletin No. 116-6, ‘Geodimeter Fault Measurements in California’.
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© 1970 D. Reidel Publishing Company, Dordrecht, Holland
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Hofmann, R.B. (1970). Earthquake Predictions from Fault Movement and Strain Precursors in California. In: Mansinha, L., Smylie, D.E., Beck, A.E. (eds) Earthquake Displacement Fields and the Rotation of the Earth. Astrophysics and Space Science Library, vol 20. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3308-4_23
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DOI: https://doi.org/10.1007/978-94-010-3308-4_23
Publisher Name: Springer, Dordrecht
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