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The nature of surface tilt along 85 km of the San Andreas fault-preliminary results form a 14-instrument array

Pure and Applied Geophysics PAGEOPH

By:
,
DOI: 10.1007/BF01592914

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Abstract

The continuous monitoring of surface deformation near active faults is clearly necessary for an understanding of elastic strain accumulation and elastic and anelastic strain release associated with earthquakes. Fourteen 2-component tiltmeters have been installed in shallow boreholes along 85 km of the currently most active section of the San Andreas fault in the western United States. These instruments operate at a sensitivity of 10-8 radians. Five of these tiltmeters, extending along one 35 km section of the fault, have been in operation since June 1973. The results indicate that regional tectonic tilting has occurred before more than ten individual earthquakes or groups of earthquakes with epicenters within ten earthquake source dimensions of one or more instruments. This tilting has a time scale of up to a month depending on earthquake magnitude. The amplitude of these tilts exceeds by almost an order of magnitude that expected from a dislocation model of the source using seismically determined parameters. No indication of rapid or accelerated tilt just prior to these earthquakes has been seen. ?? 1975 Birkha??user Verlag.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The nature of surface tilt along 85 km of the San Andreas fault-preliminary results form a 14-instrument array
Series title:
Pure and Applied Geophysics PAGEOPH
DOI:
10.1007/BF01592914
Volume
113
Issue:
1
Year Published:
1975
Language:
English
Publisher:
Birkha??user-Verlag
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
237
Last page:
249