| 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. |
| Genre: | Article |
| ProdID: | 70001224 |
| Citation Author: | Mortensen, C. E.; Johnston, M. J. S. |
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| Citation End Page: | 249 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Pure and Applied Geophysics PAGEOPH |
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| Citation Publisher: | Birkha??user-Verlag |
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| Citation Search Results Text: | The nature of surface tilt along 85 km of the San Andreas fault-preliminary results form a 14-instrument array; 1975; Article; Journal; Pure and Applied Geophysics PAGEOPH; Mortensen, C. E.; Johnston, M. J. S. |
| Citation Start Page: | 237 |
| Citation Volume: | 113 |
| Citation Year: | 1975 |
| Type: | citation/reference |
| Text: | The nature of surface tilt along 85 km of the San Andreas fault-preliminary results form a 14-instrument array; 1975; Article; Journal; Pure and Applied Geophysics PAGEOPH; Mortensen, C. E.; Johnston, M. J. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1007/BF01592914 |
| Date Other: | Tue, 28 Sep 2010 23:09 -0500 |
| Publisher: | Birkha??user-Verlag |
