Regional deformation near Palmdale, California, 1973-1983 (USA)

Journal of Geophysical Research B: Solid Earth
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Abstract

The Tehachapi trilateration network spans the intersection of the San Andreas and Garlock faults in southern California in the “Big Bend” region of the San Andreas fault. Analysis of data from 1973–1983 shows strain differences between the northwest and southeast regions of the network and slip at depth on both faults. The Palmdale network, spanning the San Andreas fault entirely within the Tehachapi network, showed increases of about 1 μstrain in both east‐west and north‐south extension in late 1979. The Tehachapi strains also jumped at this time, but the magnitude of the increase was only about one third that of Palmdale. The principal strain rates for Tehachapi over the time interval 1973–1983 are urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0001 μstrain/yr and urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0002 μstrain/yr, with the 1 axis directed N76°E. Strains were also computed for two subregions. The principal strain rates for the southeast Tehachapi region are urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0003 μstrain/yr and urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0004 μStrain/yr, with the 1 axis directed N73°E. This result differs significantly from the principal strain rates at Palmdale ( urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0005 μstrain/yr, urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0006 μstrain/yr, with the 1 axis directed N71°E). For the northwest Tehachapi region, urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0007 μstrain/yr and urn:x-wiley:01480227:media:jgrb4718:jgrb4718-math-0008 μstrain/yr, with the 1 axis directed N93°E.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Regional deformation near Palmdale, California, 1973-1983 (USA)
Series title Journal of Geophysical Research B: Solid Earth
DOI 10.1029/JB089iB04p02471
Volume 89
Issue B4
Year Published 1984
Language English
Publisher Wiley
Contributing office(s) Earthquake Science Center
Description 7 p.
First page 2471
Last page 2477
Country United States
State California
Other Geospatial Near Palmdale
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