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A study of microseismicity in northern Baja California, MexicoFive microearthquake instruments were operated for 2 months in 1974 in a small mobile array deployed at various sites near the Agua Blanca and San Miguel faults. An 80-km-long section of the San Miguel fault zone is presently active seismically, producing the vast majority of recorded earthquakes. Very low activity was recorded on the Agua Blanca fault. Events were also located near normal faults forming the eastern edge of the Sierra Juarez suggesting that these faults are active. Hypocenters on the San Miguel fault range in depth from 0 to 20 km although two-thirds are in the upper 10 km. A composite focal mechanism showing a mixture of right-lateral and dip slip, east side up, is similar to a solution obtained for the 1956 San Miguel earthquake which proved consistent with observed surface deformation.
Document ID
19770048897
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Johnson, T. L.
(Lamont-Doherty Geological Observatory Palisades, NY, United States)
Koczynski, T.
(Lamont-Doherty Geological Observatory Palisades, N.Y., United States)
Madrid, J.
(Ensenada Centro de Investigacion Cientifica y de Educacion Superior, Ensenada, Mexico)
Date Acquired
August 8, 2013
Publication Date
December 1, 1976
Publication Information
Publication: Seismological Society of America
Subject Category
Geophysics
Accession Number
77A31749
Funding Number(s)
CONTRACT_GRANT: NGR-33-008-146
Distribution Limits
Public
Copyright
Other

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