Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; December 1976; v. 66; no. 6; p. 1921-1929
© 1976 Seismological Society of America
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A study of microseismicity in Northern Baja California, Mexico

TRACY L. JOHNSON, JUAN MADRID and THEODORE KOCZYNSKI

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY, PALISADES, NEW YORK 10964
CENTRO DE INVESTIGACION CIENTIFICIA Y DE EDUCACION, SUPERIOR DE ENSENADA, B.C. Mexico

Abstract

Five 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 dection 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.




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