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Book Chapter

Crustal Structure and Seismotectonics of Northern Baja California

By
J. Frez
J. Frez
Division de Ciencias de la Tierra Centro de Investigación Cientifica y de Educación Superior de Ensenada Ensenada, B.C., Maxico
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J. J. González
J. J. González
Division de Ciencias de la Tierra Centro de Investigación Cientifica y de Educación Superior de Ensenada Ensenada, B.C., Maxico
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Published:
January 01, 1991

Abstract

In the short historical record of northern Baja California, the largest earthquake has a magnitude 7.1. Most of the earthquakes with ML > 6.0 occur along the Cerro Prieto, Imperial, and San Miguel faults; no significant seismicity is known to have occurred along the Agua Blanca fault. A large part of the microseismicity (ML < 3.0) is sporadic, dominated by swarms, and in good correlation with mapped faults. Seismogenic depths are restricted to the upper part of the crust. Two seismic zones are defined by the microseismicity of the Mexicali-Imperial Valley; this activity is mostly clustered in the basement. Typical focal mechanisms are consistent with a strike-slip, right-lateral motion, striking northwest. This is the case for the last four events of ML > 6.0 in the Salton Trough. Focal mechanisms for the seismic zones and the head of the Gulf of California are mainly of a strike-slip and dip-slip nature.

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Contents

AAPG Memoir

The Gulf and Peninsular Province of the Californias

J. Paul Dauphin
J. Paul Dauphin
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Bernd R. T. Simoneit
Bernd R. T. Simoneit
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American Association of Petroleum Geologists
Volume
47
ISBN electronic:
9781629811130
Publication date:
January 01, 1991

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