NDLI: Microseismicity, tectonics and seismic potential in southern Caribbean and northern Venezuela

Content Provider	Springer Nature Link
Author	Pérez, Omar J. Sanz, Carlos Lagos, Gabriela
Copyright Year	1997
Abstract	Approximately one thousand microearthquakes with body-wave magnitude mb have been located in northern Venezuela and the southern Caribbean region (9–12° N; 64–70° W) since the installation in 1980 of the Venezuelan Seismological Array, together with forty events of mb ≤ 4, one of them with surface-wave magnitude Ms ∼ 6. Focal depths are in the range of 0 to <15 km. This geologically complex region is part of the boundary between the Caribbean and the South American Plates. Epicentral locations indicate that this E–W oriented portion of the boundary is formed by two ∼400 km long subparallel fault zones: San Sebastián fault zone (SSF), ∼20 km north of Caracas along the coast; and La Victoria fault zone (LVF), ∼25 km south of the city. They are clearly delineated by the microseismicity. New composite focal mechanism solutions (CFMS) along these faults show right-lateral strike-slip (RLSS) motion on nearly E–W oriented fault planes. NW-striking subsidiary active faults occur in the region and intercept the two main E–W fault zones. These interceptions show high levels of microearthquake activity and seismic moment release when compared to other portions of both, the main and subsidiary faults. New CFMS at those fault crossing sites show NW-striking RLSS motion and normal faulting, in an en-echelon-like structural behavior. Geological data and quantitative comparisons with other transcurrent plate boundaries in the world suggest that the rate of plate motion in this area is on the order of 20 mm/y. Several moderate and large shocks have occurred along the SSF and LVF since ∼1640, including an Ms ∼ 7.6 event in 1900 on SSF. Although the region may be relatively far from a repeat of this earthquake, seismicity data indicate that strong shocks could take place along segments of the seismically active faults identified in this study.
Starting Page	15
Ending Page	28
Page Count	14
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	1
Issue Number	1
e-ISSN	1573157X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Structural Geology Geophysics/Geodesy Hydrogeology Geotechnical Engineering
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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