Neotectonics of Boconó fault, Western Venezuela |
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| Authors: | Carlos Schubert |
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| Abstract: | Neotectonic morphologic evidence along the Boconó fault (with a mapped length of 500 km) consists of the typical features found along strike-slip faults; offset alluvium and drainage, shutterridges, closed depressions, sag ponds and marshes, fault scarps and trenches, triangular facets, and zones of mylonite and fault gouge. Evidence on fault planes, such as slickensides, suggests a predominant strike-slip displacement, and morphologic evidence suggests that this offset is right-lateral, with a magnitude of 60–100 m during the Holocene, and of several kilometers during the Quaternary. Calculations based on different empirical relationships suggest maximum expected Richter magnitudes of 7.2–7.9 for earthquakes along the fault (using rupture length estimates) and probable intervals of less than 200 years for events of magnitude 8 (using observed total displacement during the Holocene). |
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