Morphology of the andean wadati-benioff zone, andesitic volcanism, and tectonic features of the nazca plate |
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| Authors: | V Hanus&#x; J Vank |
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| Institution: | V. Hanus?,J. Van k |
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| Abstract: | The morphology of the Andean Wadati-Benioff zone south of 10° S was established on the basis of the distribution of earthquake foci. The existence of an intermediate aseismic gap, closely connected with the Andean andesitic volcanism, was confirmed. The gap, interpreted as a partially melted zone, is supposed to be the source of primary magma for active andesitic volcanoes. A clear correlation between the depth range of the Andean Wadati-Benioff zone and the major structural units of the Nazca plate was found. It implicates a non-uniform rate of subduction along the Peru—Chile trench due to the hampering effect related to the main tectonic features of the subducting oceanic plate. The Andean deep earthquakes with focal depths greater than 500 km are interpreted as a remnant of the foregoing cycle of subduction. |
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