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The configuration of the seismic zone and the downgoing slab in southern Peru

Grange, F. and Cunningham, P. and Gagnepain, J. and Hatzfeld, D. and Molnar, P. and Ocola, L. and Rodrígues, A. and Roecker, S. W. and Stock, J. M. and Suárez, G. (1984) The configuration of the seismic zone and the downgoing slab in southern Peru. Geophysical Research Letters, 11 (1). pp. 38-41. ISSN 0094-8276. doi:10.1029/GL011i001p00038.

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Using data from temporary networks of portable seismographs in southern Peru, we located 888 shallow and intermediate depth events near a proposed discontinuity in the seismic zone there. These events reveal a prominent contortion, instead of a discontinuity, that trends approximately N80°E, parallel to the direction of relative plate motion. North of about 15°S, the seismic zone beneath Peru is nearly horizontal, but south of about 15.5°S, it dips at about 25°. Volcanoes lie above the more steeply dipping zone where earthquakes occur between 120 and 140 km, and the volcanic line in southern Peru stops abruptly at the contortion.

Item Type:Article
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URLURL TypeDescription
Stock, J. M.0000-0003-4816-7865
Suárez, G.0000-0002-2011-4924
Additional Information:© 1984 by the American Geophysical Union. Received October 3, 1983; accepted October 4, 1984. Paper number 3L1785. We thank O. Ancajima, C. Anconeyra, R. Benites, A. Flores, F. Gomez, J. Melgar, T. Modiano, F. Pardo, A. Posadas, E. Salinas, R. Stewart, I. Vallejos, and A. Vilkas for assistance in the field and M. Lazo, F. Megard, M. Sebrier and J.C. Vicente for advice and help with logistics. This work was supported bY NASA grant NAG5-300 of the Geodynamics Program and by an H.O. Wood award from the Carnegie Institution in Washington, D.C.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
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Carnegie Institution of WashingtonUNSPECIFIED
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49475
Deposited By: Ruth Sustaita
Deposited On:09 Sep 2014 16:49
Last Modified:08 Nov 2022 22:27

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