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AGU: Geophysical Research Letters

 

Index Terms

  • Seismology: Seismicity and seismotectonics
  • Tectonophysics: Dynamics, seismotectonics
  • Tectonophysics: Plate boundary—general

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1264, 4 PP., 2002
doi:10.1029/2001GL013244

Seismogenic plane of the northern Andean Subduction Zone from aftershocks of the Antofagasta (Chile) 1995 earthquake

Robert Patzig

Freie Universität Berlin, Germany

Serge Shapiro

Freie Universität Berlin, Germany

Günter Asch

GeoForschungsZentrum Potsdam, Germany

Peter Giese

Freie Universität Berlin, Germany

Peter Wigger

Freie Universität Berlin, Germany

A temporary seismological network, which was located in the Antofagasta (northern Chile) region, recorded a large part of the aftershocks from a MW = 8.0 earthquake in 1995. Results from a tomographic inversion show that the aftershocks were concentrated in a plane, approximately 3 km thick spatial zone. Comparison of our results with earlier processed wide-angle reflection data, shows clearly that this zone is positioned at the top of the oceanic crust. Therefore, it represents the shearing boundary between the subducting oceanic and the continental plate, and gives an in-situ estimation of the thickness of the boundary. Outside of this zone, events were detected in the continental crust, as well as within the oceanic mantle.

Published 30 April 2002.

Citation: Patzig, R., S. Shapiro, G. Asch, P. Giese, and P. Wigger (2002), Seismogenic plane of the northern Andean Subduction Zone from aftershocks of the Antofagasta (Chile) 1995 earthquake, Geophys. Res. Lett., 29(8), 1264, doi:10.1029/2001GL013244.

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