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Seismic and aseismic slip on the Central Peru megathrust

Author

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  • Hugo Perfettini

    (Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
    Instituto Geofisico del Perú, Calle Badajos 169, Urb. Mayorazgo, Ate, Lima, Peru
    Laboratoire de Géophysique Interne et Tectonophysique, Université Joseph Fourier/CNRS/IRD/LCPC, Observatoire des Sciences de l'Univers de Grenoble, BP 53, 38041 Grenoble cedex 9, France
    Laboratoire des Mécanismes de Transfert en Géologie, Université Paul Sabatier/CNRS/IRD, Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, 31400 Toulouse, France)

  • Jean-Philippe Avouac

    (Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA)

  • Hernando Tavera

    (Instituto Geofisico del Perú, Calle Badajos 169, Urb. Mayorazgo, Ate, Lima, Peru)

  • Andrew Kositsky

    (Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
    Ashima Research, Pasadena, 600 S. Lake Ave., Pasadena, California 91106, USA)

  • Jean-Mathieu Nocquet

    (GéoAzur, 250 Rue Albert Einstein, 06560 Valbonne, France)

  • Francis Bondoux

    (Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
    Instituto Geofisico del Perú, Calle Badajos 169, Urb. Mayorazgo, Ate, Lima, Peru
    Laboratoire de Géophysique Interne et Tectonophysique, Université Joseph Fourier/CNRS/IRD/LCPC, Observatoire des Sciences de l'Univers de Grenoble, BP 53, 38041 Grenoble cedex 9, France)

  • Mohamed Chlieh

    (Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
    GéoAzur, 250 Rue Albert Einstein, 06560 Valbonne, France)

  • Anthony Sladen

    (Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA)

  • Laurence Audin

    (Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
    Instituto Geofisico del Perú, Calle Badajos 169, Urb. Mayorazgo, Ate, Lima, Peru
    Laboratoire des Mécanismes de Transfert en Géologie, Université Paul Sabatier/CNRS/IRD, Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, 31400 Toulouse, France)

  • Daniel L. Farber

    (University of California Santa Cruz, Santa Cruz, California 95064, USA
    Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA)

  • Pierre Soler

    (Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France)

Abstract

Slip on the Peru megathrust Hugo Perfettini and colleagues show that the 2007 magnitude-8.0 Pisco earthquake in central Peru ruptured two asperities within a patch that had remained locked over the interseismic period, and triggered aseismic frictional afterslip on two adjacent patches. The most prominent patch of afterslip coincides with the subducting Nazca ridge, an area also characterized by a low interseismic coupling, which seems to have repeatedly acted as a barrier to seismic rupture propagation in the past. Aseismic slip accounts for as much as 50–70 per cent of the slip budget on the seismogenic portion of the megathrust in central Peru, and the return period of magnitude-8.0 earthquakes in the Pisco area is estimated to be 250 years.

Suggested Citation

  • Hugo Perfettini & Jean-Philippe Avouac & Hernando Tavera & Andrew Kositsky & Jean-Mathieu Nocquet & Francis Bondoux & Mohamed Chlieh & Anthony Sladen & Laurence Audin & Daniel L. Farber & Pierre Soler, 2010. "Seismic and aseismic slip on the Central Peru megathrust," Nature, Nature, vol. 465(7294), pages 78-81, May.
    • Handle: RePEc:nat:nature:v:465:y:2010:i:7294:d:10.1038_nature09062
    DOI: 10.1038/nature09062
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