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Published May 2016 | Supplemental Material + Published
Journal Article Open

Postseismic relocking of the subduction megathrust following the 2007 Pisco, Peru, earthquake

Abstract

Characterizing the time evolution of slip over different phases of the seismic cycle is crucial to a better understanding of the factors controlling the occurrence of large earthquakes. In this study, we take advantage of interferometric synthetic aperture radar data and 3.5 years of continuous Global Positioning System (GPS) measurements to determine interseismic, coseismic, and postseismic slip distributions in the region of the 2007, M_w 8.0 Pisco, earthquake, Peru, using the same fault geometry and inversion method. Our interseismic model, based on pre-2007 campaign GPS data, suggests that the 2007 Pisco seismic slip occurred in a region strongly coupled before the earthquake while afterslip occurred in low coupled regions. Large afterslip occurred in the peripheral area of coseismic rupture in agreement with the notion that afterslip is mainly induced by coseismic stress changes. The temporal evolution of the region of maximum afterslip, characterized by a relaxation time of about 2.3 years, is located in the region where the Nazca ridge is subducting, consistent with rate-strengthening friction promoting aseismic slip. We estimate a return period for the Pisco earthquake of about 230 years with an estimated aseismic slip that might account for about 50% of the slip budget in this region over the 0–50 km seismogenic depth range. A major result of this study is that the main asperity that ruptured during the 2007 Pisco earthquake relocked soon after this event.

Additional Information

© 2016 American Geophysical Union. Received 22 JUL 2015; Accepted 28 APR 2016; Accepted article online 3 MAY 2016; Published online 27 MAY 2016. ASAR data were provided by the European Space Agency (ESA) through the project Envisat-AO857 and category 1 2899. PALSAR data from the ALOS satellite mission operated by the Japanese Aerospace Exploration Agency (JAXA) were used under the terms and conditions of the fourth ALOS 2 Research Announcement (project 1142). This work was supported by the Institut de Recherche pour le Développement (IRD). We thank the people from Laguna Grande village for their great support. We thank Nino Puma Sacsi for this precious help in maintaining station LAGU operational and Alberto Zheimer for supporting the network from day 70 to day 220. Some of the figures were prepared using the GMT software [Wessel and Smith, 1991]. The data for this paper are available by contacting the corresponding author at remy@ird.fr. We thank Lisa Christiansen for editing the text. The Assistant Editor and an anonymous reviewer provided useful and constructive remarks that greatly improved this study.

Attached Files

Published - Remy_et_al-2016-Journal_of_Geophysical_Research__Solid_Earth.pdf

Supplemental Material - jgrb51616-sup-0001-Supplementary.pdf

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jgrb51616-sup-0001-Supplementary.pdf
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Additional details

Created:
August 22, 2023
Modified:
October 20, 2023