Report

The 2010 Mw 8.8 Maule Mega-Thrust Earthquake of Central Chile, Monitored by GPS

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Science  28 Apr 2011:
1204132
DOI: 10.1126/science.1204132

Abstract

Large earthquakes produce crustal deformation that can be quantified by geodetic measurements, allowing for the determination of the slip distribution on the fault. We use data from Global Positioning System networks in Central Chile to infer the static deformation and the kinematics of the 2010 Mw 8.8 Maule mega-thrust earthquake. From elastic modeling, we find a total rupture length of ~500 km where slip (up to 15 m) concentrated on two main asperities situated on both sides of the epicenter. We find that rupture reached shallow depths, probably extending up to the trench. Resolvable afterslip occurred in regions of low coseismic slip. The low-frequency hypocenter is relocated 40 km southwest of initial estimates. Rupture propagated bilaterally at ~3.1 km/s, with possible but not fully resolved velocity variations.

  • The SSN team.

  • The LIA “Montessus de Ballore” post-seismic team.

  • § The CAP team.