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ALOS Study of the 2007 Pisco, Peru Earthquake

Juliet Biggs(1), Falk Amelung(1) and Tim Dixon(1)

(1) University of Miami, 4600 Rickenbacker Causeway, Miami 33149, United States

Abstract

The Pisco, Peru earthquake (M8.0) was the deadliest earthquake of 2007. We investigate this event using a combination of geodetic and seismological data. Analysis of teleseismic records indicates that the earthquake consisted of two pulses of moment release with the second pulse occurring 55-70s and 40 km south of the epicentre. We combine InSAR data from L-band (ALOS) and C-band (Envisat) satellites to produce a 3-dimensional image of the ground displacements caused by the earthquake, which clearly show that the hingeline between uplift and subsidence is aligned with the coastline. Distributed slip inversions identify a single large patch of slip in the location of the second of the seismoligically-identified pulses. Despite a clear spatial coincidence between the location of the coseismic slip and the anomalously high topography of the Paracas Peninsula, we find no evidence that the earthquake was directly responsible for motion on any upper plate faults.

 

Symposium presentation

 

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