A high-resolution, time-variable afterslip model for the 2010 Maule Mw = 8.8, Chile megathrust earthquake

Bedford, Jonathan, Moreno, Marcos, Baez, Juan Carlos, Lange, Dietrich, Tilmann, Frederik, Rosenau, Matthias, Heidbach, Oliver, Oncken, Onno, Bartsch, Mitja, Rietbrock, Andreas, Tassara, Andrés, Bevis, Michael and Vigny, Christophe (2013) A high-resolution, time-variable afterslip model for the 2010 Maule Mw = 8.8, Chile megathrust earthquake Earth and Planetary Science Letters, 383 . pp. 26-36. DOI 10.1016/j.epsl.2013.09.020.

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Abstract

The excellent spatial coverage of continuous GPS stations in the region affected by the Maule Mw = 8.8 2010 earthquake, combined with the proximity of the coast to the seismogenic zone, allows us to model megathrust afterslip on the plate interface with unprecedented detail. We invert post-seismic observations from continuous GPS sites to derive a time-variable model of the first 420 d of afterslip. We also invert co-seismic GPS displacements to create a new co-seismic slip model. The afterslip pattern appears to be transient and non-stationary, with the cumulative afterslip pattern being formed from afterslip pulses. Changes in static stress on the plate interface from the co- and post-seismic slip cannot solely explain the aftershock patterns, suggesting that another process – perhaps fluid related – is controlling the lower magnitude aftershocks. We use aftershock data to quantify the seismic coupling distribution during the post-seismic phase. Comparison of the post-seismic behaviour to interseismic locking suggests that highly locked regions do not necessarily behave as rate-weakening in the post-seismic period. By comparing the inter-seismic locking, co-seismic slip, afterslip, and aftershocks we attempt to classify the heterogeneous frictional behaviour of the plate interface.

Document Type: Article
Keywords: subduction; post-seismic; megathrust; afterslip; GPS; Maule
Research affiliation: GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1016/j.epsl.2013.09.020
ISSN: 0012-821X
Projects: MARISCOS
Date Deposited: 25 Nov 2013 13:30
Last Modified: 06 Mar 2017 13:40
URI: http://eprints.uni-kiel.de/id/eprint/22496

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