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Two-stage composite megathrust rupture of the 2015 M(w)8.4 Illapel, Chile, earthquake identified by spectral-element inversion of teleseismic waves

Lee, S-J; Yeh, T-Y; Lin, T-C; Lin, Y-Y; Song, T-RA; Huang, B-S; (2016) Two-stage composite megathrust rupture of the 2015 M(w)8.4 Illapel, Chile, earthquake identified by spectral-element inversion of teleseismic waves. Geophysical Research Letters , 43 (10) pp. 4979-4985. 10.1002/2016GL068843. Green open access

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Abstract

The Mw8.4 Illapel earthquake occurred on 16 September was the largest global event in 2015. This earthquake was not unexpected because the hypocenter was located in a seismic gap of the Peru-Chile subduction zone. However, the source model derived from 3-D spectral-element inversion of teleseismic waves reveals a distinct two-stage rupture process with completely different slip characteristics as a composite megathrust event. The two stages were temporally separated. Rupture in the first stage, with a moment magnitude of Mw8.32, built up energetically from the deeper locked zone and propagated in the updip direction toward the trench. Subsequently, the rupture of the second stage, with a magnitude of Mw8.08, mainly occurred in the shallow subduction zone with atypical repeating slip behavior. The unique spatial-temporal rupture evolution presented in this source model is key to further in-depth studies of earthquake physics and source dynamics in subduction systems.

Type: Article
Title: Two-stage composite megathrust rupture of the 2015 M(w)8.4 Illapel, Chile, earthquake identified by spectral-element inversion of teleseismic waves
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/2016GL068843
Publisher version: http://doi.org/10.1002/2016GL068843
Language: English
Additional information: Copyright © 2016, The Authors. All rights reserved. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided theoriginal work is properly cited, the use is non-commercial and no modificationor adaptations are made. Further details about CC BY licenses are available at http://creativecommons.org/ licenses/by/4.0.
Keywords: 2015 Illapel earthquake; source rupture process; seismic wave propagation; two-stage megathrust; subduction zone
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1502425
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