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.
Preview |
Text
Song-T_2016-two stage composite_Geophysical_Research_Letters.pdf Download (1MB) | Preview |
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-pp.ucl.ac.uk/id/eprint/1502425 |
Archive Staff Only
 |
View Item |
