Two-stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral-element inversion of teleseismic waves

被引：33

作者：

Lee, Shiann-Jong ^{[1
]}

Yeh, Te-Yang ^{[1
]}

Lin, Tzu-Chi ^{[2
]}

Lin, Yen-Yu ^{[1
]}

Song, Teh-Ru Alex ^{[3
]}

Huang, Bor-Shouh ^{[1
]}

机构：

[1] Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan

[2] Natl Taiwan Univ, Inst Geosci, Taipei 10764, Taiwan

[3] UCL, Dept Earth Sci, London, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 10期

关键词：

TOHOKU-OKI EARTHQUAKE;

D O I：

10.1002/2016GL068843

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The M(w)8.4 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 M(w)8.32, 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 M(w)8.08, 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.

引用

页码：4979 / 4985

页数：7