Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic waves
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 tele...
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| Format: | Article |
| Language: | English |
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Wiley
2016-05-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL068843 |
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| author | Shiann‐Jong Lee Te‐Yang Yeh Tzu‐Chi Lin Yen‐Yu Lin Teh‐Ru Alex Song Bor‐Shouh Huang |
| author_facet | Shiann‐Jong Lee Te‐Yang Yeh Tzu‐Chi Lin Yen‐Yu Lin Teh‐Ru Alex Song Bor‐Shouh Huang |
| author_sort | Shiann‐Jong Lee |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-ee505d6870c846d09244c82223cb979d |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-ee505d6870c846d09244c82223cb979d2025-08-20T02:31:41ZengWileyGeophysical Research Letters0094-82761944-80072016-05-0143104979498510.1002/2016GL068843Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic wavesShiann‐Jong Lee0Te‐Yang Yeh1Tzu‐Chi Lin2Yen‐Yu Lin3Teh‐Ru Alex Song4Bor‐Shouh Huang5Institute of Earth Sciences Academia Sinica Taipei TaiwanInstitute of Earth Sciences Academia Sinica Taipei TaiwanInstitute of Geosciences National Taiwan University Taipei TaiwanInstitute of Earth Sciences Academia Sinica Taipei TaiwanDepartment of Earth Sciences University College London London UKInstitute of Earth Sciences Academia Sinica Taipei TaiwanAbstract 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.https://doi.org/10.1002/2016GL0688432015 Illapel earthquakesource rupture processseismic wave propagationtwo‐stage megathrustsubduction zone |
| spellingShingle | Shiann‐Jong Lee Te‐Yang Yeh Tzu‐Chi Lin Yen‐Yu Lin Teh‐Ru Alex Song Bor‐Shouh Huang Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic waves Geophysical Research Letters 2015 Illapel earthquake source rupture process seismic wave propagation two‐stage megathrust subduction zone |
| title | Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic waves |
| title_full | Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic waves |
| title_fullStr | Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic waves |
| title_full_unstemmed | Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic waves |
| title_short | Two‐stage composite megathrust rupture of the 2015 Mw8.4 Illapel, Chile, earthquake identified by spectral‐element inversion of teleseismic waves |
| title_sort | two stage composite megathrust rupture of the 2015 mw8 4 illapel chile earthquake identified by spectral element inversion of teleseismic waves |
| topic | 2015 Illapel earthquake source rupture process seismic wave propagation two‐stage megathrust subduction zone |
| url | https://doi.org/10.1002/2016GL068843 |
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