Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 Mw 8.3 Illapel, Chile, earthquake

It is well-established that the post-seismic slip results from the combined contribution of seismic and aseismic processes. However, the partitioning between these two modes of deformation remains unclear due to the difficulty of inferring detailed and robust descriptions of how both evolve...

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Autores principales:	C. Twardzik, M. Vergnolle, A. Sladen, L. L. H. Tsang
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Geology QE1-996.5 Stratigraphy QE640-699
Acceso en línea:	https://doaj.org/article/be21ba8992834554a50b41acd2c70887
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spelling	oai:doaj.org-article:be21ba8992834554a50b41acd2c708872021-11-09T08:35:44ZVery early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake10.5194/se-12-2523-20211869-95101869-9529https://doaj.org/article/be21ba8992834554a50b41acd2c708872021-11-01T00:00:00Zhttps://se.copernicus.org/articles/12/2523/2021/se-12-2523-2021.pdfhttps://doaj.org/toc/1869-9510https://doaj.org/toc/1869-9529<p>It is well-established that the post-seismic slip results from the combined contribution of seismic and aseismic processes. However, the partitioning between these two modes of deformation remains unclear due to the difficulty of inferring detailed and robust descriptions of how both evolve in space and time. This is particularly true just after a mainshock when both processes are expected to be the strongest. Using state-of-the-art sub-daily processing of GNSS data, along with dense catalogs of aftershocks obtained from template-matching techniques, we unravel the spatiotemporal evolution of post-seismic slip and aftershocks over the first 12 h following the 2015 <span class="inline-formula"><i>M</i><sub>w</sub></span> 8.3 Illapel, Chile, earthquake. We show that the very early post-seismic activity occurs over two regions with distinct behaviors. To the north, post-seismic slip appears to be purely aseismic and precedes the occurrence of late aftershocks. To the south, aftershocks are the primary cause of the post-seismic slip. We suggest that this difference in behavior could be inferred only a few hours after the mainshock. We finish by showing that this information can potentially be obtained very rapidly after a large earthquake, which could prove to be useful in forecasting the long-term spatial pattern of aftershocks.</p>C. TwardzikC. TwardzikM. VergnolleA. SladenL. L. H. TsangL. L. H. TsangCopernicus PublicationsarticleGeologyQE1-996.5StratigraphyQE640-699ENSolid Earth, Vol 12, Pp 2523-2537 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5 Stratigraphy QE640-699
spellingShingle	Geology QE1-996.5 Stratigraphy QE640-699 C. Twardzik C. Twardzik M. Vergnolle A. Sladen L. L. H. Tsang L. L. H. Tsang Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake
description	<p>It is well-established that the post-seismic slip results from the combined contribution of seismic and aseismic processes. However, the partitioning between these two modes of deformation remains unclear due to the difficulty of inferring detailed and robust descriptions of how both evolve in space and time. This is particularly true just after a mainshock when both processes are expected to be the strongest. Using state-of-the-art sub-daily processing of GNSS data, along with dense catalogs of aftershocks obtained from template-matching techniques, we unravel the spatiotemporal evolution of post-seismic slip and aftershocks over the first 12 h following the 2015 <span class="inline-formula"><i>M</i><sub>w</sub></span> 8.3 Illapel, Chile, earthquake. We show that the very early post-seismic activity occurs over two regions with distinct behaviors. To the north, post-seismic slip appears to be purely aseismic and precedes the occurrence of late aftershocks. To the south, aftershocks are the primary cause of the post-seismic slip. We suggest that this difference in behavior could be inferred only a few hours after the mainshock. We finish by showing that this information can potentially be obtained very rapidly after a large earthquake, which could prove to be useful in forecasting the long-term spatial pattern of aftershocks.</p>
format	article
author	C. Twardzik C. Twardzik M. Vergnolle A. Sladen L. L. H. Tsang L. L. H. Tsang
author_facet	C. Twardzik C. Twardzik M. Vergnolle A. Sladen L. L. H. Tsang L. L. H. Tsang
author_sort	C. Twardzik
title	Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake
title_short	Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake
title_full	Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake
title_fullStr	Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake
title_full_unstemmed	Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake
title_sort	very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>m</i><sub>w</sub> 8.3 illapel, chile, earthquake
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/be21ba8992834554a50b41acd2c70887
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Very early identification of a bimodal frictional behavior during the post-seismic phase of the 2015 <i>M</i><sub>w</sub> 8.3 Illapel, Chile, earthquake

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