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2017年瓦尔帕莱索6.9级地震初始阶段的地震和非地震断层滑动

Seismic and Aseismic Fault Slip During the Initiation Phase of the 2017 = 6.9 Valparaíso Earthquake.

作者信息

Caballero Emmanuel, Chounet Agnès, Duputel Zacharie, Jara Jorge, Twardzik Cedric, Jolivet Romain

机构信息

Institut Terre et Environnement de Strasbourg (UMR 7063) Université de Strasbourg/EOST CNRS Strasbourg France.

Laboratoire de Géologie, Département de Géosciences CNRS UMR 8538 École Normale Supérieure PSL University Paris France France.

出版信息

Geophys Res Lett. 2021 Mar 28;48(6):e2020GL091916. doi: 10.1029/2020GL091916. Epub 2021 Mar 22.

DOI:10.1029/2020GL091916
PMID:33867597
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8047919/
Abstract

Transient deformation associated with foreshocks activity has been observed before large earthquakes, suggesting the occurrence of a detectable preseismic slow slip during the initiation phase. A critical issue consists in discriminating the relative contributions from seismic and aseismic fault slip during the preparation phase of large earthquakes. We focus on the April-May 2017 Valparaíso earthquake sequence, which involved a  = 6.9 earthquake preceded by intense foreshock activity. To assess the relative contribution of seismic and aseismic slip, we compare surface displacement predicted from foreshocks source models with transient motion measured prior to the mainshock. The comparison between observed and predicted displacements shows that only half of the total displacement can be explained by the contribution of foreshocks. This result suggests the presence of aseismic pre-slip during an initiation phase preceding the mainshock.

摘要

在大地震之前已观测到与前震活动相关的瞬态变形，这表明在起始阶段会发生可检测到的震前慢滑。一个关键问题在于区分大地震准备阶段地震断层滑动和非地震断层滑动的相对贡献。我们聚焦于2017年4月至5月的瓦尔帕莱索地震序列，该序列包含一次M = 6.9级地震，且之前有强烈的前震活动。为评估地震滑动和非地震滑动的相对贡献，我们将前震源模型预测的地表位移与主震前测量的瞬态运动进行比较。观测位移与预测位移之间的比较表明，总位移中只有一半可由前震的贡献来解释。这一结果表明在主震之前的起始阶段存在非地震预滑。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/dbadf3598f74/GRL-48-e2020GL091916-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/ffc4553b1811/GRL-48-e2020GL091916-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/dbfd9ae817d6/GRL-48-e2020GL091916-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/2de5157abdf1/GRL-48-e2020GL091916-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/dbadf3598f74/GRL-48-e2020GL091916-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/ffc4553b1811/GRL-48-e2020GL091916-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/dbfd9ae817d6/GRL-48-e2020GL091916-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/2de5157abdf1/GRL-48-e2020GL091916-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f2f/8047919/dbadf3598f74/GRL-48-e2020GL091916-g002.jpg

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本文引用的文献

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