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板间锁定在智利北部俯冲边缘上盘断层地震复活中的作用。

The role of interplate locking on the seismic reactivation of upper plate faults on the subduction margin of northern Chile.

作者信息

González Gabriel, Pasten-Araya Francisco, Victor Pia, González Yerko, Valenzuela Jordán, Shrivastava Mahesh

机构信息

Departamento de Ciencias Geológicas, National Research Center for Integrated Natural Disaster Management, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile.

Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile.

出版信息

Sci Rep. 2021 Nov 2;11(1):21444. doi: 10.1038/s41598-021-00875-6.

DOI:10.1038/s41598-021-00875-6
PMID:34728693
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8563723/
Abstract

Quaternary deformation in the northern Chile forearc is controlled by trench parallel shortening along reactivated Mesozoic faults. Dextral strikes-slip is expressed in NW-SE striking faults of the Atacama Fault System, and reverse displacement dominates in E-W faults. This deformation results of the convergence in a concave-seaward continental margin. On September 11th, 2020, a M 6.3 earthquake and its subsequent aftershocks took place in the coastal region of northern Chile, revealing the reactivation of the deepest segment of a WNW-ESE striking upper plate fault. The reactivation of this fault occurred after the M 8.1 Iquique earthquake, and it seems to be connected to a N-S interplate locking segmentation of the plate margin, which is clearly shown by the locking pattern before the Iquique earthquake. This poses the question of how heterogeneous locking influences upper plate seismicity and how it relates to trench-parallel shortening.

摘要

智利北部弧前的第四纪变形受沿复活的中生代断层的平行于海沟的缩短作用控制。右旋走滑表现为阿塔卡马断层系统中走向为西北-东南的断层，而逆冲位移在走向为东西的断层中占主导地位。这种变形是在向海凹的大陆边缘汇聚的结果。2020年9月11日，智利北部沿海地区发生了一次6.3级地震及其后续余震，揭示了一条走向为WNW-ESE的上盘断层最深段的复活。这条断层的复活发生在伊基克8.1级地震之后，似乎与板块边缘的南北向板间锁定分段有关，伊基克地震前的锁定模式清楚地表明了这一点。这就提出了一个问题，即非均匀锁定如何影响上盘地震活动，以及它与平行于海沟的缩短作用有何关系。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/41fef10096e6/41598_2021_875_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/65c213db97a7/41598_2021_875_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/be6e0c807a3a/41598_2021_875_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/706808decd4d/41598_2021_875_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/2443cfaa9bfe/41598_2021_875_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/41fef10096e6/41598_2021_875_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/65c213db97a7/41598_2021_875_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/6eb009d5b209/41598_2021_875_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/be6e0c807a3a/41598_2021_875_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/706808decd4d/41598_2021_875_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/2443cfaa9bfe/41598_2021_875_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccff/8563723/41fef10096e6/41598_2021_875_Fig6_HTML.jpg

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