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Journal Article

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

Authors

González,  Gabriel
External Organizations;

Pasten-Araya,  Francisco
External Organizations;

/persons/resource/pvictor

Victor,  Pia
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

González,  Yerko
External Organizations;

Valenzuela,  Jordán
External Organizations;

Shrivastava,  Mahesh
External Organizations;

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5008613.pdf
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Citation

González, G., Pasten-Araya, F., Victor, P., González, Y., Valenzuela, J., Shrivastava, M. (2021): The role of interplate locking on the seismic reactivation of upper plate faults on the subduction margin of northern Chile. - Scientific Reports, 11, 21444.
https://doi.org/10.1038/s41598-021-00875-6


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008613
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 Mw 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 Mw 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.