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Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust

Slow slip phenomena deep in subduction zones reveal cyclic processes downdip of locked megathrusts. Here we analyze seismicity within a subducting oceanic slab, spanning ~50 major deep slow slip with tremor episodes over 17 years. Changes in rate, b-values, and stress orientations of in-slab seismic...

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Autores principales: Kita, Saeko, Houston, Heidi, Yabe, Suguru, Tanaka, Sachiko, Asano, Youichi, Shibutani, Takuo, Suda, Naoki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8692312/
https://www.ncbi.nlm.nih.gov/pubmed/34934061
http://dx.doi.org/10.1038/s41467-021-27453-8
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author Kita, Saeko
Houston, Heidi
Yabe, Suguru
Tanaka, Sachiko
Asano, Youichi
Shibutani, Takuo
Suda, Naoki
author_facet Kita, Saeko
Houston, Heidi
Yabe, Suguru
Tanaka, Sachiko
Asano, Youichi
Shibutani, Takuo
Suda, Naoki
author_sort Kita, Saeko
collection PubMed
description Slow slip phenomena deep in subduction zones reveal cyclic processes downdip of locked megathrusts. Here we analyze seismicity within a subducting oceanic slab, spanning ~50 major deep slow slip with tremor episodes over 17 years. Changes in rate, b-values, and stress orientations of in-slab seismicity are temporally associated with the episodes. Furthermore, although stress orientations in the slab below these slow slips may rotate slightly, in-slab orientations 20–50 km updip from there rotate farther, suggesting that previously-unrecognized transient slow slip occurs on the plate interface updip. We infer that fluid pressure propagates from slab to interface, promoting episodes of slow slip, which break mineral seals, allowing the pressure to propagate tens of km further updip along the interface where it promotes transient slow slips. The proposed methodology, based primarily on in-slab seismicity, may help monitor plate boundary conditions and slow slip phenomena, which can signal the beginning stages of megathrust earthquakes.
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spelling pubmed-86923122022-01-18 Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust Kita, Saeko Houston, Heidi Yabe, Suguru Tanaka, Sachiko Asano, Youichi Shibutani, Takuo Suda, Naoki Nat Commun Article Slow slip phenomena deep in subduction zones reveal cyclic processes downdip of locked megathrusts. Here we analyze seismicity within a subducting oceanic slab, spanning ~50 major deep slow slip with tremor episodes over 17 years. Changes in rate, b-values, and stress orientations of in-slab seismicity are temporally associated with the episodes. Furthermore, although stress orientations in the slab below these slow slips may rotate slightly, in-slab orientations 20–50 km updip from there rotate farther, suggesting that previously-unrecognized transient slow slip occurs on the plate interface updip. We infer that fluid pressure propagates from slab to interface, promoting episodes of slow slip, which break mineral seals, allowing the pressure to propagate tens of km further updip along the interface where it promotes transient slow slips. The proposed methodology, based primarily on in-slab seismicity, may help monitor plate boundary conditions and slow slip phenomena, which can signal the beginning stages of megathrust earthquakes. Nature Publishing Group UK 2021-12-21 /pmc/articles/PMC8692312/ /pubmed/34934061 http://dx.doi.org/10.1038/s41467-021-27453-8 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Kita, Saeko
Houston, Heidi
Yabe, Suguru
Tanaka, Sachiko
Asano, Youichi
Shibutani, Takuo
Suda, Naoki
Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust
title Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust
title_full Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust
title_fullStr Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust
title_full_unstemmed Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust
title_short Effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust
title_sort effects of episodic slow slip on seismicity and stress near a subduction-zone megathrust
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8692312/
https://www.ncbi.nlm.nih.gov/pubmed/34934061
http://dx.doi.org/10.1038/s41467-021-27453-8
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