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Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake

We developed a flexible finite-fault inversion method for teleseismic P waveforms to obtain a detailed rupture process of a complex multiple-fault earthquake. We estimate the distribution of potency-rate density tensors on an assumed model plane to clarify rupture evolution processes, including vari...

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Autores principales: Yamashita, Shinji, Yagi, Yuji, Okuwaki, Ryo, Shimizu, Kousuke, Agata, Ryoichiro, Fukahata, Yukitoshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7966370/
https://www.ncbi.nlm.nih.gov/pubmed/33727671
http://dx.doi.org/10.1038/s41598-021-85522-w
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author Yamashita, Shinji
Yagi, Yuji
Okuwaki, Ryo
Shimizu, Kousuke
Agata, Ryoichiro
Fukahata, Yukitoshi
author_facet Yamashita, Shinji
Yagi, Yuji
Okuwaki, Ryo
Shimizu, Kousuke
Agata, Ryoichiro
Fukahata, Yukitoshi
author_sort Yamashita, Shinji
collection PubMed
description We developed a flexible finite-fault inversion method for teleseismic P waveforms to obtain a detailed rupture process of a complex multiple-fault earthquake. We estimate the distribution of potency-rate density tensors on an assumed model plane to clarify rupture evolution processes, including variations of fault geometry. We applied our method to the 23 January 2018 Gulf of Alaska earthquake by representing slip on a projected horizontal model plane at a depth of 33.6 km to fit the distribution of aftershocks occurring within one week of the mainshock. The obtained source model, which successfully explained the complex teleseismic P waveforms, shows that the 2018 earthquake ruptured a conjugate system of N-S and E-W faults. The spatiotemporal rupture evolution indicates irregular rupture behavior involving a multiple-shock sequence, which is likely associated with discontinuities in the fault geometry that originated from E-W sea-floor fracture zones and N-S plate-bending faults.
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spelling pubmed-79663702021-03-19 Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake Yamashita, Shinji Yagi, Yuji Okuwaki, Ryo Shimizu, Kousuke Agata, Ryoichiro Fukahata, Yukitoshi Sci Rep Article We developed a flexible finite-fault inversion method for teleseismic P waveforms to obtain a detailed rupture process of a complex multiple-fault earthquake. We estimate the distribution of potency-rate density tensors on an assumed model plane to clarify rupture evolution processes, including variations of fault geometry. We applied our method to the 23 January 2018 Gulf of Alaska earthquake by representing slip on a projected horizontal model plane at a depth of 33.6 km to fit the distribution of aftershocks occurring within one week of the mainshock. The obtained source model, which successfully explained the complex teleseismic P waveforms, shows that the 2018 earthquake ruptured a conjugate system of N-S and E-W faults. The spatiotemporal rupture evolution indicates irregular rupture behavior involving a multiple-shock sequence, which is likely associated with discontinuities in the fault geometry that originated from E-W sea-floor fracture zones and N-S plate-bending faults. Nature Publishing Group UK 2021-03-16 /pmc/articles/PMC7966370/ /pubmed/33727671 http://dx.doi.org/10.1038/s41598-021-85522-w Text en © The Author(s) 2021 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Yamashita, Shinji
Yagi, Yuji
Okuwaki, Ryo
Shimizu, Kousuke
Agata, Ryoichiro
Fukahata, Yukitoshi
Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
title Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
title_full Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
title_fullStr Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
title_full_unstemmed Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
title_short Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
title_sort consecutive ruptures on a complex conjugate fault system during the 2018 gulf of alaska earthquake
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7966370/
https://www.ncbi.nlm.nih.gov/pubmed/33727671
http://dx.doi.org/10.1038/s41598-021-85522-w
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