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

Abstract 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, inclu...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Shinji Yamashita, Yuji Yagi, Ryo Okuwaki, Kousuke Shimizu, Ryoichiro Agata, Yukitoshi Fukahata
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ae2021d39ba84e04830964972bbefc41
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:ae2021d39ba84e04830964972bbefc41
record_format	dspace
spelling	oai:doaj.org-article:ae2021d39ba84e04830964972bbefc412021-12-02T11:39:33ZConsecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake10.1038/s41598-021-85522-w2045-2322https://doaj.org/article/ae2021d39ba84e04830964972bbefc412021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85522-whttps://doaj.org/toc/2045-2322Abstract 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.Shinji YamashitaYuji YagiRyo OkuwakiKousuke ShimizuRyoichiro AgataYukitoshi FukahataNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shinji Yamashita Yuji Yagi Ryo Okuwaki Kousuke Shimizu Ryoichiro Agata Yukitoshi Fukahata Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
description	Abstract 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.
format	article
author	Shinji Yamashita Yuji Yagi Ryo Okuwaki Kousuke Shimizu Ryoichiro Agata Yukitoshi Fukahata
author_facet	Shinji Yamashita Yuji Yagi Ryo Okuwaki Kousuke Shimizu Ryoichiro Agata Yukitoshi Fukahata
author_sort	Shinji Yamashita
title	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_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_sort	consecutive ruptures on a complex conjugate fault system during the 2018 gulf of alaska earthquake
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ae2021d39ba84e04830964972bbefc41
work_keys_str_mv	AT shinjiyamashita consecutiverupturesonacomplexconjugatefaultsystemduringthe2018gulfofalaskaearthquake AT yujiyagi consecutiverupturesonacomplexconjugatefaultsystemduringthe2018gulfofalaskaearthquake AT ryookuwaki consecutiverupturesonacomplexconjugatefaultsystemduringthe2018gulfofalaskaearthquake AT kousukeshimizu consecutiverupturesonacomplexconjugatefaultsystemduringthe2018gulfofalaskaearthquake AT ryoichiroagata consecutiverupturesonacomplexconjugatefaultsystemduringthe2018gulfofalaskaearthquake AT yukitoshifukahata consecutiverupturesonacomplexconjugatefaultsystemduringthe2018gulfofalaskaearthquake
_version_	1718395719669252096

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

Ejemplares similares