Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations

Abstract The 2011 magnitude (M) 9.0 Tohoku-oki earthquake was followed by seismicity activation in inland areas throughout Japan. An outstanding case is the M6.2 Northern Nagano earthquake, central Japan, occurred 13-h after the megathrust event, approximately 400 km away from its epicenter. The phy...

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Autores principales:	Kengo Shimojo, Bogdan Enescu, Yuji Yagi, Tetsuya Takeda
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0fa1648f07e945a0bdaf6ff460b7cb6a
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spelling	oai:doaj.org-article:0fa1648f07e945a0bdaf6ff460b7cb6a2021-12-02T15:51:14ZNucleation process of the 2011 northern Nagano earthquake from nearby seismic observations10.1038/s41598-021-86837-42045-2322https://doaj.org/article/0fa1648f07e945a0bdaf6ff460b7cb6a2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86837-4https://doaj.org/toc/2045-2322Abstract The 2011 magnitude (M) 9.0 Tohoku-oki earthquake was followed by seismicity activation in inland areas throughout Japan. An outstanding case is the M6.2 Northern Nagano earthquake, central Japan, occurred 13-h after the megathrust event, approximately 400 km away from its epicenter. The physical processes relating the occurrence of megathrust earthquakes and subsequent activation of relatively large inland earthquakes are not well understood. Here we use waveform data of a dense local seismic network to reveal with an unprecedented resolution the complex mechanisms leading to the occurrence of the M6.2 earthquake. We show that previously undetected small earthquakes initiated along the Nagano earthquake source fault at relatively short times after the Tohoku-oki megathrust earthquake, and the local seismicity continued intermittently until the occurrence of the M6.2 event, being likely ‘modulated’ by the arrival of surface waves from large, remote aftershocks off-shore Tohoku. About 1-h before the Nagano earthquake, there was an acceleration of micro-seismicity migrating towards its hypocenter. Migration speeds indicate potential localized slow-slip, culminating with the occurrence of the large inland earthquake, with fluids playing a seismicity-activation role at a regional scale.Kengo ShimojoBogdan EnescuYuji YagiTetsuya TakedaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kengo Shimojo Bogdan Enescu Yuji Yagi Tetsuya Takeda Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations
description	Abstract The 2011 magnitude (M) 9.0 Tohoku-oki earthquake was followed by seismicity activation in inland areas throughout Japan. An outstanding case is the M6.2 Northern Nagano earthquake, central Japan, occurred 13-h after the megathrust event, approximately 400 km away from its epicenter. The physical processes relating the occurrence of megathrust earthquakes and subsequent activation of relatively large inland earthquakes are not well understood. Here we use waveform data of a dense local seismic network to reveal with an unprecedented resolution the complex mechanisms leading to the occurrence of the M6.2 earthquake. We show that previously undetected small earthquakes initiated along the Nagano earthquake source fault at relatively short times after the Tohoku-oki megathrust earthquake, and the local seismicity continued intermittently until the occurrence of the M6.2 event, being likely ‘modulated’ by the arrival of surface waves from large, remote aftershocks off-shore Tohoku. About 1-h before the Nagano earthquake, there was an acceleration of micro-seismicity migrating towards its hypocenter. Migration speeds indicate potential localized slow-slip, culminating with the occurrence of the large inland earthquake, with fluids playing a seismicity-activation role at a regional scale.
format	article
author	Kengo Shimojo Bogdan Enescu Yuji Yagi Tetsuya Takeda
author_facet	Kengo Shimojo Bogdan Enescu Yuji Yagi Tetsuya Takeda
author_sort	Kengo Shimojo
title	Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations
title_short	Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations
title_full	Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations
title_fullStr	Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations
title_full_unstemmed	Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations
title_sort	nucleation process of the 2011 northern nagano earthquake from nearby seismic observations
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0fa1648f07e945a0bdaf6ff460b7cb6a
work_keys_str_mv	AT kengoshimojo nucleationprocessofthe2011northernnaganoearthquakefromnearbyseismicobservations AT bogdanenescu nucleationprocessofthe2011northernnaganoearthquakefromnearbyseismicobservations AT yujiyagi nucleationprocessofthe2011northernnaganoearthquakefromnearbyseismicobservations AT tetsuyatakeda nucleationprocessofthe2011northernnaganoearthquakefromnearbyseismicobservations
_version_	1718385613156122624

Nucleation process of the 2011 northern Nagano earthquake from nearby seismic observations

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