Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan

Abstract The down-dip limit of the seismogenic zone and up-dip and down-dip limits of the deep low-frequency tremors in southwest Japan are clearly imaged by the hypocentre distribution. Previous studies using smooth constraints in inversion analyses estimated that long-term slow slip events (L-SSEs...

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Autores principales:	Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, Shoichi Yoshioka, Masato Okada, Takane Hori
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/be06898fbaf6424c98c6b091e8ef82f4
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spelling	oai:doaj.org-article:be06898fbaf6424c98c6b091e8ef82f42021-12-02T16:06:59ZDiscontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan10.1038/s41598-017-06185-02045-2322https://doaj.org/article/be06898fbaf6424c98c6b091e8ef82f42017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06185-0https://doaj.org/toc/2045-2322Abstract The down-dip limit of the seismogenic zone and up-dip and down-dip limits of the deep low-frequency tremors in southwest Japan are clearly imaged by the hypocentre distribution. Previous studies using smooth constraints in inversion analyses estimated that long-term slow slip events (L-SSEs) beneath the Bungo Channel are distributed smoothly from the down-dip part of the seismogenic zone to the up-dip part of the tremors. Here, we use fused regularisation, a type of sparse modelling suitable for detecting discontinuous changes in the model parameters to estimate the slip distribution of L-SSEs. The largest slip abruptly becomes zero at the down-dip limit of the seismogenic zone, is immediately reduced to half at the up-dip limit of the tremors, and becomes zero near its down-dip limit. Such correspondences imply that some thresholds exist in the generation processes for both tremors and SSEs. Hence, geodetic data inversion with sparse modelling can detect such high resolution in the slip distribution.Ryoko NakataHideitsu HinoTatsu KuwataniShoichi YoshiokaMasato OkadaTakane HoriNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ryoko Nakata Hideitsu Hino Tatsu Kuwatani Shoichi Yoshioka Masato Okada Takane Hori Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan
description	Abstract The down-dip limit of the seismogenic zone and up-dip and down-dip limits of the deep low-frequency tremors in southwest Japan are clearly imaged by the hypocentre distribution. Previous studies using smooth constraints in inversion analyses estimated that long-term slow slip events (L-SSEs) beneath the Bungo Channel are distributed smoothly from the down-dip part of the seismogenic zone to the up-dip part of the tremors. Here, we use fused regularisation, a type of sparse modelling suitable for detecting discontinuous changes in the model parameters to estimate the slip distribution of L-SSEs. The largest slip abruptly becomes zero at the down-dip limit of the seismogenic zone, is immediately reduced to half at the up-dip limit of the tremors, and becomes zero near its down-dip limit. Such correspondences imply that some thresholds exist in the generation processes for both tremors and SSEs. Hence, geodetic data inversion with sparse modelling can detect such high resolution in the slip distribution.
format	article
author	Ryoko Nakata Hideitsu Hino Tatsu Kuwatani Shoichi Yoshioka Masato Okada Takane Hori
author_facet	Ryoko Nakata Hideitsu Hino Tatsu Kuwatani Shoichi Yoshioka Masato Okada Takane Hori
author_sort	Ryoko Nakata
title	Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan
title_short	Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan
title_full	Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan
title_fullStr	Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan
title_full_unstemmed	Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan
title_sort	discontinuous boundaries of slow slip events beneath the bungo channel, southwest japan
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/be06898fbaf6424c98c6b091e8ef82f4
work_keys_str_mv	AT ryokonakata discontinuousboundariesofslowslipeventsbeneaththebungochannelsouthwestjapan AT hideitsuhino discontinuousboundariesofslowslipeventsbeneaththebungochannelsouthwestjapan AT tatsukuwatani discontinuousboundariesofslowslipeventsbeneaththebungochannelsouthwestjapan AT shoichiyoshioka discontinuousboundariesofslowslipeventsbeneaththebungochannelsouthwestjapan AT masatookada discontinuousboundariesofslowslipeventsbeneaththebungochannelsouthwestjapan AT takanehori discontinuousboundariesofslowslipeventsbeneaththebungochannelsouthwestjapan
_version_	1718384802696003584

Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan

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