Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake

Abstract Despite the challenges in identifying earthquake precursors in intraplate (inland) earthquakes, various hydrological and geochemical measurements have been conducted to establish a possible link to seismic activities. Anomalous increases in radon (222Rn) concentration in soil, groundwater,...

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Autores principales:	Jun Muto, Yumi Yasuoka, Nao Miura, Daichi Iwata, Hiroyuki Nagahama, Mitsuhiro Hirano, Yoshiro Ohmomo, Takahiro Mukai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3e88394ff1d24c18adcd5c31d065f72b
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spelling	oai:doaj.org-article:3e88394ff1d24c18adcd5c31d065f72b2021-12-02T18:18:06ZPreseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake10.1038/s41598-021-86777-z2045-2322https://doaj.org/article/3e88394ff1d24c18adcd5c31d065f72b2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86777-zhttps://doaj.org/toc/2045-2322Abstract Despite the challenges in identifying earthquake precursors in intraplate (inland) earthquakes, various hydrological and geochemical measurements have been conducted to establish a possible link to seismic activities. Anomalous increases in radon (222Rn) concentration in soil, groundwater, and atmosphere have been reported prior to large earthquakes. Although the radon concentration in the atmosphere is lower than that in groundwater and soils, a recent statistical analysis has suggested that the average atmospheric concentration over a relatively wide area reflects crustal deformation. However, no study has sought to determine the underlying physico-chemical relationships between crustal deformation and anomalous atmospheric radon concentrations. Here, we show a significant decrease in the atmospheric radon concentration temporally linked to the seismic quiescence before the 2018 Northern Osaka earthquake occurring at a hidden fault with complex rupture dynamics. During seismic quiescence, deep-seated sedimentary layers in Osaka Basin, which might be the main sources of radon, become less damaged and fractured. The reduction in damage leads to a decrease in radon exhalation to the atmosphere near the fault, causing the preseismic radon decrease in the atmosphere. Herein, we highlight the necessity of continuous monitoring of the atmospheric radon concentration, combined with statistical anomaly detection method, to evaluate future seismic risks.Jun MutoYumi YasuokaNao MiuraDaichi IwataHiroyuki NagahamaMitsuhiro HiranoYoshiro OhmomoTakahiro MukaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jun Muto Yumi Yasuoka Nao Miura Daichi Iwata Hiroyuki Nagahama Mitsuhiro Hirano Yoshiro Ohmomo Takahiro Mukai Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake
description	Abstract Despite the challenges in identifying earthquake precursors in intraplate (inland) earthquakes, various hydrological and geochemical measurements have been conducted to establish a possible link to seismic activities. Anomalous increases in radon (222Rn) concentration in soil, groundwater, and atmosphere have been reported prior to large earthquakes. Although the radon concentration in the atmosphere is lower than that in groundwater and soils, a recent statistical analysis has suggested that the average atmospheric concentration over a relatively wide area reflects crustal deformation. However, no study has sought to determine the underlying physico-chemical relationships between crustal deformation and anomalous atmospheric radon concentrations. Here, we show a significant decrease in the atmospheric radon concentration temporally linked to the seismic quiescence before the 2018 Northern Osaka earthquake occurring at a hidden fault with complex rupture dynamics. During seismic quiescence, deep-seated sedimentary layers in Osaka Basin, which might be the main sources of radon, become less damaged and fractured. The reduction in damage leads to a decrease in radon exhalation to the atmosphere near the fault, causing the preseismic radon decrease in the atmosphere. Herein, we highlight the necessity of continuous monitoring of the atmospheric radon concentration, combined with statistical anomaly detection method, to evaluate future seismic risks.
format	article
author	Jun Muto Yumi Yasuoka Nao Miura Daichi Iwata Hiroyuki Nagahama Mitsuhiro Hirano Yoshiro Ohmomo Takahiro Mukai
author_facet	Jun Muto Yumi Yasuoka Nao Miura Daichi Iwata Hiroyuki Nagahama Mitsuhiro Hirano Yoshiro Ohmomo Takahiro Mukai
author_sort	Jun Muto
title	Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake
title_short	Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake
title_full	Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake
title_fullStr	Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake
title_full_unstemmed	Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake
title_sort	preseismic atmospheric radon anomaly associated with 2018 northern osaka earthquake
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3e88394ff1d24c18adcd5c31d065f72b
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Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake

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