Radon degassing triggered by tidal loading before an earthquake

Abstract The presence of anomalous geochemical changes related to earthquakes has been controversial despite widespread, long time challenges for earthquake prediction. Establishing a quantitative relationship among geochemical changes and geodetical and seismological changes can clarify their hidde...

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Autores principales:	Yasutaka Omori, Hiroyuki Nagahama, Yumi Yasuoka, Jun Muto
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cbc7c12eeb894746a54fde824fc77382
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spelling	oai:doaj.org-article:cbc7c12eeb894746a54fde824fc773822021-12-02T14:21:54ZRadon degassing triggered by tidal loading before an earthquake10.1038/s41598-021-83499-02045-2322https://doaj.org/article/cbc7c12eeb894746a54fde824fc773822021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83499-0https://doaj.org/toc/2045-2322Abstract The presence of anomalous geochemical changes related to earthquakes has been controversial despite widespread, long time challenges for earthquake prediction. Establishing a quantitative relationship among geochemical changes and geodetical and seismological changes can clarify their hidden connection. Here we determined the response of atmospheric radon (222Rn) to diurnal tidal (K1 constituent) loading in the reported 11-year-long variation in the atmospheric radon concentration, including its anomalous evolution for 2 months before the devastating 1995 Kobe earthquake in Japan. The response to the tidal loading had been identified for 5 years before the occurrence of the earthquake. Comparison between these radon responses relative to crustal strain revealed that the response efficiency for the diurnal K1 tide was larger than that for the earthquake by a factor of 21–33, implying the involvement of crustal fluid movement. The radon responses occurred when compressional crustal stress decreased or changed to extension. These findings suggest that changes in radon exhaled from the ground were induced by ascent flow of soil gas acting as a radon carrier and degassed from mantle-derived crustal fluid upwelling due to modulation of the crustal stress regime.Yasutaka OmoriHiroyuki NagahamaYumi YasuokaJun MutoNature 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 Yasutaka Omori Hiroyuki Nagahama Yumi Yasuoka Jun Muto Radon degassing triggered by tidal loading before an earthquake
description	Abstract The presence of anomalous geochemical changes related to earthquakes has been controversial despite widespread, long time challenges for earthquake prediction. Establishing a quantitative relationship among geochemical changes and geodetical and seismological changes can clarify their hidden connection. Here we determined the response of atmospheric radon (222Rn) to diurnal tidal (K1 constituent) loading in the reported 11-year-long variation in the atmospheric radon concentration, including its anomalous evolution for 2 months before the devastating 1995 Kobe earthquake in Japan. The response to the tidal loading had been identified for 5 years before the occurrence of the earthquake. Comparison between these radon responses relative to crustal strain revealed that the response efficiency for the diurnal K1 tide was larger than that for the earthquake by a factor of 21–33, implying the involvement of crustal fluid movement. The radon responses occurred when compressional crustal stress decreased or changed to extension. These findings suggest that changes in radon exhaled from the ground were induced by ascent flow of soil gas acting as a radon carrier and degassed from mantle-derived crustal fluid upwelling due to modulation of the crustal stress regime.
format	article
author	Yasutaka Omori Hiroyuki Nagahama Yumi Yasuoka Jun Muto
author_facet	Yasutaka Omori Hiroyuki Nagahama Yumi Yasuoka Jun Muto
author_sort	Yasutaka Omori
title	Radon degassing triggered by tidal loading before an earthquake
title_short	Radon degassing triggered by tidal loading before an earthquake
title_full	Radon degassing triggered by tidal loading before an earthquake
title_fullStr	Radon degassing triggered by tidal loading before an earthquake
title_full_unstemmed	Radon degassing triggered by tidal loading before an earthquake
title_sort	radon degassing triggered by tidal loading before an earthquake
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/cbc7c12eeb894746a54fde824fc77382
work_keys_str_mv	AT yasutakaomori radondegassingtriggeredbytidalloadingbeforeanearthquake AT hiroyukinagahama radondegassingtriggeredbytidalloadingbeforeanearthquake AT yumiyasuoka radondegassingtriggeredbytidalloadingbeforeanearthquake AT junmuto radondegassingtriggeredbytidalloadingbeforeanearthquake
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Radon degassing triggered by tidal loading before an earthquake

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