Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios

Abstract Subsurface structure survey based on horizontal-to-vertical (H/V) spectral ratios is widely conducted. The major merit of this survey is its convenience to obtain a stable result using a single station. Spatial variations of H/V spectral ratios are well-known phenomena, and it has been used...

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Autores principales:	Kyosuke Okamoto, Hiroshi Asanuma, Hiro Nimiya
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/71bf7f2be7a44697b243500a70617fbb
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id	oai:doaj.org-article:71bf7f2be7a44697b243500a70617fbb
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spelling	oai:doaj.org-article:71bf7f2be7a44697b243500a70617fbb2021-12-02T14:30:39ZFluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios10.1038/s41598-021-86775-12045-2322https://doaj.org/article/71bf7f2be7a44697b243500a70617fbb2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86775-1https://doaj.org/toc/2045-2322Abstract Subsurface structure survey based on horizontal-to-vertical (H/V) spectral ratios is widely conducted. The major merit of this survey is its convenience to obtain a stable result using a single station. Spatial variations of H/V spectral ratios are well-known phenomena, and it has been used to estimate the spatial fluctuation in subsurface structures. It is reasonable to anticipate temporal variations in H/V spectral ratios, especially in areas like geothermal fields, carbon capture and storage fields, etc., where rich fluid flows are expected, although there are few reports about the temporal changes. In Okuaizu Geothermal Field (OGF), Japan, dense seismic monitoring was deployed in 2015, and continuous monitoring has been consistent. We observed the H/V spectral ratios in OGF and found their repeated temporary drops. These drops seemed to be derived from local fluid activities according to a numerical calculation. Based on this finding, we examined a coherency between the H/V spectral ratios and fluid activities in OGF and found a significance. In conclusion, monitoring H/V spectral ratios can enable us to grasp fluid activities that sometimes could lead to a relatively large seismic event.Kyosuke OkamotoHiroshi AsanumaHiro NimiyaNature 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 Kyosuke Okamoto Hiroshi Asanuma Hiro Nimiya Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios
description	Abstract Subsurface structure survey based on horizontal-to-vertical (H/V) spectral ratios is widely conducted. The major merit of this survey is its convenience to obtain a stable result using a single station. Spatial variations of H/V spectral ratios are well-known phenomena, and it has been used to estimate the spatial fluctuation in subsurface structures. It is reasonable to anticipate temporal variations in H/V spectral ratios, especially in areas like geothermal fields, carbon capture and storage fields, etc., where rich fluid flows are expected, although there are few reports about the temporal changes. In Okuaizu Geothermal Field (OGF), Japan, dense seismic monitoring was deployed in 2015, and continuous monitoring has been consistent. We observed the H/V spectral ratios in OGF and found their repeated temporary drops. These drops seemed to be derived from local fluid activities according to a numerical calculation. Based on this finding, we examined a coherency between the H/V spectral ratios and fluid activities in OGF and found a significance. In conclusion, monitoring H/V spectral ratios can enable us to grasp fluid activities that sometimes could lead to a relatively large seismic event.
format	article
author	Kyosuke Okamoto Hiroshi Asanuma Hiro Nimiya
author_facet	Kyosuke Okamoto Hiroshi Asanuma Hiro Nimiya
author_sort	Kyosuke Okamoto
title	Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios
title_short	Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios
title_full	Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios
title_fullStr	Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios
title_full_unstemmed	Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios
title_sort	fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/71bf7f2be7a44697b243500a70617fbb
work_keys_str_mv	AT kyosukeokamoto fluidactivitydetectioningeothermalareasusingasingleseismicstationbymonitoringhorizontaltoverticalspectralratios AT hiroshiasanuma fluidactivitydetectioningeothermalareasusingasingleseismicstationbymonitoringhorizontaltoverticalspectralratios AT hironimiya fluidactivitydetectioningeothermalareasusingasingleseismicstationbymonitoringhorizontaltoverticalspectralratios
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Fluid activity detection in geothermal areas using a single seismic station by monitoring horizontal-to-vertical spectral ratios

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