Tomo Shibata

Kyoto University

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Fujio Akita

Fukuoka University

Yuji Sano

The University of Tokyo

Daniele L. Pinti

Université du Québec à Montréal

Naoto Takahata

The University of Tokyo

Takanori Kagoshima

The University of Tokyo

Heejun Yang

University of Toyama

Jun Shimada

Kumamoto University

Noritoshi Okazaki

Hokkaido Research Organization

Norio Matsumoto

Geological Survey of Japan

Ryuji Ikeda

University of Miyazaki

Cooperative Institutions

The University of Tokyo

Japan Agency for Marine-Earth Science and Technology

Hokkaido University

Tohoku University

Geological Survey of Japan

Kyoto University

United States Geological Survey

Sphere Institute

Earthquake Engineering Research Institute

University of Hawaii System

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Groundwater helium anomaly reflects strain change during the 2016 Kumamoto earthquake in Southwest Japan

Scientific Reports (2016)

Yuji Sano Naoto Takahata Takanori Kagoshima Tomo Shibata Tetsuji Onoue

Abstract Geochemical monitoring of groundwater and soil gas emission pointed out precursor and/or coseismic anomalies of noble gases associated with earthquakes, but there was lack of plausible physico-chemical basis. A laboratory experiment of rock fracturing and noble gas emission was conducted, but there is no quantitative connection between the laboratory results and observation in field. We report here deep groundwater helium anomalies related to the 2016 Kumamoto earthquake, which is an inland crustal earthquake with a strike-slip fault and a shallow hypocenter (10 km depth) close to highly populated areas in Southwest Japan. The observed helium isotope changes, soon after the earthquake, are quantitatively coupled with volumetric strain changes estimated from a fault model, which can be explained by experimental studies of helium degassing during compressional loading of rock samples. Groundwater helium is considered as an effective strain gauge. This suggests the first quantitative linkage between geochemical and seismological observations and may open the possibility to develop a new monitoring system to detect a possible strain change prior to a hazardous earthquake in regions where conventional borehole strain meter is not available.

Hypocenter

Strain gauge

Noble gas

Anomaly (physics)

10.1038/srep37939

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Citations (78)

Tectono‐magmatic processes investigated at deep‐water flanks of Hawaiian volcanoes

Eos (2000)

Jiro Naka Eitarô Takahasi David A. Clague M. O. Garcia Takeshi Hanyu

Hawaiian volcanoes are exceptional examples of intraplate hotspot volcanism. Hotspot volcanoes, which frequently host large eruptions and related earthquakes, flank‐failure landslides, and associated tsunamis, can present severe hazards to populated regions. Many studies have focused on subaerial parts of Hawaiian volcanoes, but the deep‐water flanks of the edifices, which can reach 5700 m below sea level, remain poorly understood because they are so inaccessible. In 1998 a collaborative program between Japan and the United States was initiated to explore the evolution of Hawaiian volcanoes, including their growth and degradation.

Subaerial

Hotspot (geology)

Submarine volcano

10.1029/00eo00152

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Citations (29)

Stable and noble gas isotopic study of geothermal and ground waters in North Hokkaido, Japan

Geochimica et Cosmochimica Acta (2006)

Akira Ueda Satoko Shimoda Keisuke Nagao Tomo Shibata Takahiro Suzuki

Noble gas

Isotope Analysis

10.1016/j.gca.2006.06.1270

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Citations (1)

Hydrological and geochemical change related to volcanic activity of Usu volcano, Japan

Journal of Volcanology and Geothermal Research (2008)

Tomo Shibata Fujio Akita Wataru Hirose Ryuji Ikeda

Stratovolcano

Caldera

Fumarole

Phreatic eruption

10.1016/j.jvolgeores.2007.12.040

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Citations (13)

Long-term changes in unconfined groundwater level in the southern Beppu volcanic fan

Journal of Groundwater Hydrology (2021)

Heejun Yang Tomo Shibata

Transition in effective precipitation, land use change and discharge of hot spring reveals the long term changes in the unconfined groundwater level in the southern Beppu volcanic fan from 1971 to 2019. The unconfined groundwater level was periodically fluctuated between 40 m and 50 m above sea level and indicated the maximum value in October or November and the minimum value in April or May. Annual effective precipitation was related to the maximum groundwater level in each year and it had decreased 0.7 mm every year. The urban area was slightly increased from the 1970s to 2016, but it was not a factor to decrease the unconfined groundwater level. The hot spring yield was inversely related to the maximum groundwater level in each year and it had increased 7.9 mm/y, which is approximately 11 times higher than the effective precipitation. Thus, it could conclude that the increase of the hot spring yield mainly affected the decline of the unconfined groundwater level from 1971 to 1999.

Hot spring

10.5917/jagh.63.151

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Contribution of slab melting and slab dehydration to magmatism in the Japanese arc

Geochimica et Cosmochimica Acta (2006)

Takeshi Hanyu Yoshiyuki Tatsumi S. Nakai Qing Chang Takashi Miyazaki

Slab

10.1016/j.gca.2006.06.462

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Citations (4)

The bromine and chlorine isotopic composition of the mantle as revealed by deep geothermal fluids

Geochimica et Cosmochimica Acta (2020)

Daniele L. Pinti Orfan Shouakar‐Stash M. Clara Castro Aída López-Hernández Chris M. Hall

Isotopes of chlorine

Fumarole

Radiogenic nuclide

10.1016/j.gca.2020.02.028

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Citations (18)

Estimating freshwater salinization and carbonate rock weathering in Minami-Daito Island, Okinawa Prefecture, Japan

Japan Geoscience Union (2020)

Heejun Yang Makoto Kagabu Azusa Okumura Jun Shimada Tomo Shibata

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Coseismic Groundwater Drawdown Along Crustal Ruptures During the 2016 M_w 7.0 Kumamoto Earthquake

Water Resources Research (2019)

Takahiro Hosono Chisato Yamada Tomo Shibata Yasuhiro Tawara Chi‐Yuen Wang

Abstract Groundwater‐level changes after earthquakes provide insight into changes in hydrogeological properties such as permeability and pore pressure. Quantifying such changes, both their location and magnitude, is usually hindered by limited data. Using extensive high‐resolution water‐level monitoring records, we provide direct evidence of significant groundwater drawdown (4.74‐m maximum) over a 160‐km 2 area along crustal ruptures after the M w 7.0, 2016, Kumamoto earthquake. Approximately 10 6 m 3 of water disappeared within 35 min after the main shock. The loss of water was not caused by static‐strain driven pore‐pressure decrease nor by releasing of water through structural pathways, but most likely by water transfer downwards through open cracks. Such changes may impact the security of water resources, the safety of underground waste repositories, and contaminant transport in seismically active areas.

Drawdown (hydrology)

10.1029/2019wr024871

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Citations (87)

Coseismic change in groundwater level after the 2016 Kumamoto earthquake

Japan Geoscience Union (2018)

Takahiro Hosono Chisato Yamada Tomo Shibata Yasuhiro Tawara Jun Shimada

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Citations (0)