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Hydrochemical and Hydroacoustic Investigation of the Yugama Acid Crater Lake, Kusatsu-Shirane, Japan
https://nied-repo.bosai.go.jp/records/5766
https://nied-repo.bosai.go.jp/records/57663214077a-c12c-40c2-99bc-655e7219308c
| Item type | researchmap(1) | |||||||||||||||||||||||||
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| 公開日 | 2023-07-24 | |||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||
| タイトル | Hydrochemical and Hydroacoustic Investigation of the Yugama Acid Crater Lake, Kusatsu-Shirane, Japan | |||||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||||
| 言語 | eng | |||||||||||||||||||||||||
| 著者 |
Pedro A. Hernandez
× Pedro A. Hernandez
× Kenji Nogami
× Eleazar Padron
× Luis Somoza
× Cecilia Amonte
× Toshiya Mori
× Gladys V. Melian
× Hirochicka Sumino
× Yoshikazu Kikawada
× Nemesio M. Perez
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| 抄録 | ||||||||||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||||||||||
| 内容記述 | The gases dissolved in the waters of volcanic lakes can present a serious hazard if the physical-chemical conditions change due to variations in the supply of magmatic gases. The monitoring of gases such as CO<sub>2</sub> and He help us understand the degassing process and their connection with magmatic/hydrothermal system. One of the most acidic volcanic lakes on the planet is the Yugama, on Kusatsu Shirane volcano (Japan). We report the results of an interdisciplinary study carried out in August 2013 at Yugama consisting of the first estimation of rate of diffuse CO<sub>2</sub> emission, the chemical and isotopic analysis of water and dissolved gases in samples from vertical lake profiles, and an echo-sounding survey. The lake water has an average temperature of 24-25°C, pH 1.01, concentrations of SO<sub>4</sub><sup>2-</sup> between 1,227 and 1,654?mgL<sup>?1</sup> and Cl<sup>?</sup> between 1,506 and 2,562?mgL<sup>?1</sup>, with gas bubbling at several locations and floating sulfur globules with sulfide inclusions. A total of 66 CO<sub>2</sub> efflux measurements were taken at the lake surface by means of the floating accumulation chamber method to estimate the diffuse CO<sub>2</sub> output from the studied area. CO<sub>2</sub> efflux values ranged from 82 up to 25,800?g?m<sup>?2</sup> d<sup>?1</sup>. Estimation of the diffuse CO<sub>2</sub> emission at Yaguma Crater Lake was 30 ± 12?t?d<sup>?1</sup>. Normalized CO<sub>2</sub> emission rate (assuming an area of 0.066?km<sup>2</sup>) was 454?t?km<sup>?2</sup> d<sup>?1</sup>, a value within the range of acid volcanic lakes. Vertical profiles of major ions and dissolved gases showed variations with increases in ion content and dissolved CO<sub>2</sub> and He with depth. Acoustic imaging shows the presence of intense bubbling and provides important information on the bathymetry of the lake. The 50?200?kHz echograms exhibit frequent vertical plumes of rising gas bubbles. Within the crater-lake, three circular submarine vents have been identified showing flares due to a significant activity of sublacustrine emissions. This work shows the first data of diffuse CO<sub>2</sub> degassing, dissolved gases in water and echosounding (ES) from Yugama Crater Lake. Periodic hydrogeochemical and hydroacoustic surveys at Yugama Crater Lakemay thus help to document changes in the state of activity of this high-risk volcanic area. | |||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||
| 書誌情報 |
en : Frontiers in Earth Science 巻 9, p. 741795, 発行日 2021-12-17 |
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| 言語 | en | |||||||||||||||||||||||||
| 出版者 | Frontiers Media SA | |||||||||||||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||||||||||||
| 収録物識別子 | 2296-6463 | |||||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||||
| 関連識別子 | 10.3389/feart.2021.741795 | |||||||||||||||||||||||||
