Volcanic Activity Forecast Based on Volcanic Gas Composition of Hakone Volcano, Japan: Utilization for Volcanic Disaster Prevention

IF 0.2 Q4 GEOGRAPHY, PHYSICAL Journal of Geography-Chigaku Zasshi Pub Date : 2021-12-25 DOI:10.5026/jgeography.130.783
Yasushi Daita, T. Ohba, Muga Yaguchi, Takao Sogo, M. Harada
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引用次数: 2

Abstract

Earthquake swarms have occurred with volcanism repeatedly at Hakone volcano in Kanagawa prefecture, Japan. In 2015, a phreatic eruption took place about two months after the start of an earthquake swarm. Hakone volcano is a popular tourist destination. If it is possible to forecast at the early stages of an earthquake swarm whether or not an eruption will occur, the forecast could contribute to preventing disasters involving tourists. At Hakone volcano, increases in the ratio of components (CO2 /H2S) contained in the volcanic gas from fumaroles were observed in synchronization with earthquake swarms and ground deformation in 2013 and 2015. Similar increases in CO2 /H2S ratio were also observed in 2017 and 2019, although the increases in the CO2 /H2S ratio in 2017 and 2019 were not as sharp as those in 2013 and 2015. Furthermore, the maximum values of the CO2 /H2S ratio in 2017 and 2019 were lower than the values in 2013 and 2015. These differences in the CO2 /H2S ratio may be related to the limited and smaller scale of volcanic activity in 2017 and 2019 relative to 2013 and 2015. Another explanation for the difference is a possible irreversible change in the underground structure of the Owakudani area, which is a geothermal area around Hakone volcano, because the phreatic eruption took place in the Owakudani area in 2015. During all four seismically active periods in 2013, 2015, 2017, and 2019, the CO2 /H2S ratio decreased simultaneously with decreases in the number of volcanic earthquakes. The lower limit of CO2 /H2S ratios after the peak of the CO2 /H2S ratio time series was about 20 in all periods. This implies that subsequent unrest would not start until the CO2 /H2S ratio drops to about 20. The CO2 /H2S ratio might be an effective tool for forecasting activity at Hakone volcano. During the active periods in 2013, 2015, 2017, and 2019, extensions * 神奈川県環境科学センター ** 東海大学理学部化学科 *** 気象庁気象研究所火山研究部 **** 神奈川県温泉地学研究所 * Kanagawa Environmental Research Center, Hiratsuka, 254-0014, Japan ** Department of Chemistry, School of Science, Tokai University, Hiratsuka, 259-1292, Japan *** Department of Volcanology Research, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, 305-0052, Japan **** Hot Springs Research Institute of Kanagawa Prefecture, Odawara, 250-0031, Japan 地学雑誌 Journal of Geography(Chigaku Zasshi) 130(6)783­796 2021 doi:10.5026/jgeography.130.783
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基于箱根火山火山气体成分的火山活动预测——用于火山灾害预防
日本神奈川县箱根火山多次发生地震群和火山活动。2015年,在地震群开始大约两个月后,发生了一次潜水喷发。箱根火山是一个受欢迎的旅游目的地。如果能够在地震群的早期预测是否会爆发,那么该预测可能有助于预防涉及游客的灾害。在箱根火山,2013年和2015年,观察到来自喷气孔的火山气体中所含成分(CO2/H2S)的比例与地震群和地面变形同步增加。2017年和2019年也观察到了类似的CO2/H2S比率的增加,尽管2017年和2017年的CO2/硫化氢比率的增加没有2013年和2015年那么剧烈。此外,2017年和2019年的CO2/H2S比率最大值低于2013年和2015年的值。CO2/H2S比率的这些差异可能与2017年和2019年火山活动相对于2013年和2015年的有限和较小规模有关。对这种差异的另一种解释是,Owakudani地区的地下结构可能发生了不可逆转的变化,Owaku dani地区是箱根火山周围的地热区,因为2015年潜水喷发发生在Owakudani地区。在2013年、2015年、2017年和2019年的四个地震活跃期,CO2/H2S比率随着火山地震次数的减少而同时下降。在CO2/H2S比率时间序列的峰值之后,CO2/H2S的比率的下限在所有时段中为约20。这意味着在CO2/H2S比率降至约20之前不会开始随后的动乱。CO2/H2S比值可能是预测箱根火山活动的有效工具。在2013年、2015年、2017年和2019年的活跃期内,延期*神奈川県環境科学センター ** 東海大学理学部化学科 *** 気象庁気象研究所火山研究部 **** 神奈川県温泉地学研究所 * 神奈川环境研究中心,平冢,254-0014,日本***东海大学理学院化学系,平冢259-1292,日本***日本气象厅气象研究所火山学研究部,筑波305-0052,日本***神奈川县温泉研究所,小田原250-0031地学雑誌 地理杂志(Chigaku Zasshi)130(6)783­796 2021 doi:10.5026/jgeography.130.783
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CiteScore
1.50
自引率
33.30%
发文量
28
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