Studies on diffuse emission of volcanic volatiles in a monogenetic volcano area

单生火山区火山挥发分扩散排放研究

• 批准号: 23540569
• 负责人: NOTSU Kenji
• 金额: $ 3.24万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23540569/
• 关键词: 火山噴火予知; 単成火山; 伊豆東部火山群; 手石海丘; 大室山; 火山ガス拡散放出; マグマ揮発性物質; 炭素同位体比; 二酸化炭素

Magmatic volatiles are released not only as plume efflux from summit craters or flank fumaroles but also as diffuse efflux from whole surface of volcanic body. This work tried to monitor the behavior of magma beneath monogenetic volcanoes of the Izu-Tobu volcanoes by means of diffuse degassing of magmatic volatiles. From the bottom of the summit crater of the Teishi Knoll, formed at the 1989 submarine eruption, extremely trace amounts of magmatic-hydrothermal CO2 and CH4 were detected, by means of precise chemical and isotopic analyses of seawater collected just on the crater bottom. No diffuse degassing of magmatic CO2 was observed at the land area of epicenter regions of recent earthquake swarms nor at the fissure eruption region formed 2700 years before. At Oh-muro-yama scoria cone formed 4000 years before, CO2 efflux was slightly higher in the summit crater, the total efflux was (22+2) ton/day.

岩浆挥发分不仅以顶端火山口或侧翼喷发气孔的羽流形式释放，而且以整个火山体表面的扩散喷发形式释放。这项工作试图通过岩浆挥发分的扩散脱气来监测伊豆-托布火山单生火山下的岩浆行为。从1989年海底喷发时形成的铁石坑顶端火山口的底部，通过对火山口底部收集的海水进行精确的化学和同位素分析，发现了极其微量的岩浆热液CO2和CH4。在现代震群震中区和2700年前形成的裂隙喷发区的陆地上，没有观察到岩浆二氧化碳的扩散脱气。在距今4000年前形成的天目山火山口，顶端火山口的CO2排放略高，总排放为(22+2)吨/天。

项目成果

Relation between single very-long -period seismic pulses and volcanic gas emission at Mt. Asama

浅间山单次极长周期地震脉冲与火山气体喷发的关系

• 作者: Kazahaya R.;Mori T.;Takeo M.;Ohminato T.;Urabe T. and Maeda Y
• 通讯作者: Urabe T. and Maeda Y

新元素発見を夢見て-日本の無機化学を築いた「柴田雄次」と新元素

发现新元素的梦想——日本无机化学奠基人柴田雄二与新元素

• 发表时间: 2011
• 期刊: 化学
• 作者: 塩満栄一;迫田達也;野津憲治
• 通讯作者: 野津憲治

Leakage of magmatic-hydrothermal volatiles from a crater bottom formed by a submarine eruption in 1989 at Teishi Knoll, Japan.

1989 年日本 Teishi Knoll 海底喷发形成的火山口底部岩浆热液挥发物泄漏。

• DOI: 10.1016/j.jvolgeores.2013.11.017
• 发表时间: 2014
• 期刊: Journal of Volcanology and Geothermal Research
• 影响因子: 2.9
• 作者: Notsu K.;Sohrin R.;Wada H.;Tsuboi T.;Sumino H.;Mori T. Tsunogai U.;Hernandez P.A.;Suzuki Y.;Ikuta R.;Oorui K.;Koyama M.;Masuda T. and Fujii N.
• 通讯作者: Masuda T. and Fujii N.

Precursory gas flux change observed before eruptions at Suwanosejima volcano

诹访之岛火山喷发前观测到的前兆气体通量变化

• 作者: Mori T.;Iguchi M.;Nishimura T. and Oikawa J
• 通讯作者: Nishimura T. and Oikawa J

同位体環境分析

同位素环境分析

• 发表时间: 2013
• 作者: A. Pandey;K. Nakamura and H. Sugai;野津憲治（分担執筆）
• 通讯作者: 野津憲治（分担執筆）