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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Collateral variations between the concentrations of mercury and other water soluble ions in volcanic ash samples and volcanic activity during the 2014-2016 eruptive episodes at Aso volcano, Japan
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Collateral variations between the concentrations of mercury and other water soluble ions in volcanic ash samples and volcanic activity during the 2014-2016 eruptive episodes at Aso volcano, Japan

机译：2014-2016年日本麻生火山爆发期间火山灰样品中汞和其他水溶性离子的浓度与火山活动之间的附带变化

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During 2014-2016, the Aso volcano, located in the center of the Kyushu Islands, Japan, erupted and emitted large amounts of volcanic gases and ash. Two episodes of the eruption were observed; firstly Strombolian magmatic eruptive episodes from 25 November 2014 to the middle of May 2015, and secondly phreatomagmatic and phreatic eruptive episodes from September 2015 to February 2016. Bulk chemical analyses on total mercury (Hg) and major ions in water soluble fraction in volcanic ash fall samples were conducted. During the Strombolian magmatic eruptive episodes, total Hg concentrations averaged 1.69 +/- 0.87 ng g(-1) (N = 33), with a range from 0.47 to 3.8 ng g(-1). In addition, the temporal variation of total Hg concentrations in volcanic ash varied with the amplitude change of seismic signals. In the Aso volcano, the volcanic tremors are always observed during eruptive stages and quiet interludes, and the amplitudes of tremors increase at eruptive stages. So, the temporal variation of total Hg concentrations could provide an indication of the level of volcanic activity. During the phreatomagmatic and phreatic eruptive episodes, on the other hand, total Hg concentrations in the volcanic ash fall samples averaged 220 +/- 88 ng g(-1) (N = 5), corresponding to 100 times higher than those during the Strombolian eruptive episode. Therefore, it is possible that total Hg concentrations in volcanic ash samples are largely varied depending on the eruptive type. In addition, the ash fall amounts were also largely different among the two eruptive episodes. This can be also one of the factors controlling Hg concentrations in volcanic ash. (C) 2017 Elsevier B.V. All rights reserved.
机译：在2014年至2016年期间，位于日本九州群岛中心的麻生太郎火山喷发并排放了大量的火山气体和灰烬。观察到两次发作。首先是从2014年11月25日到2015年5月中旬的斯特伦伯利亚岩浆爆发事件，其次是从2015年9月到2016年2月的吞噬岩浆和潜水爆发事件。对火山灰中水溶性成分中的总汞（Hg）和主要离子的大量化学分析下降进行样品。在Strombolian岩浆爆发事件中，总Hg浓度平均为1.69 +/- 0.87 ng g（-1）（N = 33），范围从0.47到3.8 ng g（-1）。另外，火山灰中总汞浓度的时间变化随地震信号的振幅变化而变化。在阿苏火山中，总是在喷发阶段和平静的间断中观察到火山的震颤，并且在喷发阶段，震颤的幅度会增加。因此，总汞浓度的时间变化可以提供火山活动水平的指示。另一方面，在岩浆喷发和潜水爆发期间，火山灰掉落样品中的总Hg浓度平均为220 +/- 88 ng g（-1）（N = 5），比Strombolian时期高100倍。爆发发作。因此，火山灰样品中的总Hg浓度可能会根据喷发类型而有很大变化。此外，两次喷发之间的灰分下降量也有很大差异。这也是控制火山灰中汞浓度的因素之一。 （C）2017 Elsevier B.V.保留所有权利。

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