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A review on volcanic gas compositions related to volcanic activities and non-volcanological effects

机译：与火山运动和非暴力效应相关的火山气体组合物综述

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Volcanic gases have been monitored to predict eruptions since their compositions are strongly affected by volcanic activities. Here, volcanic gas geochemistry is reviewed with the main focus placed on the potential use of volcanic gases as eruption precursors. First, volcanic activities are differentiated into four eruptive cycles: eruptive, post-eruptive, inter-eruptive, and pre-eruptive periods. Second, we discuss geochemical factors affecting volcanic gas compositions: magma origin and degassing, hydrothermal interactions, and meteorological variability. Third, volcanic gas data in previous studies are revisited to address the practical aspects in utilizing volcanic gas compositions to predict eruptions. As a magma is depressurized due to its uprising, volcanic gases become progressively exsolved. Generally, the fluxes of volcanic gases (e.g., CO2, SO2, H2S, etc.) increase considerably close to eruptions. Also, CO2/SO2, SO2/HCl, and SO2/HF ratios in volcanic gases tend to decrease at the imminence of eruptions. Nonetheless, such trends may not be encountered due to both kinetically limited degassing and secondary effects including hydrothermal interactions and meteorological variability. Due to the site specificity of the aforementioned effects, a comprehensive understanding of volcanic gas chemistry requires the knowledge of magma vents and reservoirs as well as hydrothermal systems below volcanoes. Accordingly, the integrated use of volcanic gas data with geophysical and geomorphological information can warrant a better prediction of eruptions.
机译：已经监测火山气体以预测喷发，因为它们的组成受火山活动的强烈影响。在这里，Volcanic Gairoomistics通过主焦点进行了审查，该主要重点放在潜在使用火山气体作为喷发前体。首先，火山活动分为四个喷发循环：喷发，喷发后，爆发性和喷发前的时期。其次，我们讨论影响火山气体组成的地球化学因素：岩浆起源和脱气，水热相互作用和气象变异性。第三，预先访问先前研究中的火山气体数据以解决利用火山气体组合物预测爆发的实际方面。由于岩浆由于其起义而减压，火山气体变得逐渐渗透。通常，火山气体（例如，CO 2，SO2，H 2 S等）的助熔剂增加到爆发。此外，在火山气体中的CO 2 / SO2，SO2 / HCl和SO2 / HF比倾向于爆发的侵入症。尽管如此，由于动力学脱气和次要效应，包括水热相互作用和气象变异性，可能不会遇到这种趋势。由于上述效果的现场特异性，对火山气体化学的全面了解需要岩浆通风口和水库以及海葵低于火山的水热系统。因此，具有地球物理和地貌信息的火山气体数据的综合使用可以保证对爆发的更好预测。

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