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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Geochemical signals related to the 2011-2012 El Hierro submarine eruption
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Geochemical signals related to the 2011-2012 El Hierro submarine eruption

机译：与2011-2012年El Hierro潜艇喷发有关的地球化学信号

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摘要

On 10 October 2011, a submarine volcanic eruption began 2 km south of the island of El Hierro (Canary Islands, Spain). It was the first eruption after 40 years of quiescence in the Canarian archipelago. Since mid July 2011, a multiparametric network has been deployed by the Institute Geografico Nacional (hereinafter IGN) to monitor volcanic processes. The data recorded by five stations, measuring the air and soil temperature, CO2 and radon concentration in the air inside four galleries and one well, are the focus of the present paper. Two important anomalies were found that improve comprehension of the volcanic process. First, a clear increase in CO2 concentration in one gallery (from 825 +/- 19 to 2305 +/- 35 ppm) which seems to be mainly controlled by ground deformation measured during the unrest period preceding the eruption. Second, a relationship between radon concentration in air in a well located in the northern side of the island with seismic energy release (several peaks with up to 115% increase), and ground deformation (50% growth in background level), also before the eruption onset. Lastly, changes in radon concentration during eruptive period seem to be modulated by seismic activity (increases up to 233%), which in turn is likely related to variations in magma rheology. (C) 2019 Elsevier B.V. All rights reserved.
机译：2011年10月10日，海底火山喷发开始于El Hierro岛（西班牙加那利群岛）以南2公里处。这是加那利群岛40多年的静止之后的第一次喷发。自2011年7月中旬以来，国家地理研究所（以下简称IGN）部署了多参数网络来监视火山过程。由五个站点记录的数据是测量四个画廊和一个井内的空气和土壤温度，CO2和ra浓度的数据，是本文的重点。发现了两个重要的异常现象，它们提高了对火山作用过程的理解。首先，一个通道中的CO2浓度明显增加（从825 +/- 19增至2305 +/- 35 ppm），这似乎主要是由喷发前的动荡时期测得的地面变形控制的。其次，岛上北部一口井中空气中的concentration浓度与地震能量释放（几个峰值，最高可达115％的增加）与地面变形（背景水平的50％的增加）之间的关系也是如此。爆发。最后，喷发期ra浓度的变化似乎受到地震活动的调节（增加了233％），这又可能与岩浆流变学有关。 （C）2019 Elsevier B.V.保留所有权利。

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