Precursory diffuse CO2 and H2S emission signatures of the 2011–2012 El Hierro submarine eruption, Canary Islands
Precursory diffuse CO2 and H2S emission signatures of the 2011–2012 El Hierro submarine eruption, Canary Islands
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2011-2012 年加那利群岛埃尔耶罗海底喷发的前兆扩散二氧化碳和硫化氢排放特征
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Í. Hernández
中科院分区：
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作者：
N. Pérez;G. Padilla;E. Padrón;P. Hernández;G. Melián;J. Barrancos;S. Dionis;D. Nolasco;F. Rodríguez;D. Calvo;Í. Hernández
2011年10月12日，耶罗岛以南拉雷斯廷加海岸2公里处开始发生海底喷发。CO2和H2S的土壤排放量连续测量期间的火山动荡，通过使用积累室方法在两个不同的地球化学站，HIE 01和HIE 07。记录的CO2和H2S流出物显示了海底喷发之前的异常信号。从8月下旬开始，二氧化碳排放量的时间序列在一个月内开始以相对恒定的速度增加，在海底火山爆发前一周达到最大值19 gm−2d−1。HIE 07的H2S流出时间序列显示，就在海底喷发开始前一天，H2S排放出现脉冲，达到峰值42 mg m-2 d-1，是观察期间记录的平均H2S流出量的10倍。由于CO2和H2S排放强烈受外部因素的影响，我们采用了多元回归分析，以消除他们的贡献。统计分析表明，滤波数据的长期趋势与地震能量有很好的相关性。我们发现，这些地球化学站是重要的监测站点，用于评估火山活动的耶罗岛，他们表现出的潜力，应用连续监测土壤中的CO2和H2S的流出，以改善和优化检测预警信号的未来火山动荡发作在耶罗岛。持续的扩散脱气研究可能会证明对监测其他火山在动荡时期是有用的。
On October 12, 2011, a submarine eruption began 2 km off the coast of La Restinga, south of El Hierro Island. CO2 and H2S soil efflux were continuously measured during the period of volcanic unrest by using the accumulation chamber method at two different geochemical stations, HIE01 and HIE07. Recorded CO2 and H2S effluxes showed precursory signals that preceded the submarine eruption. Beginning in late August, the CO2 efflux time series started increasing at a relatively constant rate over one month, reaching a maximum of 19 gm−2d−1 one week before the onset of the submarine volcanic eruption. The H2S efflux time series at HIE07 showed a pulse in H2S emission just one day before the initiation of the submarine eruption, reaching peak values of 42 mg m−2 d−1, 10 times the average H2S efflux recorded during the observation period. Since CO2 and H2S effluxes are strongly influenced by external factors, we applied a multiple regression analysis to remove their contribution. A statistical analysis showed that the long‐term trend of the filtered data is well correlated with the seismic energy. We find that these geochemical stations are important monitoring sites for evaluating the volcanic activity of El Hierro and that they demonstrate the potential of applying continuous monitoring of soil CO2 and H2S efflux to improve and optimize the detection of early warning signals of future volcanic unrest episodes at El Hierro. Continuous diffuse degassing studies would likely prove useful for monitoring other volcanoes during unrest episodes.