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首页> 外文期刊>Pure and Applied Geophysics >Diffuse emission of hydrogen from Poas volcano, Costa Rica, America central
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Diffuse emission of hydrogen from Poas volcano, Costa Rica, America central

机译:来自美国中部哥斯达黎加波阿斯火山的氢扩散排放

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摘要

We report the results of four soil H-2 surveys carried out in 2000-2003 at Poas volcano, Costa Rica, to investigate the soil H-2 distribution and evaluate the diffuse H-2 emission as a potential surveillance tool for Poas volcano. Soil gas H-2 contents showed a wide range of concentration from 0.2 to 7,059 ppmV during the four surveys. Maps of soil gas H-2 based on Sequential Gaussian Simulation showed low H-2 concentration values in the soil atmosphere (<0.7 ppmV) for most of the study area, whereas high soil gas H-2 values were observed inside the active crater of Poas. A significant increase in soil gas H-2 concentration was observed inside the active crater during 2001 and 2002 with respect to year 2000, followed by a decrease in 2003. The observed spatial and temporal variations of soil H-2 concentration have been well correlated with seismicity, microgravimetry and fumarolic chemistry changes which occurred during this study. These observations evidence changes in the shallow magmatic-hydrothermal system of Poas, and it might be related to a potential magmatic intrusion during the period 1998-2004. Therefore, monitoring diffuse H-2 emission of Poas has become an important geochemical tool for the monitoring of its volcanic activity.
机译:我们报告了2000-2003年在哥斯达黎加的波阿斯火山进行的四次土壤H-2调查的结果,以调查土壤H-2的分布并评估弥散H-2的排放,以此作为对波阿斯火山的潜在监视工具。在四次调查中,土壤气体中H-2的浓度范围从0.2到7,059 ppmV。基于顺序高斯模拟的土壤气体H-2图谱显示,在大多数研究区域中,土壤大气中的H-2浓度值较低(<0.7 ppmV),而在活动火山口内的土壤气体中的H-2值较高。 Poas。与2000年相比,在2001年和2002年期间,活动火山口内部的土壤气体H-2浓度显着增加,随后在2003年有所下降。观测到的土壤H-2浓度的时空变化与降水的相关性很好。这项研究期间发生的地震活动性,微重力法和富马酸化学变化。这些观察结果证明了Poas浅层岩浆热液系统的变化,这可能与1998-2004年期间潜在的岩浆侵入有关。因此,监测波阿斯河扩散H-2的排放已成为监测其火山活动的重要地球化学工具。

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