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Diffuse Emission of Hydrogen from Poás Volcano, Costa Rica, America Central

机译:来自美国中部哥斯达黎加波亚斯火山的氢扩散排放

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摘要

We report the results of four soil H2 surveys carried out in 2000–2003 at Poás volcano, Costa Rica, to investigate the soil H2 distribution and evaluate the diffuse H2 emission as a potential surveillance tool for Poás volcano. Soil gas H2 contents showed a wide range of concentration from 0.2 to 7,059 ppmV during the four surveys. Maps of soil gas H2 based on Sequential Gaussian Simulation showed low H2 concentration values in the soil atmosphere (<0.7 ppmV) for most of the study area, whereas high soil gas H2 values were observed inside the active crater of Poás. A significant increase in soil gas H2 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 H2 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 Poás, and it might be related to a potential magmatic intrusion during the period 1998–2004. Therefore, monitoring diffuse H2 emission of Poás has become an important geochemical tool for the monitoring of its volcanic activity.
机译:我们报告了2000-2003年在哥斯达黎加波阿斯火山进行的四次土壤H2 调查的结果,以调查土壤H2 的分布并评估弥散H2 的排放,以此作为一种潜在的监测手段Poás火山的工具。在四次调查中,土壤气体中的H2 含量显示出从0.2至7,059 ppmV的宽范围浓度。基于顺序高斯模拟的土壤气体H2 图显示,在大多数研究区域中,土壤大气中的H2 浓度值较低(<0.7 ppmV),而土壤H2 值较高。在活跃的波阿斯火山口内观察到。与2000年相比,2001年和2002年活动火山口内部的土壤H2 浓度显着增加,2003年有所下降。观察到的土壤H2 的时空变化具有与本研究中发生的地震活动性,微重力法和富马酸化学变化有很好的相关性。这些观察结果表明波阿斯岛浅层岩浆热液系统发生了变化,这可能与1998-2004年期间潜在的岩浆侵入有关。因此,监测波阿斯的扩散H2 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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