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首页> 外文期刊>Pure and Applied Geophysics >Soil H2 and CO2 Surveys at Several Active Faults in Japan
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Soil H2 and CO2 Surveys at Several Active Faults in Japan

机译：日本若干活动断层的土壤H2 和CO2 调查

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摘要

Soil H2 and CO2 surveys were carried out along seven active faults and around the aftershock region of the 2000 Tottori-ken Seibu earthquake in Japan. Diffuse CO2 effluxes were also measured along one fault and around the 2000 aftershock region. The results show highly variable H2 concentration in space and time and it seems that the maximum H2 concentration at each active fault correlates with fault activity as exemplified by the time of the latest big earthquakes. Even though observed H2 concentrations in four faults were markedly lower than those collected previously in the latter half of the 1970s, it is evident that the higher H2 concentrations in this study are due to the addition of the fault gases. Comparing the chemical composition of trapped gases (H2: 5–20% and CO2/H2: 0.5–12) in fractured rocks of drill cores bored at the Nojima fault, a soil gas sample with the highest H2 concentration showed large amounts of the trapped fault gas, diluted with atmospheric component. The profile experiment across a fracture zone at the Yamasaki fault showed higher H2 concentrations and lower CO2/H2 ratios as was observed in soil gas from the fracture zone. A few days after the 2000 Tottori-kei Seibu earthquake, no CO2 effluxes related to the occurrence of earthquakes were observed at the aftershock region. However, only above the epicenter zone, relatively high H2 concentrations in soil gases were observed.
机译：在日本2000年鸟取县西武地震的余震区域和7个活动断层附近对土壤H2 和CO2 进行了调查。还测量了一个断层和2000年余震区周围的扩散CO2 流量。结果表明，H2 的时空浓度变化很大，似乎每个活动断层的最大H2 浓度都与断层活动相关，如最近一次大地震的时间所示。即使在四个断层中观察到的H2 浓度明显低于1970年代后半期以前收集的H2 浓度，但很明显，这项研究中较高的H2 浓度是由于添加了断层所致气体。比较在野岛断裂处钻探​​的岩心（土壤气体）中截留的气体（H2 ：5–20％和CO2 / H2 ：0.5–12）的化学成分H2 浓度最高的样品显示出大量截留的断层气，并被大气成分稀释。在山崎断裂带断裂带的剖面试验表明，从断裂带的土壤气体中观察到的H2 浓度较高，而CO2 / H2 比率较低。 2000年鸟取溪西武地震发生几天后，在余震地区未观察到与地震发生有关的CO2泄漏。然而，仅在震中区以上，观察到土壤气体中的H2 浓度相对较高。

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  • 来源
    《Pure and Applied Geophysics》 |2007年第12期|2449-2463|共15页
  • 作者

    Turhan Dogan; Toshiya Mori; Fumiaki Tsunomori; Kenji Notsu;

  • 作者单位

    Laboratory for Earthquake Chemistry Graduate School of Science University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan;

    Laboratory for Earthquake Chemistry Graduate School of Science University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan;

    Laboratory for Earthquake Chemistry Graduate School of Science University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan;

    Laboratory for Earthquake Chemistry Graduate School of Science University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Active fault; soil H2; Co2 degassing; fault gas;

    机译：活动断层;土壤H2;Co2脱气;断层气;

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