MISC

2007年12月

Soil H-2 and CO2 surveys at several active faults in Japan

PURE AND APPLIED GEOPHYSICS
  • Turhan Dogan
  • ,
  • Toshiya Mori
  • ,
  • Fumiaki Tsunomori
  • ,
  • Kenji Notsu

164
12
開始ページ
2449
終了ページ
2463
記述言語
英語
掲載種別
DOI
10.1007/s00024-007-0277-5
出版者・発行元
BIRKHAUSER VERLAG AG

Soil H-2 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 H-2 concentration in space and time and it seems that the maximum H-2 concentration at each active fault correlates with fault activity as exemplified by the time of the latest big earthquakes. Even though observed H-2 concentrations in four faults were markedly lower than those collected previously in the latter half of the 1970s, it is evident that the higher H-2 concentrations in this study are due to the addition of the fault gases. Comparing the chemical composition of trapped gases (H-2: 5-20% and CO2/H-2: 0.5-12) in fractured rocks of drill cores bored at the Nojima fault, a soil gas sample with the highest H-2 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 H-2 concentrations and lower CO2/H-2 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 H-2 concentrations in soil gases were observed.

Web of Science ® 被引用回数 : 8

リンク情報
DOI
https://doi.org/10.1007/s00024-007-0277-5
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000253683500006&DestApp=WOS_CPL
ID情報
  • DOI : 10.1007/s00024-007-0277-5
  • ISSN : 0033-4553
  • Web of Science ID : WOS:000253683500006

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