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タイトル: 科学掘削による地震断層の応力状態・物性・すべりパラメーターの評価
その他のタイトル: Evaluation of stress state, physical property and rupturing behavior of seismogenic faults by scientific drillings
著者: 林, 為人  kyouindb  KAKEN_id
廣瀬, 丈洋  KAKEN_name
谷川, 亘  KAKEN_name
濱田, 洋平  KAKEN_name
著者名の別形: LIN, Weiren
HIROSE, Takehiro
TANIKAWA, Wataru
HAMADA, Yohei
キーワード: 地震断層
応力
浸透率
摩擦係数
温度
熱物性
seismogenic fault
stress state
permeability
frictional coefficient
temperature
thermal property
発行日: 2017
出版者: 東京地学協会
誌名: 地学雑誌 = Journal of Geography(Chigaku Zasshi)
巻: 126
号: 2
開始ページ: 223
終了ページ: 246
抄録: To better understand seismic fault rupturing mechanisms, recent research results from scientific ocean drilling projects in seismogenic subduction zones such as Japan Trench and Nankai Trough carried out under the International Ocean Discovery Program (IODP) are reviewed and summarized. Stress states in the vicinity of faults and in wall rocks penetrated by drillings are determined or constrained using borehole wall resistivity images and drill core samples. The stress measurement methods are summarized and the stress results are interpreted. Fluid transportation properties and thermal properties within and around the faults are determined from retrieved core samples. The results are both useful and necessary for examining fault rupturing lubrication mechanisms, e.g., coseismic thermal pressurization. Dynamic frictional behavior of fault gouges is elucidated through rotary frictional experiments over a wide range from intermediate to high velocities covering the real coseismic fault slip velocity at around 1 m/s; the results indicate that frictional coefficients of plate boundary fault gouges in subduction zones are very low. In addition, high-temperature history examined with vitrinite reflectance measurements and minor element movements from isotopic analyses using the fault core samples give important evidence of the frictional heat of faults. Such historic high-temperature signals also enable inversion estimations to reveal past fault-rupturing parameters. It is hoped this review paper will be valuable and helpful for planning and implementing future scientific fault drilling programs.
記述: 特集号:沈み込む海洋プレート科学の最前線 --アウターライズ海洋掘削に向けて--
著作権等: © 2017 公益社団法人 東京地学協会
発行元の許可を得て登録しています.
URI: http://hdl.handle.net/2433/226990
DOI(出版社版): 10.5026/jgeography.126.223
出現コレクション:学術雑誌掲載論文等

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