活断層の分布形態と破壊過程 Geometry of Active Faults and Their Rupture Process

この論文にアクセスする

この論文をさがす

著者

    • 鈴木 康弘 SUZUKI Yasuhiro
    • 愛知県立大学情報科学部地域情報科学科 Laboratory of Geoscience, Information Science and Technology, Aichi Prefectural University

抄録

活断層の情報として,最も基本的な情報である地表分布形態のうち,断層の分岐形態,横ずれ断層の縦ずれ変位分布パターン,断層線に沿った変位の累積過程は,断層の破壊過程に密接に関連し,地震動予測のために不可欠な情報源となることを予測する.また,これまで地震発生前には不可能であった破壊開始点や破壊伝播方向の予測やセグメント区分および活断層の発生に関して,新たな視点を提示する.

Physical characteristics are often used for fault segmentation, when historical and/or paleoseismological data are not sufficient to reveal coseismic behavior of faults. This paper proposes a method to identify the directivity of rupture propagation based on the branching features of active fault traces. An interdependent correlation between the branching direction of the surface ruptures and the direction of their propagation is often observed for recent earthquake fault ruptures. Geographical patterns of active faults are the results of repeated earthquake faulting, and therefore branching of active faults leads us to suggest that the direction of rupture propagation is predictable before the active faults generate earthquakes in the future. We propose that branching of faults and characteristic patterns of vertical-slip distribution along strikeslip faults can be used to identify fault segmentation. In a case where the branches of the two faults face each other, we may suspect the presence of a segmentation boundary and a change in the direction of fault ruptures between these branches. Regarding the characteristic pattern of vertical-slip distribution along strike-slip faults, the upthrown sides along strike-slip faults are, in general, located on the fault blocks in the direction of relative strike-slip. For example, along an E-Wtrending right-lateral strike-slip fault, upthrown sides are located on the north in the eastern section and on the south in the western section. Therefore, a fault segment may be identified based on a set of the vertical slip distribution.<br>Cumulative fault slip distributions along fault traces are also good indicators of the past rupture process. Most of the existing active faults in Japan show the characteristic earthquake pattern in Fig. 3-A; and only the Kochien fault in Hokkaido shows the pattern in Fig. 3-B, indicating that this fault was generated after formation of the Middle terrace. None of the active faults has the pattern in Fig. 3-C, and this indicates that active faults have not much expanded their extension by repeated movements.

収録刊行物

  • 第四紀研究  

    第四紀研究 39(4), 401-405, 2000-08-01 

    Japan Association for Quaternary Research

参考文献:  11件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

被引用文献:  1件

被引用文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10004720770
  • NII書誌ID(NCID)
    AN0034136X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04182642
  • NDL 記事登録ID
    5427761
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-67
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
ページトップへ