伏在断層の地震危険度調査手法について

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タイトル別名
  • Investigation Methods for Seismic Hazard Assessments of Active Concealed Faults.
  • フクザイ ダンソウ ノ ジシン キケンド チョウサ シュホウ ニ ツイテ

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This paper summarizes the characteristics of crustal movements associated with concealed faults, and discusses the application of some methods for seismic hazard assessments of concealed faults.<BR>Many active concealed faults occur under active folding in the thick Neogene distributed area, especially Inner zone of Northeast Japan Arc, and they are significant sources of medium to large earthquakes.<BR>An activity of concealed fault (fold earthquake) makes an uplifting with assynmmetrical folding. The width of uplifted area is roughly same to depth of the bottom of fault, and anticline have steep limb on the fault tip side. An faulting on a bending fault makes a complex anticlinorium which have short wave- length fold axes and/or structural terraces and steep dipping zone.<BR>Such activities of concealed faults shall be recorded in the surface (Holocene) sediments and terraces crossing active anticlines. Thus clino- unconformities in the Holocene layers and differentiated terraces shall provide quantitative and essential data for restoring the paleo- seismicities on the concealed faults. But these methods are not applicable to the faults that lies under thick layers (fault tip located about 1km or more deep part of upper crust), or locates in the mountainous region where initial gradient of alluvial plain is steeper than the gradient of tilting accompanied with one faulting. In this case, the other pale- seismic records such as secondary faults, fossils indicating pale- sea level, emerged benches, pale-liquefaction, and the like. Each method, however, is not of wide application, thus synthetic judgments on some methods are needed to seismic hazard assessments.<BR>The 3- dimensional features and slip distribution on the concealed (reverse) faults can be estimated from the surface and underground geologic structures and terrace deformations, so we may be able to provide effective information for estimation of strong ground motion on the basis of geologic and geomorphologic studies of active folding.

収録刊行物

  • 応用地質

    応用地質 40 (2), 60-69, 1999

    一般社団法人 日本応用地質学会

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