Multivariate analysis of damaged and undamaged embankment dams for irrigation in the Nojima Fault area due to the 1995 Hyogo-ken Nanbu earthquake

DOI
  • FUJII Hiroaki
    Okayama Prefectural Federation of Land Improvement Association, Professor Emeritus, Okayama University
  • NAMBA Akiyo
    ex. Faculty Agriculture of Okayama University
  • NISHIMURA Shin-ichi
    Graduate School of Emviromental and Life Science, Okayama University

Bibliographic Information

Other Title
  • 1995年兵庫県南部地震による野島断層領域の被害・無被害ため池の多変量解析

Abstract

This study tries to clarify the factors and mechanisms affecting the embankment dams that were either damaged (d) or undamaged (u) due to the earthquake on northern Awaji Island. Multivariate statistical analyses (including 10 or 11 items) were performed on 395 dams (d:112, u: 283) in the Nojima fault area (Nj) and on 1562 dams (d: 348, u: 1214) in the 5 Town area (5T). On the peaks of category score (CS) for main items, there are six angles to the epicenter (Nj: 10, 150, 30, 70, 100 and 130 deg. in the order of CS peak values, 5T: 100, 160, 140, 70, 40 and 10 deg.id.), seven angles to the fault (Nj: 100, 80, 20, 160, 40, 140 and 120deg..id.), one for the distance to epicenter (Nj・5T: 10 km), and two for the distance to the fault (Nj: －150 and 600 m). These results can be explained by the radiation patterns. When they are combined with the relation between the emphasized seismic waves ( P or SV: 45 and 135 deg, and SH: 0 and 90 deg., theoretical emergent angles to fault) and CS peak angles, they support secondary strong motion source As’ as well as the primary As near the epicenter.

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Keywords

Details 詳細情報について

  • CRID
    1390006973367065472
  • NII Article ID
    130008055381
  • DOI
    10.24762/jndsj.39.3_283
  • ISSN
    24341037
    02866021
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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