1995年兵庫県南部地震の断層モデルと震源近傍における強振動シミュレーション  [in Japanese] A FAULT MODEL OF THE 1995 HYOGO-KEN NANBU EARTHQUAKE AND SIMULATION OF STRONG GROUND MOTION IN NEAR-SOURCE AREA  [in Japanese]

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Author(s)

    • 釜江 克宏 KAMAE Katsuhiro
    • Dept. of Nuclear Safety, Research, Research Reactor Institute, Kyoto University Dept. of Nuclear Safety,Research,Research Reactor Institute,Kyoto University
    • 入倉 孝次郎 IRIKURA Kojiro
    • Div. of Earthquake Disaster, Disaster Prevention Research Institute, Kyoto University Div.of Earthquake Disaster Prevention Research Institute,Kyoto University

Abstract

The 1995 Hyogo-ken Nanbu earthquake struck Kobe and adjacent cities, one of the most densely populated area in western Japan, and killed more than 6,400 people and destroyed more than 150,000 buildings and houses and tens of highway and railroad bridges. It is very important to examine the ground motion characteristics in the severely damaged area during the mainshock for understanding how buildings and bridges performed and why they reached collapse. Unfortunately very few strong ground motions were recorded in the severely damaged areas during the mainshock. In this study, we attempt to estimate ground motion at severely damaged sites by using the empirical Green's function method (EGF method). We derive a best source model with three asperities after several try and error with forward modeling by the EGF method. We estimate strong ground motions at sites, where the mainshock was not recorded, using aftershock records. The synthesized motions in the near-fault region in Kobe were characterized by two large long-period (1 to 3 seconds) pulses due to the forward rupture directivity. Peak horizontal acceleration and velocity of the synthesized motions at the heavily damaged sites are about 1,000 cm/sec^2 and 130 cm/sec, respectively, while those at a rock site in near-fault region show about 300 cm/sec^2 and 60 cm/sec. The reason why so strong motions hit the heavily damaged sites is that the large long-period pulses which come from two asperities in the Kobe-side segment of the fault were further amplified by the basin edge effects.

Journal

  • Journal of Structural and Construction Engineering (Transactions of AIJ)

    Journal of Structural and Construction Engineering (Transactions of AIJ) 62(500), 29-36, 1997

    Architectural Institute of Japan

References:  30

Cited by:  24

Codes

  • NII Article ID (NAID)
    110004303423
  • NII NACSIS-CAT ID (NCID)
    AN10438559
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1340-4202
  • NDL Article ID
    4323585
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-1419
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE  AIJ 
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