Relationship between Damage of Buildings caused by Hyogo-ken Nanbu Earthquake and Landforms, and relationship between the Damage and Ages of Residential Development. A Case Study on Takarazuka City.

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  • 兵庫県南部地震による建物被害と地形および宅地化年代の関係　　宝塚市付近を対象として
  • ヒョウゴケン ナンブ ジシン ニ ヨル タテモノ ヒガイ ト チケイ オヨビ タクチカ ネンダイ ノ カンケイ タカラヅカシ フキン オ タイショウ ト シテ
  • A Case Study on Takarazuka City
  • 宝塚市付近を対象として

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Relationship between damage of buildings caused by Hyogo-ken Nanbu Earthquake and landforms, and relationship between the damage of buildings and ages of residential development are investigated on Takarazuka City. Distributions of the damage of buildings, the landforms and the ages of residential development are overlaid using GIS. Ratio of the damaged residential area to whole residential area in each landform and the similar ratio in each age of residential development are calculated. Another kind of damage measure corresponding to the ratio is also estimated using regression coefficient by quantification method of the first type. The former calculation is to handle landforms and ages of residential development independently, and the latter is to handle them simultaneously.<BR>From the evaluation of the ratios and their 95% confidence interval, landforms in order of frequency of all the levels of damages are middle terrace, low terrace, artificial reformation area of lowland, alluvial fan, alluvial plain, mountain, artificial reformation area of mountain and hill, and natural levee. Landforms in order of frequency of heavy damages are the first group of alluvial fan and low terrace, the second group of artificial reformation area of lowland and middle terrace, and the third group of natural levee, mountain and artificial reformation area of mountain and hill. The order of all levels of damages and the order of heavy damages are different. Furthermore damages are more frequent in middle terrace, low terrace and alluvial fan with firmer ground than alluvial plain and natural levee of alluvial area with softer ground. Deposits of landforms and geologic structure seem important factors of these results.<BR>As for the ages of residential development, it is clear that the damages tend to less frequent in newer residential areas than older one.

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