地震動の平均応答スペクトルを評価する経験式の物理的基礎

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書誌事項

タイトル別名
  • THEORETICAL BASIS OF EMPIRICAL RELATIONS ABOUT RESPONSE SPECTRA OF STRONG GROUND-MOTIONS
  • ジシンドウ ノ ヘイキン オウトウ スペクトル オ ヒョウカスル ケイケンシキ

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抄録

A response spectrum S(T) of a seismic wave record is empirically expressed as a function of earthquake magnitude M and hypocentral distance X to calculate an averaged S(T) from observed strong ground-motion records. The following formula is commonly used to calculate the averaged S(T): log S(T)=a(T)M-b(T)logX+c(T) where a(T), b(T), and c(T) are regression coefficients at a period of T sec. Their physical meanings are investigated on the basis of the theory of earthquake fault-model. a(T), b(T), and c(T) can be expressed as simple functions of some physical parameters, in the case that the term in relation to X is written as (b(T)X+logX), instead of b(T)logX. The values of these functions, which are calculated theoretically, are consistent with those of repression coefficients obtained from the observed data in the period range from 0.1 to 1.0 sec.

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