1993年釧路沖地震および北海道南西沖地震の地盤震動強度の推定

概要

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The distributions of peak accelerations during the 1993 Kushiro-oki earthquake and the 1993 Hokkaido Nansei-oki earthquake are simulated by using simplified analytical procedure. Peak acceleration near the fault region is expressed as a function of the fault parameters and the relative collocation between the fault and the observation site. The acceleration at the bed rock level first was calculated, after which the Q-value of the path traveled and the amplification factor of the surface ground were introduced. To check the accuracy of the calculated peak accelerations we compared estimated values with observed values which were recorded at ports and meteorological observatories. The estimated values are in good agreement with the observed values. In the region near the fault for both earthquakes the maximum accelerations are more than 250 gal.
1995-06-01