学会誌「自然災害科学」

Extraction of Ground Characteristics Based on Questionnaire Seismic Intensity and the Applicability to Seismic Microzonation

宮崎 雅徳*・秋吉 卓**・尻無濱 昭三***

Masanori MIYAZAKI*, Takashi AKIYOSHI** and Shozo SHIRINASHIHAMA***

Abstract

This paper proposes a simple method to estimate quantitatively ground characteristics of surface layers based on the seismic intensity map by questionnaire survey after an earthquake's occurrence and also discusses its applicability to seismic microzonation. The questionnaire surveys have been performed for three moderate earthquakes which occured around Kumamoto City. This paper shows that the subtraction of seismic intensity by the empirical attenuation formula from local seismic intensities by questionnaire surveys reflect the differences of local ground characteristics of surface soft layers. Finally, the seismic microzoning map in Kumamoto City was shown as an application of the proposed method.

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