善光寺地震(1847)におけるお寺の被害 : アンケート調査とJoyner and Boore式による震源断層の想定

概要

論文の詳細を見る
A survey questionnaire was taken analyzing the distribution of structural damage on 624 temples in the northern region of Nagano Prefecture affected by the Zenkoji earthquake which occurred in 1847 (M=7.4). A total of 278 temples responded to the survey and of these, only 155 provided valid evidence. From this evidence it was found that 57 temples were completely destroyed, 17 partially damaged and 70 others suffered miner damage as result of the Zenkoji earthquake. Previous investigation have revealed the existing faults in this northern region, and this study shows that the extent of damage mentioned above was distributed along the active fault system on the western side of the Nagano Basin. This study hypothesizes the possibility of the existence of an earthquake source fault, either a linear fault or a folded fault. It runs 40 km in length and could produce earthquakes which might register on the magnitude of 7.4 respectively. Using the attenuation model proposed by Joyner and Boore (1981), the distributions of structural damage of these temples was compared with the intensity of acceleration calculated by this model. It can be then seen that the damage of these temples was reduced depending on the distance away this hypothesized fault according to the attenuation effect.
長野工業高等専門学校の論文
1997-12-26