常時微動より推定した福井平野の表層地盤震動特性 : 1948年福井地震の被害との対応

概要

論文の詳細を見る
Authors observed microtremors in Fukui Plain to study relationships between characteristics of microtremors and the damage of wooden houses caused by the 1948 Fukui Earthquake. By the distribution maps of predominant periods using H/V spectral ratio and damaged ratios of wooden houses, the distribution of the short periods corresponded to the low damaged ratios. And the long periods distributed on alluvial deposit in the western part from the earthquake fault. The high damaged ratios at the sites of alluvial deposit are located within 8km from the earthquake fault, but these decreased farther than 8km. The predominant periods are related with the thickness of alluvial deposit. We conclude that the earthquake damages are related with the dynamic characteristics of surface geology in this area.