Estimation of ground earthquake motions on the 2007 Noto Peninsula Earthquake and relationship between wooden structural damages and earthquake motions

摘要

建物の地震被害に大きな影響を与える要素として，地震動特性については，近年飛躍的に発展を遂げた国内各種の強震観測網により，多くの情報が得られるようになった．しかし，能登半島地震のように地方では震度情報しか得られない事例も見られ，被害を推定するためにはより正確な地震動の推定が求められる．そこで本研究では，このように情報の少ない地区で地震動を推定するために，周辺の地震記録と常時微動観測を用いた地震動波形の推定を行うことで，建物被害との関係について検討を行う．その結果，推定した地震動と建物被害との関係を地震動の強さだけでなく地震動と建物の共振による被害について考察した． The characteristic of an earthquake motion which affects wooden structural damages can acquire much information by a network of seismic stations. However, only seismic intensity information may be acquired in many local resions. In order to evaluate earthquake damages, a more accumrate earthquake motion needs to be estimated. In this research, an earthquake motion is estimated by using the earthquake record and microtremors observation of the ground to presure an earthquake motion in the area of such limited information, and considers the relation with wooden structure damage. As a result, not only the relation between the strength of an earthquake motion and damage but the relation between an earthquake motion and the damage by resonance of a structure was clarified by using the estimated earthquake motion.