Relationship between damage of levee and its resonant frequency in Shinano River subjected to Niigata Chuetsu Earthquake in 2004

Abstract

At the Niigata Chuetsu Earthquake in 2004, the levees along the Shinano River and the Uono River were widely damaged. The damage of levees depends not only on the distance from the epicenter but also on the foundation stratum of levee. In this study, we classified the degree of the damage of the levee situated 2 to 50km from the epicenter, and compared these damages with the geological categorization of the levee foundation. To make clear the seismic characteristics of each geological category, we carried out the linear elastic analysis based on multiple reflection theory using results of standard penetration and laboratory soil tests. We compared damage type with the dominant frequency by multiple reflection theory and averaged layers.