EXAMINATION ON VIBRATION CHARACTERISTICS OF SCHOOL BUILDINGS OF KAWAGUCHI-MACHI AND HORINOUCHI-MACHI IN NIIGATA PREFECTURE AND SOIL VELOCITY STRUCTURES OF THE SITES THROUGH MICROTREMOR OBSERVATION

Abstract

We investigated vibration characteristics of school buildings of Kawaguchi-machi and Horinouchimachi about one month after the Niigata-ken Chuetsu earthquake using microtremor observation methds. The natural frequencies on soil structure interaction system and on base fixed system of the buildings were obtaind. The subsurface structures of the sites were surveyed using the SPAC method through microtremor L-shape array obserbation. It is thought that these investigation results become useful reference data for the earthquake damage analysis in the buildings and the presumption of the input earthquake level.