SEGJ Technical Conference

Examination of the structure model according to microtremor observation and seismic observation of the Hinode area in Itako city, and the relation of liquefaction damage

Abstract Significant liquefaction affected the Tonegawa basin as well as the Tokyo-bay area during the 2011 Tohoku-oki earthquake. This liquefaction caused undermining many house foundations and destroying infrastructure around these areas. In this study, Microtremor observation carried out in Itako-city(HInode) area. The number of microtremor array measurement is 20 points. On the other hand, the number of the microtremor observations with a single point is 400 points. In this study, the foundation structural model is created. First, the foundation structure model was created after collecting boring data. Next, the velocity structure model was always corrected by microtremor observations. Finally it compared with seismic observation record.