SEGJ Technical Conference

Examination of the sallow and deep structure model of the Itako and Kamisu city area and the relation of liquefaction according to microtremor observation and seismic observation

Abstract The damage of tsunami and liquefaction in the offing earthquake of the 2011 Tohoku-district Pacific Ocean was very serious. About liquefaction damage, damage is checked in the wide range of the Tohoku district and the Kanto district, and it is said about the foundation conditions which actually caused liquefaction that there are most artificial change places. Centering on the serious Hinode, Itako-city area, at intervals of about 250-500m, liquefaction damage also united enforcement and microtremor array measurement at about 400 places, and actually carried out microtremor observation with a single point in this research in Itako and Kamisu city. The foundation structural model collected boring data, after it created the geological structure model used as the foundation, from microtremor observation and a seismic observation result, searched for S wave speed structure, and created it as a speed structural model. When the earthquake motion was calculated in the created model, the result which suits a damage situation well was obtained.