SEGJ Technical Conference

REESTIMATION OF VELOCITY STRUCTURE OF YAMAGATA AND AKITA AREA BASED ON MICROTREMOR OBSERVATION

Abstract We considered the period and amplifying characteristic for advance of the subsurface structure from the seismic bedrock to the ground surface (Senna et al.,2013). In this research, a microtremor observation was performed in low land and the plateau part in Akita and Yamagata area. We conducted a lot of microtremor observations in this area in the past. Because there is very little borehole data in this area. Microtremor data used a 'Microtremor database' of NIED. Microtremor data interpreted data by CCA method analysis as well as an array analysis by SPAC method. Underground structure model was reorganized using those data.