3:30 PM - 3:45 PM [SSS25-19] Relationship between Irregularity of Boundary of Subsurface Geology and Spatial Variation in Peak Periods of Horizontal to Vertical Spectral Ratio of Microtremors-A Study Based on Numerical Simulations- *Kentaro Motoki1, Tetsushi Watanabe1, Kenichi Kato1 (1.Kobori Research Complex)