Abstract
It is important to estimate detailed 3-D subsurface structure for strong ground motion simulation. Ground motions are controled by ground parameters such as layer thickness, P-wave velocity, S-wave velocity, and density. In the most of past studies, detailed model of density structures is not fully included in the estimation of velocity structures. In this case, the small estimation error of the density may lead the large error of the velocity structure. Thus, we propose a method to estimate subsurface structure using gravity and microtremor data simultaneously. We applied the proposed method to synthetic data of gravity and microtremor, and confirmed its appropriateness.
