Study of 3D Subsurface Structure Modeling Method Using Boring Data and Microtremors Observations

Abstract

When considering earthquake disaster prevention, it is important to understand the subsurface structure of the area with a high degree of accuracy. In general, accurate subsurface structure estimation requires high-density borehole data. However, the low density of borehole data in regional cities makes it difficult to create a highly accurate subsurface structure model. Recently, technological progress has been made in estimating the subsurface structure using microtremors observations. Therefore, here we attempted to estimate the three-dimensional subsurface structure with high accuracy by combining borehole data and microtremors data. The validity of the estimated subsurface structure was confirmed in terms of topography and amplification characteristics.