2022 年 22 巻 3 号 p. 3_58-3_74
This study summarizes the predominant periods of the H/V spectral ratio of microtremors and sedimentary layer thicknesses above the engineering bedrock using topographic locations with varied landform evolution as objectives. The derived regression equation was unique to each location, indicating the evolution of the landform. Using the regression equation and earthquake observation data, we estimated the values of the ground's predominant period, which were consistent with the actual measured values. This result confirmed the significance of topographic classification. When creating ground hazard maps, the hazard-prone area should be classified into topographic areas based on the landform evolution as the basic information for the zoning. Then, these topographic areas should be further classified based on the H/V spectral ratio of microtremors and sedimentary layer's thickness.
