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Amplification characteristics in surface layer are often estimated by simple 1D structure for design input motions. In case of inclined engineering bedrock, it’s important to grasp effects on amplification characteristics. This paper presents the result of 2D-FEM analysis with one-side and two-side 10 degrees incline. Predominant period of 2D structure is 10 or 20 % shorter than that of 1D structure. The one-side incline slightly increases amplitude of 1D structure in the area where incident and diffracted waves interfere. Amplitude in the center of the two-side incline is larger than that of 1D structure due to a concentration of waves.

A FUNDAMENTAL STUDY ON EFFECTS OF INCLINED ENGINEERING BEDROCK ON AMPLIFICATION CHARACTERISTICS IN SURFACE LAYER