Practical application of damping properties of subsurface ground towards high-precision aseismic design

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A method for the identification of the damping parameter(Quality factor) in subsurface ground using array records of ground motions is developed. The ground motions have been recorded at observation stations of KiK-net which is employed by NIED(National Research Institute for Earth Science and Disaster Prevention). The records of ground motions, which are corrected for the azimuth error of bottom sensors as well as surface sensors, are used in the identification. The identification is carried for the observation stations which are regarded to be appropriate by field investigation. Accumulating the results of identification, the trends of the frequency dependency of quality factor are extracted and quality factor of frequency non-dependent type is modeled.