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The objective of this study is to estimate shear wave velocity of rockfill materials by making practical use of the micro-earthquake records which are ordinarily obtained at a domestic rockfill dam and to verify its applicability. Micro-earthquake records were obtained at the site of Heongseong dam and Soyanggang dam, which are the existing multi-purpose dams in Korea. In the previous study, th e fundamental periods of each dam were already evaluated by analyzing the response spectrum of the observed records. In this study, numerical analyses varying shear moduli of rockfill zone were carried out using the acceleration histories measured at the abutment as input ground motions. From comparison between the fundamental periods calculated by numerical analyses and measured records, the shear wave velocities with depth were estimated. It is found that the effect of different earthquake events on shear wave velocity estimation for the target dam materials is negligible and the shear wave velocity can be consistently evaluated. Furthermore, c omparing the shear wave velocity with the previous researchers’ empirical relationships and field test results, applicability of suggest ed method is verified. Therefore, in case that it is impossible to conduct field tests and estimation is preliminary, the suggested method can be practically used.Key words : Micro-earthquake, Rockfill dam, Dynamic numerical analysis, Fundamental period, Shear wave velocity                   .                              ,    .              ,          .  ,                ,           . : , , , ,  Geotechnical Engineering

Estimation of Shear Wave Velocity of Rockfill Zone by Dynamic Analysis using Micro-earthquake Records