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Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources, 30 Gajeongdong,Yuseong, Daejeon 305-350, KoreaReceived 1 August 2014; received in revised form 22 August 2014; accepted 26 August 2014        (rift, grain, hardway)  .             , , , ,     . ,            . ,          . :  ,  ,  , Granite rock is reported to have three orthogonal anistoropic planes i.e., rift, grain induced by microcrack char-acteristics and mineral arrangement. We investigated the influence of thus fabric anisotropy in granite on elasticwave properties using free-free resonance test to obtain unconstrained compression wave velocity, shear velocity,Poisson ratio and damping ratio. As a result, Rod wave velocity is more dependent on anisotropy of granite due tomicrocrack distribution than shear wave velocity. In addition, anisotropy of Poisson ratio and damping ratio is alsoobserved with respect to three anisotropic planes. Key words : Pocheon granite, anisotropy, microcrack, free-free resonance tests

Influence of Anisotropy of Microcrack Distribution in Pocheon Granite Rock on Elastic Resonance Characteristics