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Development and Application of a Source for Crosshole Seismic Method to Determine Body Wave Velocity with Depth at Multi-layered Sites  

Sun, Chang-Guk (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources)
Mok, Young-Jin (School of Architecture and Civil Engineering, Kyung Hee University)
Publication Information
Geophysics and Geophysical Exploration / v.9, no.3, 2006 , pp. 193-206 More about this Journal
Abstract
Among various borehole seismic testing techniques for determining body wave velocity, crosshole seismic method has been known as one of the most suitable technique for evaluating reliably geotechnical dynamic properties. In this study, to perform successfully the crosshole seismic test for rock as well as soil layers regardless of the groundwater level, multi-purposed spring-loaded source which impact horizontally a subsurface ground in vertical borehole was developed and applied at major facility sites in Korea. The geotechnical dynamic properties were evaluated by determining efficiently the body wave velocities such as shear wave velocity and compressional wave velocity from the horizontally impacted crosshole seismic tests at study sites, and were provided as the fundamental parameters for the seismic performance evaluation and seismic design of the target facilities.
Keywords
crosshole seismic test; shear wave velocity; compressional wave velocity; borehole seismic method;
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