Dynamic elastic moduli like E, p, K and O of the foundation rock of a dam have been determined by finding Vp-and K-velocities by seismic refraction with a hammer as source. Some parameters such as "fracture frequency" and "rock quality designation" (RQD) of the foundation rock have been derived using "average regression curves" and I$-velocities. By comparing K / p with V,/V,, a few locations showing weathered conditions have been demarcated. This compares well with RQD values of those locations.
The results of geophysical surveys carried out in the Kopili Hyde1 Project site in the United North Cachar and Mikir Hills district, Assam, to locate and trace underground caverns in limestone are presented. Electrical resistivity observations over known limestone caverns showed significant anomalies (high resistivity).In the course of the systematic electrical resistivity survey conducted at the eastern fringe of the Umrong basin to study the competency of the proposed reservoir, a number of indications of possible caverns in limestone were obtained and a few of them have been verified by drilling.
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