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The San Francisco Bay Tunnel Site Evaluation System

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1 Author(s)
Forbes, C.B. ; United ElectroDynamics, Inc., Pasadena, Calif.

Geophysical exploration techniques and instruments have been coupled with more conventional recording equipment to obtain design data for an underwater tunnel. The system was designed specifically to measure the phenomenon of displacement multiplication between the underlying competent rock and the overlying sand-clay and mud layers. The resulting recordings clearly show this effect.

Published in:

Proceedings of the IRE  (Volume:50 ,  Issue: 11 )