The seismic properties of Lake Maracaibo were investigated in an extensive experimental program. The controlling factor was found to be extremely low mud velocities produced by free gas in the bottom mud. The most important seismic phenomenon was singing, and its characteristics were investigated in detail. Deviations from the behavior expected from a simple theory were found. A strong, low-frequency mud wave was present. Where the mud was not too thick, normal dispersion occurred.

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