The "Vibroseis" system of exploration received extensive use during its early development in the Los Angeles basin. Later CDP efforts were hampered by increased urbanization. "Vibroseis" CDP examples demonstrate some of the results of an exploration program over a large part of the San Joaquin Valley. One partial solution is demonstrated for weathering control for surface source data. Examples of higher effort "Vibroseis" data in more complicated areas conclude the 15-year evolution.

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