Abstract
The Santa Barbara channel is the offshore extension of the Ventura basin. Gravity measurements were made in the channel with a LaCoste-Romberg surface-ship gravity meter on four cruises. Although a great deal of effort was spent adjusting positional data, correctional uncertainties linked with navigation often exceeded those of the acceptable gravity measurements. The measured mean square discrepancy of the accepted gravity measurements, evaluated at 147 crossings of the ships tracks, is 2.7 mgal. A westward extension and gradual shoaling of the Ventura basin is implied by an elongate gravity minimum which is flanked by a gravity maximum coinciding with the Channel Islands. Diverging from this east-west structural grain is a pronounced northwest-trending gravity ridge.
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