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OBSs are well-tested, functional tools commonly used in crustal seismology. The cost per deployed receiver is higher than that of OBCs and there are still issues to be solved regarding the accuracy of landings on the sea bottom, but they can be deployed much deeper and are more robust than OBCs. They have potential for improvement, and can be the tool of choice for 4-C surveys at depths greater than 1500m.

Stanford Exploration Project