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Six ocean bottom seismographs from the Scripps Institution of Oceanography were used in the Ngendei experiment in conjunction with the Marine Seismic System. The systems were modified to meet the requirements of this experiment. Significant buffer memory was added to several of the instruments to eliminate the effects of a rotating tape recorder housed in the same capsule as the inertial sensors. In addition, the response of the instruments was modified for the triggered portion of the experiment to improve the likelihood of detecting low frequency teleseismic signals. Finally, the software used by the seismographs central processing unit was modified to allow simple, but important, changes in the operating characteristics immediately before launch. Each instrument was deployed several times and all capsules were recovered. Several deployments were found to be unsuccessful through acoustic diagnostics and several capsules returned to the surface shortly after launch because of small leakages revealed by the leak detectors. Nevertheless, all deployments following the correction of these faults were successful in returning data. This chapter outlines the operating characteristics of each instrument, describes the instrument response functions, lists the locations of the seismographs on the seafloor, and enumerates the events recorded by each of the capsules.

Description and Performance of the Scripps Ocean Bottom Seismographs during the NGENDEI Experiment