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The primary engineering goal of the Marine Seismic System (MSS) experiment on Leg 78B was to test the feasibility of installing large instruments in a borehole by means of a package carried external to the drill string. In addition to seismometers, the instrument package contained triaxial accelerometers to measure impacts associated with reentry and thermistors to measure heat generated by electronic components. Maximum vertical accelerations of about 6 g occurred when the seismometer package entered the reentry cone; maximum horizontal accelerations of 5 g were recorded when the seismometer package was hydraulically shifted into the lowering position. Lesser accelerations were noted when the instrument was handled aboard ship and when it touched down at the bottom of the borehole. Cable control adequate to prevent cable-drill string entanglement was achieved with a dynamic tension of load plus about 350 lb. These stresses are considered to be within reasonable design tolerances for most borehole instruments.

The Borehole Seismic Experiment in Hole 395A: Engineering and Installation