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Presented here are the navigation, bathymetry, and underway geophysics for the USNS Lynch Cruise 070581 in support of Leg 78B. The primary objectives of this cruise were to deploy, around DSDP Hole 395A, four University of Texas ocean-bottom seismometers (OBS's) designed to record explosives detonations around the site for seismic refraction experiments (Jacobson et al., this volume); to measure near-surface current speed and directions (Boyd, this volume) in order to position the Glomar Challenger for deploying the borehole seismometer; and to measure bottom currents for coherence studies of acoustic noise (Adair et al., this volume). Other objectives were to obtain bathymetry, seismic reflection profiles, and magnetic profiles during transit runs, and to collect XBT (expendable bathythermograph) and SVSTD (sound velocity, salinity, temperature, density) casts at the site. This chapter describes the results from these studies and the operational schedule aboard the Lynch.

Underway Geophysical Measurements on the USNS Lynch in Support of Leg 78B