Abstract
Previous experiments in the South Pacific have shown that bottom features have a significant effect on sound channel propagation when observed at a bottom-mounted hydrophone A comparison is made of a similar bottom-mounted system with a hydrophone suspended at the sound channel axis in mid water using data obtained during the KIWI ONE Experiment along a 6000-NM track from New Zealand to South America. The effect of the East Pacific Rise and the Louisville Ridge on the observed propagation loss from shots detonated at the sound channel axis is discussed.
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