Abstract
Recent measurements of low-frequency propagation across seamounts extending into the deep ocean sound channel are described. With the receiving hydrophone located in the farfield, sound signals were detonated at the sound channel axis by a ship crossing a seamount to determine the relative signal enhancement and shadow regions. Newly discovered peaks in the Louisville Ridge located to the east of New Zealand were used for two separate experiments. In the first experiment the seamount extended above the depth of the sound channel axis; in the second, a seamount was chosen that was slightly below the axis. The results are compared with mode cutoff and simple scattering theory and also with previous propagation experiments conducted across the Louisville Ridge.
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