sonic sounding

sonic sounding

[′sän·ik ′sau̇nd·iŋ]
(engineering)
Determining the depth of the ocean bottom by measuring the time for an echo to return to a shipboard sound source.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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It began on February 13 and involved the 92-metre Oceanic Challenger, cruising the coast between Saltburn and Kettleness taking 3D sonic soundings. The survey was needed to establish the extent of the minerals present under the North Sea.