Oceanic current is closely related to such sea water structure as temperature distribution. To observe the change of current in mid-deep water, a method of estimating the vertical sound speed profile using multipath propagation is studied. In mid-deep water, sound is propagated by repeated reflection at both bottom and surface. We estimate the reflection loss of the sea bottom in Sagami Bay from the sound transmission experiment data. Then, using a mid-deep water model, we estimate the vertical sound speed profile from travel times of bottom and/or surface reflected rays. Good results show that estimation of the vertical sound speed profile is valid for mid-deep water monitoring.
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