Fate of Dredge Disposal Material and Polluted Sediment, Offshore Honolulu, Hawaii

3D Color Perspective View Of The South Oahu Margin, Western Mamala Bay

View direction is to the north. The top edge of the image is the shallow limit of mapping (about 60m); depths in the foreground exceed 600m. Points (A) and (B) delineate submerged reef terraces. Point (A), referred to as the Ewa Wall, is the location of a Pisces V submersible dive in August 1998 to examine the physical settings of habitats of commercially important bottom-dwelling fish. Location (C) is a zone of high back-scatter (red color) at high relief, indicating exposed reef limestone outcrops. Locations marked as (D) show typical examples of outcrops surrounded by a moat. Large-scale bedforms (E), probably sandwaves, are common along the South Oahu margin. The scale across the bottom of the image is appx. 4.5 km. The vertical exaggeration is 5x.

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For more information, please contact:
Michael E. Torresan

U.S. Geological Survey
345 Middlefield Road MS 999
Menlo Park, CA 94025