Seafloor Environments North St. Croix Margin and Virgin Islands Trough. Part 1. Introduction. Part 2. Geology and Geophysics. Part 3. Geotechnical Investigations. Part 4. Engineering Significance
The Virgin Islands Trough (VIT) is a deep (4500 meters (m)), elongate basin bounded on its north and south sides by steep fault escarpments. The south escarpment forms the north submarine slope of St. Croix Island and has an average gradient of 18-23 degrees, although local gradients vary between 5-47 degrees. The slope is cut by two submarine canyons that terminate at mid-slope. In the case of the larger canyon, erosional debris is carried from the canyon mouth to the basin floor via a system of gullies. This report is organized into four parts: Introduction, Geology and Geophysics, Geotechnical Investigations, and Engineering Significance.
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