171A Scientific Prospectus

Position: 15°32.40'N, 58°43.395'W

Water Depth: 4970 m

Sediment Thickness: 776 m

Total Penetration: 800 mbsf

Seismic Coverage: 3D-grid Line 751-SP 1154
East-west seismic profile through Site NBR-5A; VE: 3.7.

Objectives: The objectives of Site NBR-5A are

1. To determine physical properties through a negative polarity reflection at the décollement zone.

2. To provide a reference profile of physical properties through the accretionary prism, décollement zone, and underthrust sedimentary section.

Drilling Program: No cores.

Logging and Downhole: LWD.

Nature of Rock Anticipated: Pelagic and hemipelagic sediments, local distal turbidites in underthrust section.

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