Presentation on theme: "Part 11 RECOGNITION FEATURES of TRANSLATIONAL BLOCK SLIDES."— Presentation transcript:
Part 11 RECOGNITION FEATURES of TRANSLATIONAL BLOCK SLIDES
Topographic Expression of Translational Block Slides Extended ridges or topographic knobs Convergent drainage Sharp downslope turns in contour lines
Topographic Patterns on Composite Landslides Use drainage and topographic keys to recognize anomalous site characteristics typical of landslides –Extended ridges or isolated knobs –Sudden turns in hillside contours –Convergent drainage
Translational landslides are usually fairly large and involve underlying bedrock strata
TRANSLATIONAL BLOCK SLIDES Translational slides tend to detach along pre- existing geologic discontinuities The geologic structure generally mimics the regional trends, making many of the older slides difficult to recognize
Dormant deep-seated bedrock slides are often characterized by Y-shaped tributaries, anomalous benches, and arcuate headscarp evacuation scars
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