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Topographic Features of Translational Block Slides

Learn how to recognize and identify translational block slides through topographic patterns such as extended ridges, convergent drainage, and sharp downslope turns in contour lines. Discover the unique characteristics typical of landslides, including sudden turns in hillside contours and isolated knobs. Explore the geologic structure and challenges associated with identifying older slides.

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Topographic Features of Translational Block Slides

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  1. Part 11 RECOGNITIONFEATURES ofTRANSLATIONAL BLOCK SLIDES

  2. Topographic Expression of Translational Block Slides • Extended ridges or topographic knobs • Convergent drainage • Sharp downslope turns in contour lines

  3. 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

  4. Crowley’s Ridge Translational Block Slides

  5. Translational landslides are usually fairly large and involve underlying bedrock strata

  6. 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

  7. Dormant deep-seated bedrock slides are often characterized by Y-shaped tributaries, anomalous benches, and arcuate headscarp evacuation scars

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