Part 11 RECOGNITION FEATURES of TRANSLATIONAL BLOCK SLIDES.

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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

Crowley’s Ridge Translational Block Slides

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