What's Causing these Landslides in Southern California? Palos Verdes Area.
Автор: TheEarthMaster
Загружено: 2024-09-27
Просмотров: 10794
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Audio left out towards end of video. Continued movement of the Portuguese Bend landslide since 1956 has been due to four main
factors. A rise in the water table during the period 1957-1968 has been documented in the northwestern part of the moving mass and is attributable mainly to infiltration of surface runoff entering numerous open fissures that cut the surface of the slide. The toe of the active slide daylights along the shoreline and is subjected to storm-wave erosion, so that any natural build-up of resisting forces is prevented in this area. The redistribution of mass as the slide has moved along an undulatory failure surface has been responsible for local fluctuations in the driving and resisting forces.
Finally, smoothing of irregularities in the failure surface by the moving slide mass must have decreased some of the forces resisting movement. I feel this will slowly continue and expand over time.
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