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Under the scheme, landslides are sub-classified by the material that moves, and by the form of the plane or planes on which movement happens. The planes may be broadly parallel to the surface ("translational slides") or spoon-shaped ("rotational slides").
A landslide in which the sliding surface is located within the soil mantle or weathered bedrock (typically to a depth from few decimeters to some meters) is called a shallow landslide. Debris slides and debris flows are usually shallow. Shallow landslides can often happen in areas that have slopes with high permeable soils on top of low ...
The term landslide refers to a variety of mass wasting events (geologic slope failures) that include slumps, slides, falls, and flows.The two major types of slides are rotational slides and translational slides. [3]
Sudden slumps usually occur after earthquakes or heavy continuing rains, and can stabilize within a few hours. Most slumps develop over comparatively longer periods, taking months or years to reach stability. An example of a slow-moving slump is the Swift Creek Landslide, a deep-seated rotational slump located on Sumas Mountain, Washington.
Their type, severity and frequency vary. Landslides often are characterized as shallow or deep-seated — depending on whether they're rooted in the soil layer or deeper down, like the Oso slide. Landslides include debris flows often triggered by heavy rains. When logging or fire destroys trees, the loss of root structure can weaken soil.
This type of measure is used in cases of smaller landslides. The effectiveness of micropiles is linked to the insertion of micropiles over the entire landslide area. In the case of rotational landslides in soft clay, the piles contribute to increasing the resisting moment by friction on the upper part of the pile shaft found in the landslide.
Mandatory evacuations were underway in the southeastern Alaska of Ketchikan, after a landslide leveled homes and businesses on Aug. 25, 2024, leaving at least one person dead and multiple people ...
Historical maps of the ancient landslide complex, including one from the California Geological Survey, documented the slide's boundary to be well north of the Portuguese Bend Reserve, almost ...