Landslide Hazard Information
The information presented here provides an introductory primer on understanding basic scientific facts about landslides-the different types of landslides, how they are initiated, and some basic information about how they can begin to be managed as a hazard.
Fall:Falls are abrupt Movements of Masses of geologic materials, such as with the with the rocks and with the Boulders, That Become detached from by by Steep Slopes or cliffs. Separation occurs along discontinuities such as fractures, joints, and bedding planes, and movement occurs by free-fall, bouncing, and rolling. Falls are strongly influenced by gravity, mechanical weathering, and the presence of interstitial water.
Types of Landslides
The term «landslide» describes a wide variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or a combination of these. The materials may move by falling, toppling, sliding, spreading, or flowing. The drawing below is a graphic illustration of a landslide, with the commonly accepted terminology describing its features.Although landslides are primarily associated with mountainous regions, they can also occur in areas of generally low relief. In low-relief areas, landslides occur as cut-and-fill failures (roadway and building excavations), river bluff failures, lateral spreading landslides, collapse of mine-waste piles (especially coal), and a wide variety of slope failures associated with quarries and open-pit mines. The most common types of landslides are described and illustrated on this page.
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