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The 2010 Mount Meager landslide was a large catastrophic debris avalanche that occurred in southwestern British Columbia, Canada, on August 6 at 3:27 a.m. PDT (UTC-7).More than 45,000,000 m 3 (1.6 × 10 9 cu ft) of debris slid down Mount Meager, temporarily blocking Meager Creek and destroying local bridges, roads and equipment.
Detailed map of Mount Rainier's summit and northeast slope showing upper perimeter of Osceola collapse amphitheater (hachured line) The Osceola Mudflow, also known as the Osceola Lahar, was a debris flow and lahar in the U.S. state of Washington that descended from the summit and northeast slope of Mount Rainier, a volcano in the Cascade Range during a period of eruptions about 5,600 years ago.
Debris flows with volumes ranging up to about 100,000 cubic meters occur frequently in mountainous regions worldwide. The largest prehistoric flows have had volumes exceeding 1 billion cubic meters (i.e., 1 cubic kilometer). As a result of their high sediment concentrations and mobility, debris flows can be very destructive.
Most LS is generated on highlands by erosional processes related to mass-wasting, sheet flow, rills and gullies. The deposited colluvium has a low travel distance and accumulates in midslope drapes near the site of erosion, in aprons or sediment wedges at the base of the slope or in fans at the mouth of gullies, debris flows and tributaries. [1]
These "purple zones" show areas where landslides, known in geology as "debris flows," are likely to start. The zones make up 13.3% of the mountainous counties in western North Carolina, which adds ...
The point where a muddy material begins to flow depends on its grain size, the water content, and the slope of the topography. Fine grained material like mud or sand can be mobilized by shallower flows than a coarse sediment or a debris flow. Higher water content (higher precipitation/overland flow) also increases the potential to initiate a ...
The California Geological Survey, a state Conservation Department division, studies the potential for post-fire debris flows and creates maps and reports that the state Office of Emergency ...
Prehistoric sector collapses are stored in the geological record [1] in the form of debris avalanche deposits [2] and collapse scars. Debris avalanche deposits can be found up to 20 km from the site of collapse. [3] Studying avalanche deposits informs on the time scale of the collapse and the volcano from which it originated. [2]