Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, D.R. Crandell, U.S. Geological Survey. |
This house was damaged by a mudflow along the Toutle River about 40 km west-northwest of Mount Saint Helens. The May 18, 1980, eruption of the volcano triggered lahars-volcanic debris flows-which, combined with mud, caused great damage in the region. Nine highway bridges, miles of highways, and many public and private buildings were destroyed. The mudflow height is recorded by mud coatings on tree trunks. Image Credit: D.R. Crandell. U.S. Geological Survey The slopes above streams and rivers are subjected to a variety of processes that cause them to recede and retreat from the river or stream channel. These processes, collectively called mass wasting, can be classified according to rapidity of movement and according to the type of materials that are transported. |
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