Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, R.L. Schuster, U.S. Geological Survey. |
During the winter storms of February 1996, landslides and debris flows occurred in the northwestern United States. Areas of highest rainfall intensities were centered along the Oregon-Washington border. Estimates of damage from the floods and landslides exceeded $800 million in Washington and Oregon alone. This photo shows a landslide in marine sediments over basalt, extending across Washington State Highway 4 into the Columbia River west of Stella. Image Credit: R.L. Schuster. 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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