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Rock Slides and Landslides from Alaska Earthquake
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Fragmented ice on Skilak Lake on the Kenai Lowland. The intense local fragmentation here may have been produced by an underwater landslide.
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At many places along the mountain front bordering Turnagain Arm, earthquake-triggered avalanches buried the Seward Highway and the main line of The Alaska Railroad. The railroad is on top of the embankment at the foot of the mountain. The highway is at the foot of the embankment, at the edge of the mud flats.
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The earthquake precipitated some large rock slides in the Chugach Mountains. The debris from this one, which fell on Sherman Glacier, covered about 2 square miles. It originated on the highest mountain in right background.
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A series of earthquake-triggered landslides in glacial deposits disrupted almost a mile of The Alaska Railroad main line at Potter Hill near Anchorage.
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The Turnagain Heights landslide in Anchorage occurred along a steep bluff fronting Knik Arm on Cook Inlet. Its length, which is parallel to the bluff, was about 1.5 miles; its width was about 1/4 to 1/2 mile. Many of the finer homes of the city were reduced to rubble by this landslide. Failure here and in the L Street, Fourth Avenue, and Government Hill landslides in Anchorage occurred on horizontal or near horizontal slip surfaces in the Bootlegger Cove Clay, a marine silt of Pleistocene age.
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Credits: All earthquake photographs courtesy of the U.S. Geological Survey. YupRocks makes no copyright claims on these photographs; they are public domain and may be freely distributed. |
