Abstract
Currently, any account of quick-clay in the United States becomes primarily an account of the landslides caused at the time of the Anchorage, Alaska earthquake of March 27, 1964. Quick-clay triggered by the Anchorage earthquake flowed beneath a comparatively flat lying surface veneer of gravel, sand, and silt and rafted along overlying coarser sediments and many houses. Slides of several types exist at Anchorage: ( 1) new slides and new slumps formed at the time of the earthquake, ( 2) old slides formed long before the 1964 shock, ( 3) areas of monolithic movement where quick-clay passed beneath fairly stable old slide areas. The Anchorage quick-clay is apparently of glacial origin, formed at the coast line, but subsequently elevated and leached of salt. The significant clay minerals are illite and chlorite. The constituent smaller than 2 μ is on the stable old slide areas. presumably was high. Thixotropic behavior is apparently a characteristic of much of the fine clay.
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