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Landslides This shows the Turnagain Heights landslide in Anchorage. Seventy-five homes twisted, slumped, or collapsed when liquefaction of subsoils caused parts of the
suburban bluff to move as much as 2,000 feet (606 m) downward toward the
bay, forming a complex system of ridges and depressions. The slide
developed because of a loss in strength of the soils, particularly of
lenses of sand, that underlay the slide. The motion involved the
subsidence of large blocks of soil, the lateral displacement of clay in
a 25 feet (7.6 m) thick zone, and the simultaneous lateral translation
of the slide debris on liquefied sands and silts. Photo Credit:
NOAA/NGDC |