Post-Cyclic Loading Behavior

Submerged sloping (10° to 25°) stratified deltaic deposits of sandy pebbles and loose sand 

Saturated lacustrine deposits of sand and sandy gravel 

Lake surroimded by steeply sloping rock walls with river deltas occurring at four locations Lakeview, Lawing, Ship Creek, and Rocky Creek. Submerged slopes varied between 10° and 20° and sloping heights of 22(W20ft 

Large underwater slides occurred where the HoHsh and deltas project into Kenal Lake. The slides were Hendron reported to have moved from 600 to 4100 ft (1975) carying from 4 to 200 thousand yd of material The four largest slides (Lakeview, Lawing, Ship McCulloch Creek, and Rocky Creek) were described. (1966) 

Details include damage area, volume, lateral movement, and depth of sliding pre- and postearthquake slopes. In general the unconsolidated sediments in deltas experienced lateral spreading. Piles (driven to 30 ft) in one case were observed to move laterally without any tilting 

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