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One of the major effects of the San Fernando earthquake of February 9, 1971 was a major slide in the upstream slope of the Lower San Fernando Dam. This embankment dam, about 140ft (43 m) high at its maximum section, provided a reservoir capacity of about 20,000 acre-ft (25,000,000 m3) and at the time of the earthquake the water level in the reservoir was about 35 ft (11 m) below the crest.
Seed et al. (Tue,) studied this question.