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   ocr: TABLE 1. SHAKING CHARACTERINSTICS OF STRONG-MOTIONRECORDS Earthquake PGA Durations Lac Displacement Recording Site, Component (g) (s) (m/s) (cm) Example Site (estimated values) 0.50 7.1 1.59-1.97 1.4-2.0 15 Oct. 1979 Imperial Valley, Calif. El Centro Differential Array, 270 0.35 7.1 1.73 1.5 15 Oct. 1979 Imperial Valley, Calif. El Centro Array #8, 1400 0.61 6.8 1.60 3.5 15 Oct. 1979 Imperial Valley, Calif. El Centro Array #11, 1400 0.36 9.0 1.99 1.1 2 Peak ground acceleration 2 J Duration as defined by Dobry and others (1978) - Arias (1970) intenssty I Calculated by Newmark 's method assuming ...