by John Hall and Steven Alves
Hall, John, and Steven Alves (2003). Nonuniform Ground Motion Effects at Pacoima Dam. SMIP03
Seminar on Utilization of Strong-Motion Data, p. 67 - 86.
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A magnitude 4.3 earthquake was recorded on an array of accelerometers at Pacoima Dam on January 13, 2001. The records are used for two purposes:
(1) to analyze the effects that canyon topography has on the ground motion along the abutments, and (2) as input for a system identification
study, leading to a calibrated finite element model of Pacoima Dam. The quantified amplification and time delay characteristics of the 2001
abutment motions serve as a basis for generating records to replace ones that went off-scale during the 1994 Northridge earthquake. These
generated records were then used in the finite element model to verify that nonuniform ground motion caused by the topography has a significant
impact on the dam response. Forced vibration tests were also conducted in July/August 2002.