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Overview of the Turkey Flat Ground Motion Prediction Experiment

by Charles R. Real, Anthony F. Shakal and Brian E. Tucker

Real, Charles R., Anthony F. Shakal and Brian E. Tucker (2006). Overview of the Turkey Flat Ground Motion Prediction Experiment. SMIP06 Seminar on Utilization of Strong-Motion Data, p. 117 - 136.

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Abstract

Recognizing the wide variability of methods and often conflicting results of seismic response analyses used for design and construction in the early 1980’s, the California Geological Survey (CGS) established the Turkey Flat Site Effects Test Area in 1987, and within two years a blind test was conducted to predict the test area’s low-strain seismic response. Test results focused on the need to reduce uncertainties in the geotechnical parameters that drive site response codes. Fifteen years later, the array recorded the September 28, 2004 M6.0 Parkfield Earthquake at a fault-rupture distance of only 5 km. A blind test has been conducted to evaluate the ability of current practice to determine the test area’s moderate-strain seismic response. This paper provides an overview of the Turkey Flat test site, and describes the rationale for what has become an evolving blind test experiment.