Simulation of strong ground motions
The estimation of potential strong ground motions at short epicentral distances (Δ = 10 to 25 km) resulting from large earthquakes, M ≧ 6.5, generally requires extrapolation of a limited data set. The goal of this project has been to quantify the extrapolation through a simulation technique that relies heavily upon the more extensive data set from smaller magnitude earthquakes. The simulation utilizes the smaller events as Green's functions for the elements of a larger fault. Comparison of the simulated peak acceleration and duration with the data from the Parkfield earthquake is very good. Simulation of three earthquakes, M = 5.5, 6.5, and 7.0 indicate that the slope of the peak acceleration versus distance curve (Δ = 5 to 25 km) flattens, for strike-slip earthquakes, as the magnitude increases.
Additional Information© 1979, by the Seismological Society of America. Manuscript received August 21, 1979. This project benefited from frequent discussions with Robert S. Hart and Woody Savage. Steve Hartzell kindly provided the digitized Horse Canyon accelerograms. The authors thank Bill Joyner and Dave Boore for critically reviewing the manuscript. The research was supported under contract with Woodward-Clyde Consultants for Southern California Edison. Sierra Geophysics Report SGI-R-007.
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