NEHRP Clearinghouse

Title
A Deterministic Approach to the Prediction of Free Field Ground Motion and Response Spectra from Stick-Slip Earthquakes.
File
PB293019.pdf
Author(s)
Cherry, J. T.; Halda, E. J.; Hamilton, K. G.
Source
National Science Foundation, Washington, DC. Applied Science and Research Applications., December 1974, 47 p.
Abstract
Theoretical and experimental results from computational physics and nonlinear rock mechanics have been merged in order to obtain a deterministic model of a stick-slip earthquake. The model has been exercised to uncover the dependence of peak ground motion and response spectra on fault length, rupture velocity and dynamic stress drop during rupture. A particular method for generating a design spectrum has been tested against results from the model. Use of this deterministic technique seems especially appropriate when design information is required at sites located near the epicenter. This earthquake model furnishes the near source ground motion caused by the stick-slip rupture process. The only limitation in the model is the plane strain assumption which implies an infinite fault dimension normal to the plane. Theoretical seismograms from this model would be appropriate for an earthquake having an out-of-plane fault dimension comparable to the distance between the fault and the building site.
Keywords
Ground motion; Rock mechanics; Earthquake engineering; Seismic epicenter; Stress analysis; Earthquakes; Stress waves; Earth movements; Mathematical models; Geological faults; Dynamic structural analysis