A FORTRAN program for calculating nonlinear seismic ground response

Open-File Report 77-671



The program described here was designed for calculating the nonlinear seismic response of a system of horizontal soil layers underlain by a semi-infinite elastic medium representing bedrock. Excitation is a vertically incident shear wave in the underlying medium. The nonlinear hysteretic behavior of the soil is represented by a model consisting of simple linear springs and Coulomb friction elements arranged as shown. A boundary condition is used which takes account of finite rigidity in the elastic substratum. The computations are performed by an explicit finite-difference scheme that proceeds step by step in space and time. A brief program description is provided here with instructions for preparing the input and a source listing. A more detailed discussion of the method is presented elsewhere as is the description of a different program employing implicit integration.

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title A FORTRAN program for calculating nonlinear seismic ground response
Series title Open-File Report
Series number 77-671
DOI 10.3133/ofr77671
Year Published 1977
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Earthquake Science Center, Menlo Park Science Center
Description 16 p.; Figures; Appendices
Online Only (Y/N) Y
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