Accession Number:

AD0767010

Title:

3-D Seismic Code for ILLIAC-IV

Descriptive Note:

Interim rept.

Corporate Author:

SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA

Report Date:

1973-02-09

Pagination or Media Count:

114.0

Abstract:

Finite element FE and finite difference FD spatial differencing schemes for linearly elastic materials are compared on a common basis. Conditions are established under which the two methods are identical. Features commonly associated with FD methods are combined with a FE spatial treatment to obtain an explicit time stepping algorithm suitable for processing 3-D linearly elastic wave calculations on the ILLIAC IV system. Test calculations are presented to compare FE and FD codes at S3. Comparisons are made for two problems A spherically symmetric explosion with an exponentially decaying step pressure and Lambs problem - an impulse loading applied to the free surface of a homogeneous half space. Test calculations are presented for exploring certain features of the 3-D time stepping algorithm.

Subject Categories:

  • Seismology
  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE