Finite-Difference Synthetic Seismograms for SH Waves.
Abstract
The research performed under this contract, during the period 12 January 1983 through 11 January 1984, can be divided into two major topics: finite-difference synthetic seismograms for SH waves; and array analysis of the ground motions from the 1971 San Fernando Earthquake. In Section II, the accuracy and ease of application of the finite-difference method for generating synthetic seismograms of SH wave propagation in cylindrically symmetric media is discussed. The finite-difference method was the advantage that arbitrary density and velocity field in the medium may be specified. A point source is generated by a simple transformation of a line source. The accuracy of the finite-difference seismograms in flat layered media is confirmed by comparison with the Cagniard De-Hoop method. The finite-difference seismograms also agree with a previously untried dipping-layer Cagniard method. An earthquake radiation pattern is approximated by introducing a 'near-field' which has permanent displacement near the source.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 13, 1984
- Accession Number
- ADA145834
Entities
People
- Donald V. Helmberger
- J. Vidale
- R. Clayton
Organizations
- California Institute of Technology