Accession Number:

ADA409508

Title:

Soil Attenuation in Seismic Simulations: Implications for Vehicle Tracking

Descriptive Note:

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB

Report Date:

2001-09-01

Pagination or Media Count:

21.0

Abstract:

This paper describes an implementation of broadband soil attenuation in finite-difference time domain FDTD simulations of seismic wave propagation from impulsive sources. We concentrate on the attenuation phenomenon, the computational approach, comparisons with results from non-attenuating soil models, and the impacts on range estimation. Results are based on our three dimensional viscoelastic FDTD code ptop, which allows impulsive and moving vehicle simulations over realistic heterogeneous geologies and surface topographies. Soil attenuation refers to the decay of seismic energy by intrinsic material losses in soil. It can reduce the amplitude of propagating waves and shift the frequency of signal energy, thus affecting vehicle range estimates and seismic signatures. Relative to other attenuation factors, i.e., geometric spreading and scattering, soil attenuation often dominates the total attenuation characteristics of seismic surface waves generated by moving vehicles.

Subject Categories:

  • Seismology
  • Surface Transportation and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE