Effects of Propagation Paths on Surface-Wave Magnitude Estimates

Abstract

The report investigates the effect of realistic propagation paths on the visual and spectral amplitudes of fundamental mode Rayleigh waves. It shows that the Harkrider amplitude response factor of a layered media should relate directly to a station correction; it varies by a factor of nearly three between oceanic and continental sites. Attenuation due to effective Q losses may cause scatter, of over one-half magnitude unit, in teleseismic amplitudes but is unimportant at regional distances. Differences in recorded amplitude caused by dispersion over oceanic and continental paths are sufficient to warrant the application of path corrections to visually measured amplitudes. These differences can be avoided by computing spectra of the signals, or suppressed somewhat by using the results of stationary-phase approximations.

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Document Details

Document Type
Technical Report
Publication Date
Sep 14, 1971
Accession Number
AD0739180

Entities

People

  • David H. Von Seggern

Organizations

  • Teledyne Technologies

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Continents
  • Deep Oceans
  • Energy
  • Frequency
  • Group Velocity
  • Losses
  • Measurement
  • Oceans
  • Phase Velocity
  • Radiation Patterns
  • Rayleigh Waves
  • Surface Waves
  • United States
  • Virginia
  • Wave Power
  • Wave Propagation

Readers

  • Mathematics or Statistics
  • Seismology
  • Wave Propagation and Nonlinear Chaotic Dynamics.