Time and Amplitude Fluctuations of Teleseismic P-Signals at NORSAR in view of Wave Scattering Theory

Abstract

Theory for wave propagation in inhomogeneous media is used in a critical examination of observed P-wave travel time and amplitude anomalies. The NORSAR array data analysed exhibits several features predicted theoretically assuming the crust and upper mantle to be randomly inhomogeneous. It is demonstrated that in modelling plane wave time deviations a better fit to the observations is obtained by including a stochastical term in the plane wave equation. It is also demonstrated that wave scattering effects is of critical importance for seismic velocity estimation when using data from small aperture arrays. In such cases, a spatial sampling of the area under investigation is recommended in order to obtain reliable velocity estimates.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1975
Accession Number
ADA017188

Entities

People

  • A. Dahle

Organizations

  • Royal Norwegian Council for Scientific and Industrial Research

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Cartesian Coordinates
  • Coordinate Systems
  • Cross Correlation
  • Data Analysis
  • Data Science
  • Earth Models
  • Elastic Waves
  • Information Science
  • Measurement
  • Refractive Index
  • Scattering
  • Seismic Arrays
  • Seismic Velocity
  • Seismic Waves
  • Statistical Analysis
  • Statistical Distributions
  • Wave Propagation

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Seismology
  • Theoretical Analysis.