An Investigation of Attenuation, Scattering and Site Effects on Regional Phases.

Abstract

Investigation of regional phase amplitudes at a large number of LRSM sites showed a pronounced increase of Pn, Pg, and Lg amplitudes at sedimentary structures relative to hard rock. In the early part of the coda and the main part of the wavetrain for Lg, lower order modes generated by mode conversion at local inhomogeneities must be present to explain the site variations and the coherence structure of Lg. A modification of Aki's scattering theory is presented to explain such observations. Analysis of the late coda of Lg showed high crustal Q values at RKON and much lower values of OB2NV. At OB2NV the crustal Q appears to be frequency dependent, increasing from 200 to about 600 in the 1-10 Hz band. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 23, 1981
Accession Number
ADA105995

Entities

People

  • Anne O'donnell
  • Pamela J. Klouda
  • Zoltan A. Der

Organizations

  • Teledyne Technologies

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Background Noise
  • Contracts
  • Data Analysis
  • Detection
  • Elastic Waves
  • Group Velocity
  • New York
  • North America
  • Phase Velocity
  • Plastic Explosives
  • Scattering
  • Seismic Waves
  • Surface Waves
  • Two Dimensional
  • United States
  • Virginia
  • Wave Propagation

Readers

  • Seismology