Effect of Crustal Structure on Lg

Abstract

The transverse component of the regional phase L sub g was synthesized by the superposition of higher-order Love-wave modes at frequencies of up to 2.5 Hz. The synthetic seismograms represent the signals which would be generated by earthquakes at various depths in a tectonic shield. Two alternative earth models were also used: one in which the shield structure was overlain by 2 km of low-velocity sediments, and another in which this sedimentary layer was further assumed to be highly attenuating. The synthetics were used to calculate the amplitude-versus-distance relations for L sub g and to analyze its phase- velocity structure as a possible depth discriminant. Keywords include: L sub g attenuation, Synthetic seismogram.

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Document Details

Document Type
Technical Report
Publication Date
Oct 09, 1980
Accession Number
ADA153859

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  • D. W. Rivers

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  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Coefficients
  • Computer Programs
  • Earth Models
  • Frequency Bands
  • Frequency Domain
  • Geophysics
  • Measurement
  • North America
  • Phase Velocity
  • Rayleigh Waves
  • Scattering
  • Security
  • Seismic Waves
  • Shallow Depth
  • Shear Modulus
  • United States
  • Waveforms

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