Seismic Wave Propagation and Earthquake Characteristics in Asia

Abstract

The effects of subduction zones on local and teleseismic network data for earthquakes in the North Pacific have been determined. Hypocenter location, focal mechanisms and slip vectors are all perturbed in ways that can be corrected by tracing seismic rays through appropriate models of the upper mantle. The matching of synthetic seismograms for the first 30 seconds of the long period P signal with observations at several azimuths yields depths of crustal events to within 10 km and reliable estimates of focal mechanisms and source time functions. Spectral estimates for body waves based on the autocorrelation function, with a Hanning window, are more reliable than those by the FFT algorithm. Station spectra can be corrected reasonably well for source crust and receiver crust effects, but the proper way to model attenuation remains a difficult problem. The use of a frequency-dependent modulation of T/Q has been tested and seems promising.

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Document Details

Document Type
Technical Report
Publication Date
Oct 31, 1975
Accession Number
ADA020693

Entities

People

  • Carl Kisslinger
  • E. R. Engdahl
  • Ming-te Lin
  • R. Herrmann
  • T. Hewitt

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Algorithms
  • Computational Science
  • Computer Programs
  • Computers
  • Earth Models
  • Earthquakes
  • Frequency
  • North America
  • Phase Transformations
  • Phase Velocity
  • Seismic Waves
  • Spectra
  • Surface Waves
  • United States
  • Wave Propagation
  • Waveforms

Readers

  • Image Processing and Computer Vision.
  • Seismology
  • Wave Propagation and Nonlinear Chaotic Dynamics.