Utility of Tsai's Method for Seismic Discrimination

Abstract

An automatic spectral-fitting procedure based on a simple least- squares error criterion is devised for determining the source parameters of earthquakes from surface wave data. When this procedure is supplemented by the complex cepstrum technique for removing the spectral modulations due to multipath interference, results are significantly improved. Rayleigh and Love wave spectral data recorded by the VLPE network and the NORSAR long-period array for fifty-one earthquakes in the Eurasian continent are processed by this procedure. The results are discussed on a regional basis. It is found that the surface wave spectral characteristics may vary even among earthquakes located in essentially the same epicentral region. However, the variations are not random but follow certain distinct patterns. With proper data coverage the focal depths of relatively small earthquakes can be estimated within a 20-km range by employing jointly the automatic spectral-fitting procedure and the complex cepstrum technique.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1972
Accession Number
AD0765190

Entities

People

  • Wen-wu Shen
  • Yi-ben Tsai

Organizations

  • Texas Instruments

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Asia
  • Availability
  • Cepstrum Technique
  • Contracts
  • Earth Models
  • Frequency Bands
  • Love Waves
  • Measurement
  • Models
  • Multipath Interference
  • Radiation Patterns
  • Rayleigh Waves
  • Scientific Research
  • Seismic Discrimination
  • Surface Waves
  • Test And Evaluation

Readers

  • Regression Analysis.
  • Seismology