Narrow and Broad Region Dispersion of Long-Period Surface Waves

Abstract

Examples of both narrow and broad region dispersion analysis for long-period surface waves are presented. Narrow region dispersion analysis of Kuriles/Kamchatka earthquake signals recorded at Guam, by means of moving-window maximum entropy spectral analysis, indicates strong multipathing in the 3.0 to 4.5 km/sec group velocity range, causing poor polarization filter performance. In contrast, between 2.0 and 3.0 km/sec the signals are well defined, resulting in a good polarization filter response. The dispersion for this region seems quite diverse. Broad region dispersion models for the North American and Asian continents were generated using previously reported group velocity data for Nevada Test Site and Eastern Kazakh presumed nuclear explosion signals recorded at world-wide stations. These models facilitate frequency-dependent surface wave magnitude measurement.

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Document Details

Document Type
Technical Report
Publication Date
Oct 11, 1978
Accession Number
ADA066735

Entities

People

  • Rudolf Unger

Organizations

  • Texas Instruments

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Composite Materials
  • Continents
  • Databases
  • Frequency
  • Frequency Bands
  • Group Velocity
  • Measurement
  • North America
  • Nuclear Explosions
  • Power Levels
  • Rayleigh Waves
  • Surface Waves
  • Travel Time
  • Wave Propagation
  • Waveforms
  • Waves

Readers

  • Seismology