Long-Period Seismological Research Program

Abstract

A technique for studying the focal mechanisms of small magnitude events at teleseismic distances was developed. By comparing observed amplitudes of long-period Rayleigh and Love waves with radiation patterns of focal mechanisms consistent with the previously determined tectonic regime of a certain region, it is possible to discriminate between different types of mechanisms on the basis of signals received at a very limited number of stations. The detection capabilities of the VLP station were evaluated using the special listing of events during the International Seismic Month. Surface waves were observed for 90% of the reported events of (m sub b) 4.6 or greater. Half of the unobserved events were due to masking by the coda of earlier larger events. For 10% of the events observed at deep stations, only Love waves were observed.

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Document Details

Document Type
Technical Report
Publication Date
Jun 14, 1974
Accession Number
AD0784837

Entities

People

  • John M. Savino
  • Lynn R. Sykes

Organizations

  • Lamont–Doherty Earth Observatory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Central Asia
  • Contracts
  • Detection
  • Digital Data
  • Explosions
  • Frequency
  • Geography
  • High Gain
  • Love Waves
  • Observation
  • Radiation Patterns
  • Rayleigh Waves
  • Seismographs
  • Surface Waves
  • Time Intervals
  • Waveforms
  • Waves

Readers

  • Seismology
  • Systems Analysis and Design