Long-Period Seismological Research Program

Abstract

Approximate detection thresholds of the VLP stations for long-period surface waves were determined. Based on a special listing of events for a one month time period, 90% of the reported shallow earthquakes down to m sub b = 4.2 were detected on the basis of Rayleigh or Love waves for epicentral distances as great as 30 degrees. For as many as 10% of the events that we observed, the detections were based on the observance of Love waves only. To date our results indicate that the VLP station EIL is the most effective station for discrimination between earthquakes and presumed explosions in central Asia. Signal enhancement techniques employing the VLP digital data appear to be able to lower the thresholds based on visual analysis of the seismograms by 0.2 to 0. 3 m sub b units.

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Document Details

Document Type
Technical Report
Publication Date
Apr 25, 1973
Accession Number
AD0760585

Entities

People

  • John M. Savino
  • Lynn R. Sykes

Organizations

  • Lamont–Doherty Earth Observatory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Asia
  • Atmospheric Motion
  • Central Asia
  • Contracts
  • Detection
  • Digital Data
  • Earthquakes
  • Explosions
  • Gravity Waves
  • Long Wavelengths
  • Love Waves
  • Measurement
  • New Jersey
  • Rayleigh Waves
  • Surface Waves
  • United States
  • Waves

Readers

  • Seismology
  • Systems Analysis and Design