Long Period Seismological Research Program

Abstract

The most significant result of the data analysis pertinent to the earth-quake-explosion discrimination problem is based on the study of surface wave detection thresholds. Inclusion of data from the stations at Eilat, Israel, and Kongsberg, Norway show that long-period surface waves are observed from many shallow earthquakes located in central Asia with magnitudes between m sub b = 4. 1 and 4.5. These relatively low threshold values can often be lowered by 0.2 to 0.3 m sub b units by means of digital filtering techniques (polarization and azimuthal) thereby extending the applicability of the (m sub s) -(m sub b) discriminant to smaller magnitude events.

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Document Details

Document Type
Technical Report
Publication Date
Oct 25, 1972
Accession Number
AD0751960

Entities

People

  • John M. Savino
  • Lynn R. Sykes

Organizations

  • Lamont–Doherty Earth Observatory

Tags

Communities of Interest

  • Air Platforms
  • Autonomy
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Barometric Pressure
  • Central Asia
  • Contracts
  • Data Analysis
  • Databases
  • Detection
  • Digital Data
  • Earthquakes
  • Filters
  • High Gain
  • Love Waves
  • Observatories
  • Rayleigh Waves
  • Seismographs
  • Surface Waves
  • Universities
  • Waves

Fields of Study

  • Environmental science

Readers

  • Seismology