Event Detection and Location Capabilities at NORSAR

Abstract

Data published in the NORSAR seismic bulletin between February and June 1972 has been studied in order to find estimates of the detectability and location accuracy at NORSAR. The detectability is calculated from empirical frequency-magnitude distributions, and the 90% cumulative detectability for the teleseismic zone (30 degrees < delta < 90 degrees) has been estimated at (m sub b) 4.0, while values for different regions vary from 3.7 to 4.3. These are all NORSAR magnitudes. The magnitude bias between NOAA and NORSAR has been found to be 0.15 plus or minus 0.31 in the teleseismic zone. In this zone, the median location difference between NOAA and NORSAR has been estimated at 160 km, with values for different regions ranging from 130 to 340 km.

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Document Details

Document Type
Technical Report
Publication Date
Dec 29, 1972
Accession Number
AD0757204

Entities

People

  • H. Bungum

Organizations

  • Royal Norwegian Council for Scientific and Industrial Research

Tags

DTIC Thesaurus Topics

  • Air Force
  • Arrays
  • Asia
  • Background Noise
  • Central Asia
  • Contracts
  • Data Processing
  • Detection
  • Frequency
  • Frequency Bands
  • Image Processing
  • Industrial Research
  • North America
  • Seismic Arrays
  • Statistical Analysis
  • Statistical Distributions
  • United States

Readers

  • Seismology