A Method of Correcting P-Wave Magnitudes for the Effect of Earthquake Focal Mechanism

Abstract

The paper presents a methodology for correcting body-wave magnitudes for the effect of focal mechanism in a routine manner. The method requires a knowledge of the prevailing or dominant mechanism for a geographic region, from which tables are constructed which enable one to make the necessary correction. Included in the paper are tables for Aleutian Island, Kamchatka and mid- Atlantic Ocean earthquakes. From a study of seven earthquakes, it is concluded that the present method gives essentially the same average magnitude with the same standard deviation as a more exact method of correcting for the focal mechanism. The latter method uses the focal-mechanism parameters of the earthquake, which must be determined independently for each earthquake.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1972
Accession Number
AD0742029

Entities

People

  • Atiq A. Syed
  • Otto W. Nuttli

Organizations

  • Saint Louis University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Aleutian Islands
  • Amplitude
  • Atlantic Ocean
  • Atmospheric Sciences
  • Contracts
  • Earthquakes
  • Epicenters
  • Equations
  • Geographic Regions
  • Islands
  • Latitude
  • New York
  • Plate Tectonics
  • Radiation Patterns
  • South America
  • United States

Readers

  • Regression Analysis.
  • Seismology
  • Systems Analysis and Design