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

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 correc...

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Bibliographic Details
Main Authors: Syed, Atiq A, Nuttli, Otto W
Other Authors: SAINT LOUIS UNIV MO DEPT OF EARTH AND ATMOSPHERIC SCIENCES
Format: Text
Language:English
Published: 1972
Subjects:
Geology
Geochemistry and Mineralogy
Seismology
*EARTHQUAKES
ALEUTIAN ISLANDS
ATLANTIC OCEAN
CORRECTIONS
FAULTS(GEOLOGY)
INTENSITY
MATHEMATICAL ANALYSIS
OCEAN BOTTOM TOPOGRAPHY
SEISMOLOGICAL STATIONS
TABLES(DATA)
USSR
PLATE TECTONICS
PRIMARY WAVES
REPRINTS
Aleutian Island
Kamchatka
Aleutian Islands
Online Access:http://www.dtic.mil/docs/citations/AD0742029
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0742029
Description
Summary: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. Sponsored in part by the DARPA. Pub. in the Bulletin of the Seismological Society of America, v61 n6 p1811-1826 Dec 1971.

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