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Bulletin of the Seismological Society of America; December 1993; v. 83; no. 6; p. 1871-1880
© 1993 Seismological Society of America
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Display and assessment of earthquake focal mechanisms by vector representation

STUART A. SIPKIN

U.S. GEOLOGICAL SURVEY, MS 967, BOX 25046, DFC, DENVER, COLORADO 80225

Abstract

The isomorphism between symmetric, three-dimensional, second-order tensors and six-dimensional vectors is exploited to display suites of seismic moment tensors and to asses their similarities and differences, both graphically and quantitatively. Using the southern Mid-Atlantic Ridge as an example, I show that this method successfully differentiates between different mechanism types and orientations. In addition, the dispersion within a group of mechanisms is successfully quantified.






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