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Bulletin of the Seismological Society of America; February 1989; v. 79; no. 1; p. 85-100
© 1989 Seismological Society of America
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Display and assessment of seismic moment tensors

MARK A. RIEDESEL and THOMAS H. JORDAN

INSTITUTE FOR GEOPHYSICS UNIVERSITY OF TEXAS, AUSTIN, TEXAS 78759
DEPARTMENT OF EARTH, ATMOSPHERIC AND PLANETARY SCIENCES MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS 02139

Abstract

Any moment-rate tensor can be expressed as Formula, where MT is the total scalar moment and M^ is the source mechanism, a symmetric tensor of unit Euclidean norm describing the geometry of the source. We present a method for the graphical display of the second-order tensor M^ and its uncertainties, the latter specified by a fourth-order covariance tensor, var[M^]. The display allows the statistical significance of non-double-couple components to be tested by inspection. It is also useful in evaluating the frequency dependence of the source and assessing differences among moment-tensor estimates. We provide a detailed description of the plotting method and some examples of its application to source-mechanism spectra recovered from IDA data, including an earthquake in the Kermadec Islands that has a large non-double-couple component.




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