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Wiley InterScience | |||
  Geophysical Journal InternationalVolume 171 Issue 1, Pages 411 - 418 Published Online: 7 Aug 2007 Journal compilation © 2010 RAS Published on behalf of the Royal Astronomical Society
Abstract | References | Full Text: HTML, PDF (Size: 783K) | Related Articles | Citation Tracking  Simplified algorithms for calculating double-couple rotation Copyright 2007 The Author Journal compilation © 2007 RAS KEYWORDS earthquake-source mechanism • fault-plane solutions • inverse problem • seismic moment • seismotectonics • statistical methods ABSTRACTWe derive new, simplified formulae for evaluating the 3-D angle of earthquake double-couple (DC) rotation. The complexity of the derived equations depends on both accuracy requirements for angle evaluation and the completeness of desired solutions. The solutions are simpler than my previously proposed algorithm based on the quaternion representation designed in 1991. We discuss advantages and disadvantages of both approaches. These new expressions can be written in a few lines of computer code and used to compare both DC solutions obtained by different methods and variations of earthquake focal mechanisms in space and time. Accepted 2007 June 27. Received 2007 June 27; in original form 2007 May 5 | 
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