Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pepi..130...17n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 130, Issue 1-2, p. 17-29.
Physics
3
Scientific paper
It is important to determine accurate focal mechanism solutions for earthquakes with small magnitudes or those recorded by a small number of seismometers, perhaps with an unfavorable geographic distribution. A method using initial motion polarity of S waves, in addition to P waves, is described. This method can be applied routinely to determine the focal mechanism solution of earthquakes which occur all over Japan where a nationwide earthquake observation network of high sensitivity seismographs at a few tens of kilometers interval will soon be available. We define /Q to be a weighted sum of inconsistencies between observed and calculated polarities. Double-couple focal mechanisms are searched to determine the solution that produces the smallest misfit Qmin, and the set of acceptable mechanisms: Q<=Qmin+1.5. The uncertainty of each principle axis is expressed as the maximum angle between the best solution and all the acceptable solutions.
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