Abstract
For a planar shear earthquake source with monotonous slip at a given point, power moments of the slip rate function provide a useful means of reconstructing a space-time source structure. In theory, even a smoothed source function can be uniformly estimated. Power moments are linear functions of the processed data. We have developed a practical technique for estimating the source power moment of degrees 1 and 2 from the body wave pulses of deep earthquakes. The technique is applied to a moderate ( m b = 5.7 ) event in the Fiji Islands. We determined the source plane, elongation direction, length and duration values, degree of asymmetry and possible rupture velocity. Most estimates are independent from any particular parametric source model, although the Haskell-Aki partly bilateral model agrees well with our observations.
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