Theoretical studies have demonstrated that the amplitude spectra of the seismic waves generated by finite moving sources have sequences of minima. The frequencies at which these minima appear are related to the dimensions of the earthquake fault area and the velocity of rupture. In addition the amplitude of the body waves is azimuthally modulated by a moving source in a characteristic manner. In the present study we have utilized the spectra of long-period P waves and the amplitude of SH waves to select the fault plane, and to determine bounds on the area of faulting and the velocity of rupture in the case of a deep focus earthquake which occurred in Brazil.

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