Since its first use by Aki (1966), seismic moment has been recognized as the most physically meaningful measure of the strength of the seismic source. The subsequent development of the moment magnitude scale further increased its usefulness, giving seismologists the opportunity to measure even the magnitude of very large events without concern about saturation effects. The routine computation of moment tensors and seismic moments has been made easier by the advent of efficient waveform inversion techniques. Dziewonski et al. (1981) pioneered the routine determination of moment tensors using teleseismic data for large events occurring worldwide....

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