Article,
A fast evaluation of the seismic moment tensor for induced seismicity
Bulletin of the Seismological Society of America, 90 (6): 1521--1527 (Dec 1, 2000)
DOI: 10.1785/0120000034
Abstract
An original method is proposed for the evaluation of moment tensor
components using time-domain calculations of low-frequency displacement
amplitudes with the first-wave polarities attached. The technique
is suitable for applications involving large amounts of data that
require a fast response time, such as those encountered in the analysis
of induced seismicity. Simulation tests indicate an excellent agreement
with inversions based on the far more labor intense spectral processing.
The overall results of waveform simulation analysis allow the conclusion
that this inversion approach is reliable in retrieving the geometrical
aspects of the seismic source. Inversions for the pure-shear mechanism
and a general mechanism, including a tensile component, are shown
to be robust for various wave-type solutions, under reduced array
coverage, hypocentral mislocation, and the addition of Gaussian normally
distributed noise. The influence of errors in first-arrival polarities
and low-frequency displacement amplitudes are subsequently studied
for a better understanding of the applicability limits.
