Moment tensor solutions through waveforms inversion
Moment tensor solutions through waveforms inversion
ISBN: 978-88-98161-13-3
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Abstract:

The authors present a moment tensor inversion of waveforms, which is more robust and yields more stable and more accurate results than standard approaches. The inversion is performed in two steps. First, a point source of seismic waves is considered, with defined location and origin time. Matrix method is used to solve the problem of wave propagation in the medium modelled as a horizontally layered heterogeneous elastic structure (isotropic and/or anisotropic). A numerical technique, developed based on forward modeling, is used for the inversion of the observed waveforms for the components of moment tensor and the earthquake source-time function ( STF(t) ). Finally, the proposed moment tensor inversion is tested on real data for the earthquakes of 24.04.2011 (13h02m12s, 35.92N, 14.95E (close to Malta), Mw4.0) and 29.12.2013 (17h09m0.04s, 41.37N, 14.45 (Southern Italy), Mw4.9).