Naslov
Point source moment tensor inversion through a Bayesian hierarchical model

Autori
Mustać, Marija ; Tkalčić, Hrvoje

Izvornik
Geophysical journal international (0956-540X) 204 (2016), 1; 311-323

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Time-series analysis ; Inverse theory ; Earthquake source observations ; Surface waves and free oscillations ; Computational seismology

Sažetak
Characterization of seismic sources is an important aspect of seismology. Parameter uncertainties in such inversions are essential for estimating solution robustness, but are rarely available. We have developed a non- linear moment tensor inversion method in a probabilistic Bayesian framework that also accounts for noise in the data. The method is designed for point source inversion using waveform data of moderate-size earthquakes and explosions at regional distances. This probabilistic approach results in an ensemble of models, whose density is proportional to parameter probability distribution and quantifies parameter uncertainties. Furthermore, we invert for noise in the data, allowing it to determine the model complexity. We implement an empirical noise covariance matrix that accounts for interdependence of observational errors present in waveform data. After we demonstrate the feasibility of the approach on synthetic data, we apply it to a Long Valley Caldera, CA, earthquake with a well-documented anomalous (non-double-couple) radiation from previous studies. We confirm a statistically significant isotropic component in the source without a trade-off with the compensated linear vector dipoles component.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA