Long-period seismic modelling of earthquakes: comparisons with geodeticresults and the importance of 3D Earth structure

Abstract:

In this study we carry out long-period seismic source inversions
using various global tomopraphic models and modelling strategies for over
30 large shallow earthquakes that were previously studied using
Interferometric Synthetic Aperture Radar (InSAR) data. InSAR methods
provide an alternative and independent way of locating and characterising
shallow continental earthquakes. Thus, comparisons of our source
parameters with those obtained using InSAR are a novel way to assess
limitations in the InSAR models as well as the effects of inaccurate wave
propagation formulations and/or 3D Earth structure on seismic source
determinations. We carry out comparisons for first-order earthquake source
parameters: location, seismic moment and focal mechanism and discuss
various observed trends and their implications.