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.