Abstract: We present a robust factorization of the teleseismic waveforms resulting from an earthquake source into signals that originate from the source and signals that characterize the path effects. The extracted source signals represent the earthquake spectrum and its variation with azimuth. Unlike most prior work on source extraction, our method is data-driven, and it does not depend on any path-related assumptions e.g., the empirical Green’s function. Instead, our formulation involves focused blind deconvolution (FBD), which associates the source characteristics with the similarity among a multitude of recorded signals. We also introduce a new spectral attribute, to be called redshift, which is based on the Fraunhofer approximation. Redshift describes source-spectrum variation, where a decrease in frequency occurs at the receiver in the opposite direction of unilateral rupture propagation. Using the redshift, we identified unilateral ruptures during two recent strike-slip earthquakes. The FBD analysis of an earthquake, which originated in the eastern California shear zone, is consistent with observations from local seismological or geodetic instrumentation.
Bio: Pawan Bharadwaj is a postdoctoral associate with a joint appointment in the Department of Mathematics and Earth Resources Laboratory at MIT. His expertise is in inverse problems and signal processing relevant to seismic wave propagation and scattering. In 2016, he finished his PhD program in Geophysics at Delft University of Technology (TUDelft), The Netherlands. Previously, he obtained a Master of Science degree in Geophysics from Indian Institute of Technology (Indian School of Mines), Dhanbad, India.