Speaker
Description
Here, we use coda measurements and apply the waveform envelope spectral ratio method to obtain the measurements necessary for source discrimination and to determine absolute yield and depth of burial at globally distributed test sites. Studies of high‐frequency (>~1 Hz) source processes are crucial for both event discrimination and yield/magnitude determination of smaller seismic events. However, it is difficult to use conventional waveform methods due to the random heterogeneities in the Earth which cause scattering and produce incoherent wave trains in seismograms. To overcome this computational limitation, we neglect the seismic phase information in observed seismic waveforms and instead only utilize envelopes and/or spectrograms. Spectral ratios of envelopes of coda waveforms provide a high precision tool to study the distribution of the energy radiated by the source without requiring any prior calibration. The goal of this work is to develop a capability which allows us to better understand seismic coda and the source processes which generate it. This work demonstrations advancements in our understanding of the use of coda methods for seismic source characterization and seeks to expedite its implementation in operational settings.
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