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Likely PKS-PKP from Array Processing of Noise Records
  • Tianze Liu,
  • Peter M. Shearer
Tianze Liu
University of California, San Diego, University of California, San Diego, University of California, San Diego

Corresponding Author:tianzeliu@gmail.com

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Peter M. Shearer
U.C. San Diego, U.C. San Diego, U.C. San Diego
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Seismic noise has been widely used to image Earth’s structure in the past decades as a powerful supplement to earthquake signals. Although the seismic noise field contains both surface-wave and body-wave components, most previous studies have focused on surface waves due to their large amplitudes. Here, we use array analyses to identify body-wave noise traveling as PKP waves. We find that by cross-correlating the array-stacked horizontal- and vertical-component data in the time windows containing the PKP noise signals, we extract a phase likely representing PKS-PKP. This phase can potentially be used for shear-wave splitting analysis and studying core-mantle boundary structure. Our results also suggest that the sources of body-wave noise are extremely heterogeneous in both space and time, which should be accounted for in future studies using body-wave noise to image Earth structure.
16 Apr 2022Published in Geophysical Research Letters volume 49 issue 7. 10.1029/2021GL097034