Application of temporal reweighting to ambient noise cross-correlation for improved seismic Green's function

Jiangtao Li, Richard L. Weaver, John Y. Yoritomo, Xiaodong Song

Research output: Contribution to journalArticlepeer-review

Abstract

Due to the partly diffuse character of ambient noise, the retrieval of amplitude information and attenuation from noise cross-correlations has been difficult. Here, we apply the temporal reweighting method proposed by Weaver & Yoritomo to seismic data from the USArray in the central-midwest US. The results show considerable improvements in retrieved Green's functions in both symmetry and causality. The reweighting is able to make the effective incident noise field more isotropic (though not yet truly isotropic). It produces more robust amplitude measurements and also makes both the causal and anticausal parts usable. This suggests that it could be widely applicable for retrieval of Green's functions from ambient noise for attenuation study. The results also suggest an alternative measure of signal-to-noise ratio that complements the conventional one.

Original languageEnglish (US)
Pages (from-to)265-272
Number of pages8
JournalGeophysical Journal International
Volume221
Issue number1
DOIs
StatePublished - Apr 1 2020

Keywords

  • Seismic attenuation
  • Seismic interferometry
  • Seismic noise
  • Surface waves and free oscillations

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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