HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Using instantaneous phase coherence for signal extraction from ambient noise data at a local to a global scale

Abstract : Stacks of ambient noise cross-correlations are more and more routinely used to extract empirical Green's functions between station pairs. The success of the cross-correlations is due to waves which are recorded by both stations and that constructively sum at lag times which equal their propagation time between the station pair. Stacking cross-correlograms corresponding to different time spans improves the azimuthal noise coverage and further enhances the signals. Here we show how the instantaneous phase coherence can be used for a more efficient signal extraction from ambient noise cross-correlations. The instantaneous phase coherence is obtained by analytic signal processing and can be employed through the phase cross-correlation and/or through the time-frequency domain phase-weighted stack. The phase cross-correlation is more sensitive to waveform similarity but less sensitive to strong amplitude features than the conventional cross-correlation. The time-frequency domain phase-weighted stack cleans the ambient noise cross-correlograms by attenuating incoherent noise and permits an improved signal identification. We show that both approaches are powerful tools in the recovery of signals from ambient noise data and show examples where they improve the extraction of P and Rayleigh waves by considering local and global scale applications.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03606511
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Friday, March 11, 2022 - 7:32:57 PM
Last modification on : Sunday, March 13, 2022 - 3:25:50 AM

File

184-1-494.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Citation

M. Schimmel, E. Stutzmann, J. Gallart. Using instantaneous phase coherence for signal extraction from ambient noise data at a local to a global scale. Geophysical Journal International, Oxford University Press (OUP), 2011, 184, pp.494-506. ⟨10.1111/j.1365-246X.2010.04861.x⟩. ⟨insu-03606511⟩

Share

Metrics

Record views

29

Files downloads

2