Extracting long-period Love waves (> 40 s) from ambient noise using a selection stacking method
Extracting long-period Love waves (> 40 s) from ambient noise using a selection stacking method
Seismological Research Letters (February 2025) 96 (4): 2527-2539
- asthenosphere
- body waves
- crosscorrelation
- elastic waves
- geophysical methods
- guided waves
- lithosphere
- long-period waves
- Love waves
- Rayleigh waves
- S-waves
- seismic methods
- seismic waves
- SH-waves
- stacking
- statistical analysis
- surface waves
- United States
- velocity structure
- wave dispersion
- ambient noise methods
Currently, Rayleigh and Love waves extracted from ambient noise are widely used to constrain isotropic shear-wave velocities and radial anisotropy of the lithosphere in ambient noise tomography. However, retrieving Love-wave signals with periods longer than 40 or 50 s from ambient noise data remains a challenge. In this study, we report that reliable Love waves with periods of 40-80 s can be successfully retrieved from ambient noise using a root mean square ratio selection stacking (RMSR_SS) method. We further demonstrate that these broadband Love-wave signals, retrieved from approximately two years of ambient noise data, can be used to constrain phase velocity maps. The extraction of long-period Love waves from ambient noise provides supplementary data for the study of radial anisotropy in the lithosphere or asthenosphere.
