Fig. 6: Noise correlation stacks.
From: Distributed acoustic sensing of microseismic sources and wave propagation in glaciated terrain
Recorded on 24 March 2019, the stack includes 1081 cross-correlations from 47 channels of the eastern triangle side binned within fixed distance intervals of 10 m. a Cross-correlations showing Rayleigh wave propagation at 1700 m/s. b Acausal part folded onto the causal part of the cross-correlation. Although the acausal SNR of the virtual surface wave is weaker than the causal one, comparison of the two nevertheless shows that some energy propagates in both directions along the cable. Bold traces show the highest symmetry between the causal and acausal waves.
