The development of ambient noise tomography has provided a powerful tool to investigate the Earth's subsurface with increased resolution. Most commonly, surface-wave tomography is performed on inter-station estimates of the vertical component of Rayleigh waves, stemming from crosscorrelations of ocean-generated noise. Here, we estimate the cross terms of the Rayleigh-wave Green tensor, and show this is less sensitive to signal not in-line with the seismic stations. We illustrate this result with the Batholiths temporary seismic deployment, showing estimates of the Rayleigh wave with a higher signal-to-noise ratio and a consequently better phase-velocity dispersion curve. This approach provides an opportunity for reliable ambient noise crosscorrelations over shorter time windows and more closely spaced stations in the future.
Copyright 2011 by the American Geophysical Union. DOI: 10.1029/2011GL047442
van Wijk, Kasper; Mikesell, T. Dylan; Schulte-Pelkum, Vera; and Stachnik, Josh. (2011). "Estimating the Rayleigh-Wave Impulse Response Between Seismic Stations with the Cross Terms of the Green Tensor". Geophysical Research Letters, 38L16301-1 - L16301-4.