Abstract
Summary The Earthquake Mechanism Laboratory performed seismic noise experiments at the Norwegian Seismic Array (NORSAR) during the winter of 1968–1969. Coherence estimates, made for the seismic noise field, show azimuthal dependency as well as pronounced secondary maxima. The observed cross-spectra can be explained by an interference process of seismic waves approaching from different directions. For a constant seismic wave velocity, the model cross-spectra give frequency-dependent time differences between sensors. Comparisons between the modelled and real cross-spectral estimates show good agreement.
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