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Journal Articles Geophysical Journal International Year : 2013

On measuring surface wave phase velocity from station-station cross-correlation of ambient signal

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Abstract

We apply two different algorithms to measure surface wave phase velocity, as a function of frequency, from seismic ambient noise recorded at pairs of stations from a large European network. The two methods are based on consistent theoretical formulations, but differ in the implementation: one method involves the time-domain cross-correlation of signal recorded at different stations; the other is based on frequency-domain cross-correlation, and requires finding the zero-crossings of the real part of the cross-correlation spectrum. Furthermore, the time-domain method, as implemented here and in the literature, practically involves the important approximation that interstation distance be large compared to seismic wavelength. In both cases, cross-correlations are ensemble-averaged over a relatively long period of time (1 yr). We verify that the two algorithms give consistent results, and infer that phase velocity can be successfully measured through ensemble-averaging of seismic ambient noise, further validating earlier studies that had followed either approach. The description of our experiment and its results is accompanied by a detailed though simplifed derivation of ambient-noise theory, writing out explicitly the relationships between the surface wave Green's function, ambient-noise cross-correlation and phase and group velocities.
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Dates and versions

hal-00828735 , version 1 (31-05-2013)

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Lapo Boschi, Cornelis Weemstra, Julie Verbeke, Göran Ekström, Andrea Zunino, et al.. On measuring surface wave phase velocity from station-station cross-correlation of ambient signal. Geophysical Journal International, 2013, 192, pp.346-358. ⟨10.1093/gji/ggs023⟩. ⟨hal-00828735⟩
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