Passive surface waves generated from ambient noise (mainly vehicle traffic) are generally low frequency and can have wavelengths that reach tens to hundreds of meters. In this study orientated arrays are investigated in a noisy area, to test the sensitivity of their dispersion curves, when high and low amplitude signals are coming from different directions. Data with energy mainly from one direction are compared with data that has confirmed maximum energy from a similar direction, but additional noise energy coming from other angles. Even if a spread is orientated in the direction of maximum source energy and the energy is stacked over the optimal azimuth, background noise especially in the lower frequency ranges, induces a shift to a higher phase velocity on the phase -velocity frequency diagram and a deformation across the phase velocity. I'm a PhD student and I would like to be considered for the AGAP-Quality Award.


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