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. Icequakes are the result of processes occurring withinthe ice mass or between the ice and its environment. Studying icequakesprovides a unique view on ice dynamics, specifically on the basalconditions. Changes in conditions due to environmental or climate changes are reflected in icequakes. Counting and characterizing icequakes is thus essential to monitor them. Most of the icequakes recorded by the seismicstation at the Belgian Princess Elisabeth Antarctica Station (PE) have smallamplitudes corresponding to maximal displacements of a few nanometres. Theirdetection threshold is highly variable because of the rapid and strongchanges in the local seismic noise level. Therefore, we evaluated theinfluence of katabatic winds on the noise measured by the well-protected PEsurface seismometer. Our purpose is to identify whether the lack of icequake detection during some periods could be associated with variations in theprocesses generating them or simply with a stronger seismic noise linked tostronger wind conditions. We observed that the wind mainly influencesseismic noise at frequencies greater than 1 Hz. The seismic noise powerexhibits a bilinear correlation with the wind velocity, with two differentslopes at a wind velocity lower and greater than 6 m s−1 and with, for example at a period of 0.26 s, a respective variation of 0.4 dB (m −1 s) and 1.4 dB (m −1 s). These results allowed a synthetic frequency and wind-speed-dependent noise model to be presented that explains the behaviour of the wind-induced seismic noise at PE, which shows that seismic noise amplitude increasesexponentially with increasing wind speed. This model enables us to study the influence of the wind on the original seismic dataset, which improves the observation of cryoseismic activity near the PE station.

Wind-induced seismic noise at the Princess Elisabeth Antarctica Station