Abstract
In the context of the Comprehensive Nuclear-Test-Ban Treaty (CTBT), the hydroacoustic network gives the ability to state parties to check the natural and artificial activity in the oceans. To achieve this purpose, 11 hydroacoustic stations are going to be established. One of these stations has recently been launched by the CEA (France) near the Crozet Islands in the Indian Ocean. In this paper, we characterize the ambient noise of this new station. This study will enable one to estimate the detectability of the station. In this analysis, we associate the tide height with the noise level on the recorded signals. The lunar calendar perfectly matches the hydroacoustic noise variation. In addition, we will show the influence of this noise evolution on the rate of detection. In order to have a good statistic, we process a hundred days of data (recorded at 250 Hz). The tide heights supplied by ‘‘le Laboratoire de gophysique et Ocanographique de Toulouse,’’ are sampled with a 1-h step. Furthermore, the spectral characteristic of the ambient noise is also given. Finally, a comparison with other international stations, Diego Garcia (H08) and Cape Leeuwin (H01), is given.
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