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Hydrophones installed by the Comprehensive Test Ban Treaty Organization network around the Diego Garcia island pick up a variety of low frequency sounds. The acoustic sounds come from different areas of the Indian Ocean. The island and the surrounding bathymetry however scatter the incoming sound. The bottom topography is significantly complicated that the location is an atoll, overlooking the deep Chagos trench, and also surrounded by several small islands. This bathymetry blocks some of the sound, and also refracts the signals. This makes interpreting the sounds challenging. Acoustic propagation models for the incoming sound will help interpret the observations, and to locate the sound sources. This paper suggests a three dimensional coupled mode-parabolic equation numerical method to model the acoustic scattering from frequencies of 5 Hz to 100 Hz. The model predicts both mode coupling, and diffraction effects. This predictions are then used to interpret the baleen whale sounds recorded at the Diego Garcia station.
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