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With depleting terrestrial resources of minerals, energy and food, mankind has started exploring and exploiting the seas around us for various resources that the ocean offers. This has resulted in increased anthropogenic operations in the ocean that are largely detrimental in nature even from the acoustical soundscape perspective. This perhaps may cause an irr-repairable damage to the marine ecosystem. As any sound or noise in the ocean propagate extremely efficiently underwater. This eventually interferes with the natural soundscape of the ocean, upon which the marine ecosystems existence relies. Hence today the stakeholders carrying out industrial activities in the marine environment are under immense pressure to assess the effects of such operations on marine life. One of the best emerging technique to understand the soundscape of marine ecosystem is passive acoustic monitoring (PAM). This paper deals with the data acquisition and study of soundscape belonging to a tranquil marine environment over a large bank along the central west coast of India, approximately 65 nautical miles away from the closest shoreline. The Angria bank believed to be a shallow sunken atoll bounded by coral reef along its rim with a plateau of 540 sq. km having a minimum depth of 22m and above all, it truly represents an open sea scenario unlike many other coral reefs sites. The marine soundscape study provides a deeper understanding of the ambient noise of a healthy reef environment, which is largely contributed by the chorus from snapping shrimps. Preliminary observation indicate diurnal variation in the intensity of chorus in time as well as frequency domain. Further, cross-correlation and recurrence quantification analysis might revels tidal dependence as well as a methodology to monitor anthropogenic activities in the sea. The technique could successfully detected and distinguished sound bursts form a survey vessel operating various types of SONAR equipment. Attempt have also been made in the study to develop localisation and interpret the trajectory of vessel movement by implementing reduced signal strength method. In this manner, soundscape studies employing PAM device that can be treated as a non-invasive passive remote sensing method might reveal a plethora of information about the marine ecosystem.
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