Why are there so few hydroacoustic stations when the earth is primarily water?

The IMS hydroacoustic monitoring network comprises eleven stations covering the world’s oceans, which make up 70% of the surface area of the earth. That so few stations are sufficient to cover these vast distances is due to the extremely efficient propagative properties of water and the distribution of acoustic energy in the ocean. For more information on how the IMS hydroacoustic technology works, please click here …

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