Using whale songs to image beneath the ocean’s floor – Ars Technica

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People tend to think of seismic waves as little more than signals of tectonic events, like an earthquake or lava shifting under a volcano. But these vibrations are also our best way of getting a clear picture of our planet’s internal structure. By watching how the vibrations’ paths shift as they encounter different materials, we can get a picture of where different rock layers meet, where rock becomes molten, and more.
In some cases, we get this picture by waiting…

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