👉 Anchor sounds are the low-frequency rumbling vibrations that emanate from the ocean floor, often associated with underwater earthquakes or volcanic activity. These sounds can be felt as a constant vibration beneath the surface and are distinct from the higher-frequency sounds produced by marine life. These deep, resonant sounds are caused by the movement of tectonic plates and can travel long distances through water, making them useful for detecting seismic activity and studying oceanic geology.