Overview
- The low-frequency sound was recorded off Florida in 1997 and puzzled scientists for years.
- Because it resembled an amplified whale call, some initially suspected an unknown giant marine creature.
- Geographers advanced non-biological possibilities, including undersea volcanic activity and shifting tectonic plates.
- NOAA’s PMEL identified the cause in 2005 after deploying hydrophones closer to the Southern Ocean, tracing it to an iceberg calving event.
- Recent coverage reiterates the icequake conclusion, notes links to increasing calving with warming, and highlights continuing online skepticism.