Indian Ocean Geoid Low

The Indian Ocean Geoid Low (IOGL) is a gravity anomaly in the Indian Ocean. A circular region in the Earth's geoid, situated just south of the Indian peninsula, it is the Earth's largest gravity anomaly. It forms a depression in the sea level covering an area of about 3 million km2 (1.2 million sq mi), almost the size of India itself. Discovered in 1948 by Dutch geophysicist Felix Andries Vening Meinesz as a result of a ship's gravity survey, it remains largely a mystery. In May 2023, the weak local gravity was attempted to be explained through a hypothesis that used computer simulations and seismic data.

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