Normally, volcanic islands are created above mantle plumes. These plumes are very big, hot rock formations that travel up from Earth's deep interior to cause bulges on the seafloor, upon which volcanic islands form. After millions of years, these bulges usually flatten out when volcanic activity ceases, and tectonic plates move away from the plume. Bermuda's volcanic structure is said to be quite unusual, as it did not follow this typical progression.
Presently, Bermuda sits upon a huge underwater bulge that is about 1,600 feet higher than the ocean floor around it, but the island provides no evidence of active mantle plumes beneath it. This puzzling question had long befuddled geologists.
To find the cause of the anomaly, scientists have analysed seismic waves produced by large earthquakes around the world. Seismic waves change speed depending on the kind of rock and material it travels through. Seismic wave data that was taken from stations on Bermuda was used to build a model of the underground structure, located approximately 20 miles beneath the island.
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Bermuda Triangle's mystery solved? Scientists discover hidden rock layer underground
Talking about the mysteries around the globe, the Bermuda Triangle have always secured a top position in the priority list. Known for its tales about ships and planes mysteriously vanishing, it has fueled conspiracy theories about supernatural forces, alien abductions, and even time travel.