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Massive fault could cause megaquake in Bangladesh

A massive fault could trigger a cataclysmic earthquake beneath Bangladesh, parts of east India and Myanmar, new research suggests, reports Live Science.

The hidden fault, which has been buried under miles of river sediment, could release an earthquake of magnitude 8.2 to 9.0 in one of the most densely populated regions of the world, the study found. And because researchers discovered the system relatively recently, they have no estimates for when such a megaquake could occur.

“We don’t know if it’s tomorrow or if it’s not going to be for another 500 years,” said study co-author Michael Steckler, a geophysicist at the Lamont-Doherty Earth Observatory at Columbia University in New York City.

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Hidden fault lines

In the low-lying, waterlogged country of Bangladesh, the mighty Ganges and Brahmaputra rivers meet and form the world’s largest delta, eventually draining into the Bay of Bengal. The flow of these two massive rivers deposits a gigaton of sediment every year, the researchers said. This constant overlay of sediment obscured the geology below the Ganges Delta. But in recent years, scientists have learned that tectonic plates are colliding beneath the eons worth of sediment.

To get a better picture of how the plates buried deep below the surface were moving, Steckler and his colleagues worked with researchers at Dhaka University in Bangladesh to install ultrasensitive GPS devices throughout Bangladesh between 2003 and 2014. They combined this data with plate-motion data collected from India and Myanmar, creating a map of the entire fault region.

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