A recent study has uncovered that a major earthquake around 2,500 years ago significantly rerouted the Ganges River in Bangladesh, marking the first documented instance of seismic activity causing a river avulsion. This discovery highlights the ongoing geological risks in delta regions, which could impact millions of people if repeated today. Credit: SciTechDaily.comreveals that a massive earthquake 2,500 years ago dramatically shifted the course of one of the world’s largest rivers.
The lowlands of Bangladesh are in many places an elaborate mixture of land and water that sometimes change places. Credit: Steve GoodbredThe Ganges rises in the Himalayas and flows for some 1,600 miles, eventually combining with other major rivers including the Brahmaputra and the Meghna to form a labyrinth of waterways that empty into a wide stretch of the Bay of Bengal spanning Bangladesh and India. Together, they form the world’s second-largest river system as measured by discharge.
In satellite imagery, the authors of the new study spotted what they say was probably the former main channel of the river, some 100 kilometers south of the Bangladeshi capital of Dhaka. This is a low-lying area about 1.5 kilometers wide that can be found intermittently for some 100 kilometers more or less parallel to the current river course. Filled with mud, it frequently floods, and is used mainly for rice cultivation.
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