Tremors caused by Hydro-power plants: geophysicists


Tremors recorded last month in Bac Tra My and Nam Tra My districts in the central province of Quang Nam  were caused by the Tranh River hydro-power plant, concluded geophysicists from the Ministry of Science and Technology, after a month of field research of the area.


Tran Tuan Anh, director of the Institute of Geological Sciences and head of the research delegation, said these kinds of tremors, known as operational - induced quakes, were normal in areas where hydro-power plants are located.


He said they had no adverse affect on people living in close proximity of the plant.


The first tremors struck the region last January. At least three tremors have been recorded since November 16, causing aftershocks within a 30km radius.


Tremors of around 3.5 on the Richter scale would continue for a while, but gradually diminish in intensity, and the Tranh River hydro-power plant was built to withstand earthquakes of up to 5.5 on the Richter scale, said Son.


Similar tremors were recorded near the Hoa Binh and Son La hydro-power plants. The phenomenon normally last about five years.


Tremors have been recorded in other countries where hydro-power plants are located, such as near the Konya reservoir in India, where tremors lasted for decades.


Geophysicists have proposed that earthquake observation stations be built in Quang Nam to minimize any risks.

Source SGGP- Translated by Dan

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