An earthquake measuring 4.1 on the Richter scale rocked Bac Yen District in the northern province of Son La at 11:47 am on November 26, the Institute of Geophysics’ Seismic Observation Station reported.
|The Son La hydropower plant which is under construction was not affected by an earthquake 37 kilometers away November 26 that measured 4.1 on the Richter scale|
The epicenter was at a depth of 10-15 kilometers. The aftershocks were weak and the quake did not affect the Son La hydroelectric plant which is under construction 37 kilometers away, the station said .
The plant is likely to be affected by earthquakes measuring 6 and above.
People working in some office buildings in Hanoi 300 kilometers away felt the tremors.
Dr. Le Huy Minh, director of the Earthquake and Tsunami Warning Center, told the media that the earthquake was a minor one.
Information from the station shows that the Son La fault zone occasionally experiences tremors of below 3 on the Richter scale.
However, the center warned that construction projects in the area need to use earthquake-resistant techniques because of the latent threat of tremors.
Dr. Nguyen Quoc Cuong of the Geology Institute said studies just completed on the Son La fault zone by Vietnamese and Polish scientists reveal slight shifts in the tectonic plates in the area.