An earthquake, the strongest since 1957, occurred last night in Quang Nam Province's Bac Tra My District, where the Song Tranh 2 Hydropower Plant is located, panicking thousands of local residents.
A series of tremors measuring 4.6 on the Richter scale broke out in the district at 9:42 pm Monday and lasted for about three seconds, said Le Van Tuan, chief of the district People's Committee's Secretariat.
http://www.sott.net/article/252709-Earthquake-strikes-Viet-Nam-Strongest-since-1957