A quake measuring 2.3 on the Richter scale took place eight kilometers under the waters off Ky Anh District, the central province of Ha Tinh 11 seconds after 3:42 a.m. on October 22, announced Institute of Geophysics.

Some 2,000 houses have been damaged by a series of earthquakes as strong as 5.4 magnitude that hit the southeastern city of Pohang last week, the Ministry of Interior and Safety said Sunday.