Fourth earthquake in around two months struck the northern province of Thanh Hoa Saturday, panicking locals.
"It happened at around 4 a.m. and lasted 15 seconds," said Lo Dinh Mui, a local official of Quan Son District.
"Luckily as in the three previous cases, no one was killed."
Yet Mui said the latest earthquake has been stronger than the other ones, registering 4.0 on the Richter scale, compared to 3.5-3.8.
Nguyen Ngoc Huynh, a local teacher, said his school's teacher dormitory has developed cracks in its walls after the latest quake.
The building shook so strongly that everyone ran outside fearing it would collapse, Huynh said.
Cracks have also appeared at a local nursery school, residents' homes and roads.
People avoided concrete high-rises that morning fearing possible consequences from the quake.
This is the fourth tremor to strike the district since September 19. The second one occurred on September 22 and the third on Monday, November 22.
Mui has asked provincial and central government's agencies to study the area and set up seismic monitor stations to warn the area's thousand residents of any further quakes.