HA NOI (VNS)— Two more earth tremors struck central Quang Nam Province's Bac Tra My District and Song Tranh Dam early yesterday morning, the latest in a series of tremors for the area which has suffered nearly 20 since the start of this month.
|Part of Song Tranh dam in central Quang Nam Province cracked as a result of earth tremors that hit the province's Bac Tra My District. — VNExpress Photo
The tremors, with a seismic focus at the depth of 5km, measured nearly 3 on the Richter Scale and lasted for approximately five seconds each.
No injuries or damages to the dam have been reported.
Doctor Le Van Dung of the Institute of Geophysics told Nguoi Lao dong (The Labourer) newspaper that the tremors cause more destruction on the surface than those with a deeper seismic focus.
Dang Phong, chairman of the Bac Tra My district's people's committee said the committee had dispatched its staff to inspect the affected area and help local people if necessary.
Earlier, experts from the Earthquake and Tsunami Warning Centre at the institute undertook a 10-day inspection of the troubled area.
They concluded that the sequence of tremors in this area follow the rule of earthquake excitation caused by by the eight of water storage of the hydropower plant reservoir of Song Tranh.
Experts said the sequence will come to an end if an earthquake of from 5 to 5.5 on the Richter scale strikes. This has never exceeded the reservoir's design limit.
With a seismic focus at a depth of 7.3km, the 4.2 Richter earthquake from a fortnight ago has been the strongest to strike so far.
Latest studies reveal that earlier tremors taking place in shear zones near Song Tranh hydropower plant reservoir have caused cracks and holes in nearly 20 local houses, two schools and several offices.
The management board of the hydropower plant plans to co-operate with local authorities to fix the affected houses and inspect other losses to provide solutions for local people.
Deputy Prime Minister Hoang Trung Hai has instructed the Ministry of Science and Technology, the Viet Nam Science and Technology Institute, the Institute of Geophysics and other relevant agencies to accomplish a specific study on the geological and earthquake conditions to report to the Prime Minister.
Nguyen Duc Hai, provincial party committee secretary also asked relevant agencies to set up contingency plans for future earthquakes and teach locals essential skills to protect themselves.
If necessary, people should be evacuated from dangerous areas, he added. — VNS