Disaster drills helped prevent more deaths when powerful quake hit the southern Philippines

The numbers of dead and missing were considerably lowered after multiple verifications, the Office of Civil Defense said in a statement.

Many of the displaced were still too traumatized to return home because of strong aftershocks, officials said.

Days after the earthquake hit, more videos of the chaotic moments have been posted on social media showing horrified crowds witnessing the collapse of small buildings, and flag-raising ceremonies turning chaotic when the ground started to shake on the first day of school after a long summer break.

Students are seen on videos screaming in panic, but staying seated or standing still outside school buildings, with some covering their heads with their hands as teachers admonished them to calm down.

One video, which has gone viral on Facebook with millions of views, showed dozens of grade-schoolers screaming and breaking into tears as they sat on a tree-ringed school ground, which visibly swayed them from side to side. A tin roof shed nearby later collapsed with a loud thud, prompting many to dash away, but were asked by teachers to return and stay seated.

The grade school in the coastal town of Malita in Davao Occidental province reported no injuries from the quake.

"This incident serves as a reminder of the importance of earthquake preparedness and the value of regular disaster response drills," the Mahayahay elementary school said in a statement.

Teresito Bacolcol, director of the Philippine Institute of Volcanology and Seismology, said years of disaster-preparedness drills helped people anticipate and brace for extreme events like Monday's quake, one of the strongest to hit the archipelago in a half-century.

He said that it was also fortunate that the quake hit at 7:37 a.m., a few minutes before work and classes were to start indoors.

"It's good that our efforts to educate people on what to do when earthquakes hit somehow paid off," Bacolcol told The Associated Press.

He expressed concern, however, over the collapse of some buildings that he said should have withstood the powerful quake, if construction standards based on the country's building code were followed.

Ednar Dayanghirang, director of the Office of Civil Defense in a quake-hit region of about 5 million people, said that regular disaster-preparedness drills helped reduce casualties in many ways, including by preventing deadly stampedes.

"We required all school principals to take one-day courses on incident management, then they appointed disaster-response teams among teachers to deal with earthquakes, tsunamis," Dayanghirang said. "They listened and they learned."

The Philippines, one of the world's most disaster-prone countries, is often hit by earthquakes and volcanic eruptions because of its location on the Pacific "Ring of Fire," an arc of seismic faults around the ocean.