Residents and office workers in Manila were evacuated from high-rise buildings.
“I grabbed the money and our belongings and then I went out with my parents,” said Christina Gonzales, 19, after fleeing a city hotel.
Verified video footage posted on Facebook showed the Bantay Bell Tower in the popular tourist destination of Vigan partially crumbling.
Two visitors suffered minor injuries from falling debris, an official said.
Other buildings in the city were also damaged.
“We can’t rule out the possibility of another strong earthquake,” said Renato Solidum, director of the Philippine Institute of Volcanology and Seismology.
President Ferdinand Marcos Jr, whose family stronghold is in the north, said he would delay visiting the region to avoid causing disruption.
He urged people to remain in emergency shelters until their homes have been checked for damage.
Military personnel have been deployed to Abra to help with rescue operations.
At least 58 landslides have been reported, Interior Secretary Benjamin Abalos said.
National disaster agency spokesman Mark Timbal said road-clearing operations were under way. There had been no reports of damage to local dams.
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