The German Research Centre for Geosciences issued tsunami warnings after a 7.8-magnitude earthquake struck off Mindanao in the southern Philippines.
The quake, which occurred at a shallow depth of about 10 km, forced coastal evacuations and disrupted power and communications in areas near the epicentre.
Authorities in the Philippines, Indonesia, and international monitoring agencies issued tsunami alerts, urging people living along vulnerable coastlines to move to higher ground.
Tsunami waves exceeding one metre above normal tide levels could hit affected coastal areas, with waves of up to three metres expected along some Philippine coastlines.
Smaller waves could be expected in Taiwan, Japan, Guam, Papua New Guinea, and several Pacific island territories, while no tsunami threats have been detected in Thailand and San Francisco as of now.