Key Takeaways:
A magnitude 7.8 earthquake struck off the southern Philippines on Monday, triggering tsunami warnings across three nations and exposing 22 million people to moderate-to-severe shaking, the U.S. Geological Survey said.
"This is the strongest earthquake we've experienced," Benjie Ancheta, police chief of Alabel town in Sarangani province, told Reuters by phone, adding that the police building sustained cracks during the flag-raising ceremony.
The quake hit at 7:37 a.m. local time about 20 miles south of Maasim off Mindanao island, according to the Philippine Institute of Volcanology and Seismology. A series of aftershocks followed, including a magnitude 6.7 tremor at 8:55 a.m. Tsunami waves of 1 meter were monitored in Sultan Kudarat and Sarangani provinces, while an 83-centimeter wave was detected off Indonesia's Sulawesi island.
The Philippines sits on the Pacific "Ring of Fire," a seismically active belt that produces about 90 percent of the world's earthquakes. The last major quake to hit Mindanao was a magnitude 6.8 event in November 2023 that killed at least 11 people and triggered landslides. President Ferdinand Marcos Jr. ordered the suspension of all classes in affected areas and urged coastal residents to move to higher ground.
Damage concentrated in General Santos
General Santos, a tuna-processing hub of more than 700,000 people about 13 kilometers from the epicenter, suffered the most visible damage. A four-story commercial building partially collapsed, and debris from other structures struck parked tricycle taxis. Power and telecommunications were knocked out in parts of Sarangani province, local disaster chief Rene Punzalan said. Arlene Hollero, disaster chief of Maasim town, said a bridge suffered cracks and a shrine with a large cross collapsed.
The Pacific Tsunami Warning Center said waves reaching 1 to 3 meters above tide level were possible along some Philippine coasts, with smaller waves of 0.3 to 1 meter possible for parts of Indonesia and Malaysia. An advisory for Guam was lifted about two hours after the quake, and there was no threat to Hawaii, the center said.
Historical context and market impact
The Cotabato Trench, where the quake originated, has produced several destructive tsunamis in the past century. A magnitude 8.3 earthquake in the same trench system in 1976 generated a tsunami that killed an estimated 5,000 people along the Moro Gulf. Monday's quake struck at a depth of 10 kilometers, according to Phivolcs, though the USGS measured it at 55 kilometers — a discrepancy common after major seismic events.
The economic toll is still being assessed, but damage to infrastructure in General Santos — a key port city for the Philippines' tuna export industry — could disrupt supply chains for the country's fisheries sector, which accounts for about 1.5 percent of GDP. Insurance losses from Philippine earthquakes have historically ranged from $100 million to $500 million per event, according to catastrophe modeling firms. The Philippine peso traded flat against the dollar in early Asian session trading, with no immediate signs of currency stress.
This article is for informational purposes only and does not constitute investment advice.
