A magnitude 5.4 earthquake that is tectonic in origin shook Zamboanga del Norte on Thursday, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.
The quake, which the Phivolcs initially reported as magnitude 6.1, struck 5 kilometers southeast of Siocon at 11:41 a.m. It was 43 kilometers deep.
Intensity V was felt in Siocon; Ipil, Zamboanga Sibugay; and Isabela City.
Intensity IV was felt in Zamboanga City; Sibuco, Zamboanga del Norte; Dimataling, Zamboanga del Sur; and Alicia, Zamboanga Sibugay.
Intensity III was reported in Dipolog City and President Manuel A. Roxas, Zamboanga del Norte; Buug and Siay in Zamboanga Sibugay.
Intensity II was reported in San Jose, Antique; Himamaylan City, Negros Occidental; and Molave, Zamboanga del Sur.
Intensity I was reported in Kabankalan City, Negros Occidental.
The Phivolcs, meanwhile, recorded instrumental Intensity IV in Zamboanga City.
Reported intensity is the traditional way of knowing the intensity based on reports of people who felt the earthquake. On the other hand, instrumental intensity is determined using an intensity meter that measures ground acceleration.
The Phivolcs said that damage is not expected, but aftershocks are possible.
Earlier, a 5.8 earthquake also hit Southern Leyte. The tectonic quake struck 10.01 kilometers southeast of the municipality of San Francisco at 7:39 a.m. (PNA)