MANILA (UPDATE) — A magnitude 4.9 earthquake struck off Zamboanga del Norte early Monday, Phivolcs said.
The tremor initially recorded at magnitude 4.6, happened at 6:29 a.m., 35 kilometers northwest of Siocon town.
It was tectonic in origin and had a depth of 25 kilometers, according to Phivolcs.
The tremor was not expected to cause damage and aftershocks.
Intensity IV was felt in Zamboanga City, and Sipocot and Sirawai towns in Zamboanga del Norte, while Intensity III was felt in Ipil, Zamboanga Sibugay.
Instrumental Intensity III was also reported in Zamboanga City.