MANILA—A magnitude 4.6 earthquake struck off Zamboanga del Norte early Monday, Phivolcs said.
The tremor 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 while an Instrumental Intensity III was reported in the same area.