A 5.1-magnitude earthquake struck off the coast of Zambales on Thursday afternoon, March 11, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.
Phivolcs said the quake, which was tectonic in origin, occurred at 3:24 p.m.
The tremor’s epicenter was plotted 71 kilometers southwest of Santa Cruz town in Zambales, and had a depth of focus of 15 km.
Phivolcs, however, did not provide intensity data for the tremor, as it was most likely unfelt by people in the mainland.
State seismologists warned that aftershocks may occur following that quake but it noted that no damage is expected.