Phivolcs shows the low-frequency earthquakes (left) and volcano-tectonic earthquakes (right), indicated as dots, recorded from 3 pm of July 2 to 12 pm of July 3, 2024. The triangles are stations ...

Two earthquakes struck Calayan, Cagayan early Monday, according to the Philippine Institute of Volcanology and Seismology (PHIVOLCS). The first one occurred at 12:54 a.m. and had a magnitude of 5.5.