Over 400 weak tremors detected near Isabela, Ifugao and Mountain Province

A close up of a seismograph machine needle drawing a red line on graph paper depicting seismic and earthquake activity on isolated white background. (INQUIRER files / stock photo)

MANILA, Philippines — The Philippine Institute of Volcanology and Seismology (Phivolcs) has recorded over 400 weak earthquakes near the boundary of Isabela, Ifugao and Mountain Province since June 1.

In a brief statement on Wednesday, Phivolcs reported that an ‘earthquake swarm’ began in the area at around 10 p.m. on Sunday.

An earthquake swarm is a series of weak and consecutive tremors in one place due to the movement of an active fault.

The Phivolcs recorded 416 earthquakes during the span of four days from June 1 to 4.

Of this figure, 135 are plotted earthquakes with magnitudes of 1.2 to 3.6 and depths ranging from 2 to 38 kilometers.

The agency said it is continuously monitoring the situation in the affected areas./apl