An “earthquake swarm” continued to hit Batangas yesterday as the Philippine Institute of Volcanology and Seismology (Phivolcs) advised people to stay calm but remain vigilant for the “Big One.” Phivolcs director Renato Solidum said an earthquake swarm has been going on since Tuesday last week, and seismologists have recorded over 1,000 aftershocks, including Saturday’s four “moderately sized” tremors.

He said there was nothing to be alarmed about, as this was expected of a gradually moving fault line. Solidum said an earthquake swarm typically lasts for days or weeks. At 11:14 a.m. yesterday, a magnitude-3.9 aftershock struck five kilometers southwest of Mabini, Batangas. It was reportedly felt at Intensity 4 in Tingloy, Batangas; Intensity 3 in Puerto Galera, Oriental Mindoro; and Intensity 2 in San Teodoro, Oriental Mindoro. MORE