A series of earthquakes strike Calamba, Laguna and Batangas province late Thursday evening, February 5, 2015, PHIVOLCS said in its updates.
A 2.9-magnitude earthquake struck northwest of Calamba, Laguna, and the shaking was followed by a series of smaller temblors.
The first quake struck 3 kilometers northwest of Calamba at about 9:43 p.m., the Philippines Institute of Volcanology and Seismology said. It was centered at a depth of 17 kilometers. About two smaller quakes followed within 30 minutes. One struck 2 kilometers southwest of Laguna while the other one hit 2 kilometers southeast of Mataas Na Kahoy, Batangas with 1.7-magnitude.
Intensity II was felt in San Pablo and Los Baños, Laguna with the first earthquake. Intensity II means “slightly felt”. Further PHIVOLCS stated that Intensity is “felt by few individuals at rest indoors with still Water in containers oscillated noticeably.”
Laguna is part of Marikina Valley Fault System — a dominantly dextral strike-slip fault system which extends from Dingalan, Aurora in the north and runs through the cities of Quezon, Marikina, Pasig, Makati, Parañaque, Taguig and the provinces of Laguna and Cavite.
The two minor earthquakes in Laguna were the first earthquakes to hit this year. In 2014, no single earthquake that struck Laguna province was recorded.