NEARLY 50 tremors in what the Philippine Institute of Volcanology and Seismology (Phivolcs) described as an earthquake swarm have been recorded in a town in Camarines Sur since Saturday, August 19.
Phivolcs director Teresito 'Toto' Bacolcol said it is possible that the earthquake swarm could be a signal that a big one is coming.The strongest tremor recorded was magnitude 4.4 on Aug 19.Phivolcs said an earthquake swarm is a short-lived sequence of minor to light earthquakes, showing no identifiable large event or main shock.Bacolol explained that an earthquake swarm may vary in duration and outcome.
With at least seven significant earthquakes with magnitudes ranging from 6.0 to 7.4 that occurred in the Camarines Sur town and its vicinity from 1811 to the present, the most damaging, was the magnitude 7.0 on March 17, 1973, Bacolcol said.Citing data, he said Camarines Sur is a seismically active region because of the presence of active faults that include the Legaspi Lineament and offshore segments of the Philippine Fault in Ragay Gulf.
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