The Philippine Institute of Volcanology and Seismology is closely monitoring the Negros trench following five earthquakes, the strongest one at 5.2-magnitude, that hit Negros Occidental yesterday, Ishmael Narag, PHIVOLCS Seismology Division officer-in-charge, said.
The 24-hour watch began when the last tremor hit at 10:10 a.m. yesterday, Narag told the DAILY STAR.
The epicenter of the earthquakes were offshore and they are believed to have been caused by sudden movements along the earthquake generating Negros trench, he said.
“We believe a subductions occurred where heavier denser plates dove into the interior of the earth, triggering the five earthquakes recorded in Cauayan town and Bago City in Negros Occidental,” Narag said.
“We are closely monitoring the Negros Trench to make sure the situation does not escalate, although he noted that the magnitude of later quakes yesterday had gone down,” he added.
The first quake was recorded at 12:24 a.m., with a magnitude of 3.6 in Bago City; followed by four others that hit Cauayan at 5.2-magnitude at 12:43 a.m., 4.8-magnitude quake at 1:40 a.m., a 2.8-magnitude at 5:40 a.m. and 3.5-magnitude at 10:10 a.m., PHIVOLCS reported.
Cauayan Mayor John Rey Tabujara said they felt earthquakes shake their town one after the other but they did not cause any damage, nor was anybody harmed.
“These are small magnitude events that did not lead to any damage…. but we are not discounting the possibility of having stronger earthquakes,” Phivolcs Director Renato Solidum also told Manila reporters.*CPG