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Dumaguete City, PhilippinesThursday, July 4, 2013
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PHIVOLCS tracing likely
fault line near Dumaguete

BY JUDY F. PARTLOW

Specialists of the Philippine Institute of Volcanology and Seismology are tracing a possible fault near Dumaguete City, Negros Oriental, that triggered a seismic activity in the area early this week.

Science research analyst Joe Molas of the PHIVOLCS seismic station in San Antonio, Sibulan town, Negros Oriental, said initial assessment of the 3.0 magnitude tremor that rocked Dumaguete and the towns of Sibulan and Valencia at 9:26 p.m. Monday was locally generated.

Molas said the quake was felt at Intensity III in Valencia, Intensity II in Dumaguete and Intensity I in Sibulan. An aftershock was reported but it was too weak to be plotted on the seismic equipment, he added.

PHIVOLCS reports show the earthquake was tectonic in origin and its epicenter was near Valencia, where Mt. Talinis is situated. It was measured at a depth of 03 kilometers, 09.30N, 123.15E or 14 kilometers N 83° W of Valencia.

The PHIVOLCS stations in Tagbilaran, Bohol; Lapu-Lapu City, Cebu; and Roxas City, Capiz are helping track the local origin of the earthquake, Molas said.

Former Environment Secretary Angel Alcala had previously warned of at least four intersecting geologic faults that put Dumaguete, Valencia, Sibulan, San Jose and Amlan at risk.

Majority of the earthquakes felt in Dumaguete and other parts of Negros Oriental in the past years were generated, not by a local fault, but by an oceanic trench, a linear depression of the sea floor caused by the subduction of one plate under another, such as that of the Negros Trench.*JFP

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