A recently discovered fault line caused the magnitude-6.9 quake that shook Dumaguete and its neighboring regions (Visayas region) on the afternoon of February 6, according to the Philippine Institute of Volcanology and Seismology (Phivolcs).
The earthquake was caused by the sudden shifting of two tectonic plates in the Visayas area. The shift was from a "blind fault" some 20kms below the earth between Negros and Cebu.
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