Manila, Oct. 7 -- The Philippine Institute of Volcanology and Seismology (Phivolcs) said Tuesday that a one-meter coastal uplift was observed in Barangay Nailon, Bogo City.

The uplift was a result of the movement of the newly discovered Bogo Bay Fault, which triggered the magnitude 6.9 offshore quake in Cebu on Sept. 30.

In a social media post, Phivolcs said the approximately one-meter measurement was based on the exposed tidal flats, raised tidal notches, and higher high-tide markers.

According to Phivolcs, coastal uplift is the "vertical deformation of the coast in response to the upward and downward movement of the crust along a fault or subduction zone."

It said coastal uplift or subsidence may happen abruptly during "an earthquak...