Bogo city: The Philippine Institute of Volcanology and Seismology (Phivolcs) reported that a one-meter coastal uplift has been observed in Barangay Nailon, Bogo City. This phenomenon resulted from the movement of the newly discovered Bogo Bay Fault, which triggered a magnitude 6.9 offshore earthquake in Cebu on September 30.

According to Philippines News Agency, Phivolcs indicated in a social media post that the approximately one-meter uplift was measured based on exposed tidal flats, raised tidal notches, and higher high-tide markers. Coastal uplift is described as the vertical deformation of the coast due to the movement of the crust along a fault or subduction zone.

Phivolcs explained that coastal uplift or subsidence can occur abruptly during an earthquake, known as coseismic, or gradually during the slow progressive deformation of the crust, referred to as interseismic. The public has been advised to prepare for potential strong aftershocks and to avoid structures that are prone to damage or might collapse.

As of 11 a.m. Tuesday, Phivolcs has recorded 8,298 aftershocks ranging from magnitude 1 to 5.1, with at least 34 being felt and 1,556 being plotted or located. Phivolcs urged the public to obtain information only from the Phivolcs website and social media platforms, as well as from authorized agencies.