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The Philippine fault system is a major inter-related system of geological faults throughout the whole of the Philippine Archipelago, [1] primarily caused by tectonic forces compressing the Philippines into what geophysicists call the Philippine Mobile Belt. [2]
The earthquake causing this event has been predicted to be of magnitude 9.35 (stronger than the 9.1–9.3 magnitude 2004 Sumatra event). This massive earthquake, which would be the 2nd strongest in recent history, would have a total length of 990 km and a maximum wave height of 9.3 metres.
The Sibuyan Sea Fault is a part of the Philippine Fault System, a major inter-related system of geological faults throughout the whole of the Philippine Archipelago. This fault system is primarily caused by tectonic forces compressing the Philippines into what geophysicists call the Philippine Mobile Belt .
The Philippine archipelago is also cut along its length by a left-lateral strike-slip fault known as the Philippine Fault. [5] [1] Active subduction disturbs the Earth's crust, leading to volcanic activity, earthquakes, and tsunamis, making the Philippines one of the most geologically hazard-prone regions on Earth. [4] [6]
The same part of the fault zone is thought to have ruptured in the 1645 Luzon earthquake. [7] Further south the fault ruptured during the 1973 Ragay Gulf earthquake. In central Mindanao, the Cotabato fault system consists of a mixture of NW-SE trending left lateral and SW-NE trending right lateral strike-slip faults.
The North Bohol Fault or Inabanga fault is a reverse fault located at Anonang, Inabanga which was found on 15 October 2013 during the Bohol earthquake. According to the Philippine Institute of Volcanology and Seismology, a new fault occurs only once in a century. The North Bohol fault, shaped as a hanging wall and also known as the "Great Wall ...
The Marikina Valley fault system, also known as the Valley fault system (VFS), is a dominantly right-lateral strike-slip fault system in Luzon, Philippines. [2] It extends from Doña Remedios Trinidad, Bulacan in the north, running through the provinces of Rizal, the Metro Manila cities of Quezon, Marikina, Pasig, Taguig and Muntinlupa, and the provinces of Cavite and Laguna, before ending in ...
Although there are vast areas of subduction zones, some authors have considered this region to have low seismic activity, [17] though the USGS has recorded many earthquakes with magnitude ≥ 7.2 in the region as shown by the map to the side. Most recently, in 2012 the Philippine Trench experienced an earthquake of M w 7.6 (the 2012 Samar ...