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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] Some notable Philippine faults include the Guinayangan, Masbate and Leyte faults.
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 ...
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 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 Sibuyan Sea Fault is located ...
On Luzon, the fault zone splays out into a number of different faults, including the Digdig Fault. One of the largest historical earthquake on the fault zone was the 1990 Luzon M s 7.8 event that left nearly 2,000 people dead or missing. The same part of the fault zone is thought to have ruptured in the 1645 Luzon earthquake. [7]
The earthquake ruptured approximately 100 km of the Philippine Fault System along the Surigao segment. The Surigao segment strikes in a slightly north-northeast orientation. Left-lateral stream offsets, and 1-meter-high scarps are evident that the fault is active. By studying the surface rupture length, a moment magnitude of 7.4 was estimated. [4]
Notably, on July 24, 2021, the fault was responsible for the Calatagan earthquake, which registered a magnitude of 6.6. The region's tectonic dynamics, marked by the lateral motion along this fault, contribute to the occurrence of significant seismic events such as the mentioned earthquake.
The Bohol fault system is a reverse fault system in Bohol province, Philippines. This fault system contains three segments: the newly found North Bohol Fault following the 2013 Bohol earthquake, [2] the South Offshore Fault, [3] and the East Bohol Fault. The North Bohol Fault is located in Inabanga and near Clarin.