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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 strike-slip component of the convergence is accommodated partly by the Philippine fault system and partly by the Cotabato Fault System, a network of mainly NW-SE trending sinistral (left-lateral) strike-slip faults that form the boundary between the Cotabato Arc and the Central Mindanao Volcanic Belt. [3]
The Philippine Institute of Volcanology and Seismology (PHIVOLCS) initially reported a magnitude 6.5 earthquake striking at 8:03 am Philippine Standard Time (PST) in Cataingan, Masbate. [9] The report was later revised to a magnitude 6.6 earthquake. The earthquake was also felt in several parts of Luzon and the Visayas. [6]
The Philippine archipelago is bounded by subduction zones which makes the region volcanically active. The most active volcano in the Philippines is the Mayon Volcano located in southeastern Luzon. [36] It is related to the subduction of Philippine Sea plate beneath the Philippine Mobile Belt. [4] Earthquakes (mag >6.0) in the Philippines (2019)
The magnitude 6.7 quake was located 26 kilometers (16 miles) from Burias at the southern tip of the Philippines, the U.S. Geological Survey said. It was centered at a depth of 78 kilometers (48 ...
MANILA (Reuters) -Evacuations were under way in the Philippines after a quake of at least magnitude 7.5 struck the southern region of Mindanao on Saturday night, triggering tsunami warnings in the ...
The focal mechanism indicates strike-slip faulting with either sinistral movement on a NW-SE trending fault or dextral movement on a SW-NE trending fault, but the distribution of the aftershocks are consistent with the sinistral fault plane. [2] The earthquake may be the result of movement on the Tangbulan Fault, according to PHIVOLCS. [7] [8] [9]
The longest and most seismically active of the strike-slip structures is the 1200 km long Philippine Fault Zone. [6] It carries the left lateral component of the oblique convergence at the Philippine Trench, with a current estimated slip-rate of 35 ± 4 mm per year on Leyte, reducing northwards to about 20 mm per year on Luzon. On Luzon, the ...