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The PHIVOLCS earthquake intensity scale (PEIS; Filipino: Panukat ng Pagyanig ng Lindol) [1] is a seismic scale used and developed by the Philippine Institute of Volcanology and Seismology (PHIVOLCS) to measure the intensity of earthquakes. It was developed as upon a specific response to the 1990 Luzon earthquake. PHIVOLCS cites seismic scale ...
PHIVOLCS Observatory at Mount Hibok-Hibok.. The Philippine Institute of Volcanology and Seismology (PHIVOLCS, Filipino:; Filipino: Surian ng Pilipinas sa Bulkanolohiya at Sismolohiya [2]) is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes, and tsunamis, as well as other specialized information and services primarily for the ...
The 1975 M w 7.6 earthquake was caused by intra-slab normal faulting, while the 2012 M7.6 was a result of thrust faulting within the descending slab. [ 3 ] The relatively young Cotabato Trench subduction zone has been associated with several large megathrust earthquakes, including the 1918 Celebes Sea earthquake (M8.3), the 1976 Moro Gulf ...
The focal mechanism and depth corresponded to an earthquake of reverse-faulting at an intermediate depth. [5] On the PHIVOLCS earthquake intensity scale (PEIS), intensity VII (Destructive) was instrumentally recorded in Glan, Sarangani. [2] Intensity VI was reported in General Santos as well as in Polomolok and Koronadal, South Cotabato. [2]
The 1973 Ragay Gulf earthquake occurred at around 16:30 local time . It measured 7.4 M w and had a maximum intensity of IX ( Violent ) on the Modified Mercalli intensity scale . The Philippine Institute of Volcanology and Seismology assigned a maximum intensity of VIII ( Very Destructive ) on the PHIVOLCS earthquake intensity scale .
However, PHIVOLCS said that it was a separate earthquake. [10] On August 2, 2024, two M ww 6.8 and 6.3 earthquakes occurred within the area of the 2023 sequence. [11] [12] The December 2 earthquake was described as the first major earthquake in the area since a doublet 7.1 and 7.5 earthquake that also produced a tsunami in 1992. [13]
PHIVOLCS initially suspected the earthquake may have occurred on the Abra River Fault. Geologists had been aware of the potential for large earthquakes on the fault. The last known earthquake on the fault was in 1868, measuring 4.0–5.0 in magnitude. [11] The Abra River Fault is a northern extension of the Philippine Fault Zone.
The earthquake lasted for a minute and was produced by the Makilala-Malungon Fault which PHIVOLCS stated that could possibly produce a Magnitude 7.2 earthquake, with a possible Intensity VIII. [citation needed] Eight minutes after the mainshock a M w 3.5 aftershock followed which felt III.