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It was first recorded as magnitude 6.3 by the Philippine Institute of Volcanology and Seismology, which later downgraded it to M w 6.1 at a shallow depth of 10 km. There was a foreshock which preceded the main quake, recorded M w 4.8 at 7:28 AM PST by Philippine Institute of Volcanology and Seismology with a PHIVOLCS Earthquake Intensity Scale ...
The earthquake struck near Davao Oriental early on Thursday morning, August 12. PHIVOLCS earlier listed the earthquake as magnitude 7.3 at a depth of 69 kilometers, then revised its advisory to a magnitude 7.2 earthquake, which occurred at a depth of 50 kilometers. It later reverted to its original report of a magnitude 7.3 earthquake.
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]
The focal mechanism and depth corresponded to an earthquake of reverse-faulting at an intermediate depth. On the PHIVOLCS Earthquake Intensity Scale (PEIS), intensity VII (Destructive) was instrumentally recorded in Glan, Sarangani. Intensity VI was reported in General Santos as well as in Polomolok and Koronadal, South Cotabato.
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. The Abra River Fault is a northern extension of the Philippine Fault Zone.
Video taken from the installed IP camera of PHIVOLCS monitoring Taal Volcano. The volcano erupted on the afternoon of January 12, 2020, 43 years after its previous eruption in 1977. [6] According to PHIVOLCS director Dr. Renato Solidum, seismic swarms began at 11 am and were later followed by a phreatic eruption from Volcano Island Main Crater ...
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.
Aftershocks and potential damage are to be expected from such a powerful tremor, says Philippine agency