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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]
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 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 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.
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 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.
Increased activity was recorded by PHIVOLCS in September, starting with a series of volcano-tectonic earthquakes on September 9. [13] On September 10, Kanlaon produced its highest volume of sulfur dioxide emissions since 2009, at 9,985 tonnes, prompting PHIVOLCS to raise concern over its possible first magmatic eruption since 1902. [14]
List of earthquakes in the Philippines Topics referred to by the same term This disambiguation page lists articles associated with the title 2023 Mindanao earthquake .