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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.
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 of IV (Moderately Strong). [2] The foreshock lasted 10–15 seconds which made people feel dizzy and nauseated.
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]
Increased activity was recorded by PHIVOLCS in September, starting with a series of volcano-tectonic earthquakes on September 9. [24] 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. [ 25 ]
Landslides. Yes. Casualties. 11 dead, 730 injured. At 16:14 PST (08:14 UTC) on November 17, 2023, the province of Sarangani on the island of Mindanao in the Philippines was struck by an earthquake measuring 6.7 Mww. It had a maximum perceived intensity of VIII (Severe) on the Modified Mercalli Intensity Scale. At least eleven people were killed ...
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.
Largest. Mw 8.3 1918 Celebes Sea earthquake. Deadliest. M w 8.0 1976 Moro Gulf earthquake 5,000–8,000 killed. The Philippines lies within the zone of complex interaction between several tectonic plates, involving multiple subduction zones and one large zone of strike-slip, all of which are associated with major earthquakes.
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.