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The Philippine Institute of Volcanology and Seismology ( PHIVOLCS, Tagalog: [ˈfivolks]; Tagalog: 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 ...
On January 28, the main crater emitted 800 meters of steam according to an 8 am bulletin by PHIVOLCS. It was described as a "below instrumental detection", while Alert Level 3 remained raised. On August 18, PHIVOLCS reported a 20-meter steam emission from the volcano's main crater and several volcanic earthquakes within its vicinity.
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.
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.
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.
The United States Geological Survey reported the earthquake had a magnitude of 7.6 and a maximum Modified Mercalli intensity of VII (Very strong). The Philippine Institute of Volcanology and Seismology (PHIVOLCS) said it had a magnitude of 7.4 and that it measured VII (Destructive) on the PHIVOLCS Earthquake Intensity Scale in Tandag.
Earthquake. 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. The report was later revised to a magnitude 6.6 earthquake. The earthquake was also felt in several parts of Luzon and the Visayas.