PHIVOLCS Raises Alert Level 1 over Pinatubo Volcano

In the 7:00 AM bulletin of the Philippine Institute of Volcanology and Seismology (PHIVOLCS) today, March 4, 2021 (Thursday), due to the persistence of seismic activity the alert status of Pinatubo Volcano was raised from Alert Level 0 (Normal) to Alert Level 1 (Low-level Unrest).

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Pinatubo at Alert Level 1

According to PHIVOLCS,  Pinatubo at Alert Level 1 means that there is low-level unrest that may be related to tectonic processes beneath the volcano and that no imminent eruption is foreseen.

Furthermore,  entry into the Pinatubo Crater area must be conducted with extreme caution and should be avoided if possible.

And, communities and local government units surrounding Pinatubo are reminded to be always prepared for both earthquake and volcanic hazards and to review, prepare and strengthen their contingency, emergency, and other disaster preparedness plans.

Earthquakes Detected at Pinatubo

According to the bulletin, 1,722 imperceptible earthquakes beneath the Pinatubo edifice were detected by the Pinatubo Volcano Network (PVN) since January 20, 2021.

“The first cluster of earthquakes on 20-26 January 2021 occurred along the Sacobia Lineament at depths of 15-28 kilometers and ranged between ML1.0 and ML2.5 in magnitudes. This has been succeeded by a more persistent cluster of earthquakes occurring along a north-northwest-south-southeast-trending structure 10 to 35 kilometers beneath the center of the edifice itself, with a few shallower earthquakes occurring on both ends of the cluster,” PHIVOLCS added.

Furthermore, the earthquakes ranged between ML0.5 and ML2.8 in magnitude, and all earthquakes recorded are associated with rock-fracturing processes.

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