(Eagle News) — The Philippine Institute of Volcanology and Seismology has raised the alert level 1 for Mt. Pinatubo. In making the move, PHIVOLCS noted the “persistence of seismic activity.” For instance, since January 20, 2021, it said the Pinatubo Volcano Network (PVN) has detected 1,722 “imperceptible earthquakes” beneath the Pinatubo edifice. It said the first cluster on Jan. 20-26 occurred along the Sacobia Lineament at depths of 15-28 kilometers and ranged between ML1.0 and […]