Philippines raises alert level at active volcano after eruption sends ash 4.5km into sky
Mount Bulusan , an active volcano in central Philippines, erupted early on Monday, sending ash 4.5 km into the sky. The eruption was phreatic, or steam-driven, lasting 24 minutes from 4.36am local time, the Philippine Institute of Volcanology and Seismology (Phivolcs) confirmed. It produced a plume that reached 4.5km in height, triggering ashfall in Cogon and Bolos in Irosin, as well as in Puting Sapa, Guruyan, Buraburan, and Tulatula Sur in Juban, according to Rappler. Phivolcs raised its alert level from 0 to 1, indicating low-level volcanic unrest and the risk of phreatic eruptions. Scientists say that a phreatic eruption occurs when water beneath the earth’s surface comes into contact with hot magma or rocks, causing it to rapidly turn into steam and explode. These eruptions are steam-driven, ejecting ash, gas, and debris, but do not involve new magma. In the lead-up to the eruption on Monday, which took place between 4.36am and 5.00am, Phivolcs had detected 53 volcanic earthq...