Officials cautioned people near Shinmoedake about the possibility of deadly pyroclastic
People living near these danger areas were advised to observe precautions associated with rockfalls, pyroclastic
density currents and ashfall.
It also called for caution against falling volcanic rocks and pyroclastic
flows in areas within about 2 km of the crater.
density currents or PDCs have deposited to the 4.
As of January 30, 2018, about 119 volcanic earthquakes, 68 rockfall events, nine tremor events, two lava fountaining, and two episodes of thick pyroclastic
density current (PDC) generation from lava collapse have been recorded and released by PHIVOLCS.
With Alert Level 4 in place, public have been strongly advised to not enter the eight-kilometre danger zone and to be vigilant against pyroclastic
currents, lahars and sediment-laden stream flows.
Lava flows in two gullies had advanced down the volcano's slopes more than half a mile and pyroclastic
flows - superheated gas and volcanic debris - had spread three miles from the crater in one area, the Philippine Institute of Volcanology and Seismology said.
flows, superheated gas and volcanic debris, had reached 5
On its Facebook page, PHIVLOCS shared videos of lava fountaining and pyroclastic
flow from the volcano Monday night, saying the lava reached 500 to 700 meters above the crater rim, and produced an ash plume that was 4 kilometers high.
Authorities warned a violent eruption may occur in hours or days, characterized by more rumblings and pyroclastic
flows - superheated gas and volcanic debris that race down the slopes at high speeds, vaporizing everything in their path.
Amateur videos taken on Monday night showed thicker pyroclastic
flows, or lava trails, coming from the crater of the active volcano and video from the state volcanalogy institute on Tuesday (January 16) showed thick ash following lava trails flowing down the foot of Mayon.
Li and Milliken find that the most obvious water-bearing exposures occur in broad pyroclastic
deposits (involving gas-driven eruptions)--and the biggest, containing up to 500 ppm water, covers the northern half of the Aristarchus Plateau.