Following the elevated status, the agency called for vigilance in the extended danger zone, which stretches to two kilometers downslope of the permanent danger zone, for possible sudden and hazardous phreatic
eruptions, as well as landslides and rockfalls.
"Vigilance in the extended danger zone on the southern slopes of Bulusan, stretching two kilometers further downslope of the PDZ, must be observed due to the possibilities of sudden and hazardous phreatic
eruptions, rockfall and landslide," Phivolcs said.
Bulusan stretching two kilometers further downslope of the permanent danger zone due to possibilities of sudden and hazardous phreatic
eruptions, rockfall, and landslide.
'The key to the stability of these structures lies in the proper control of the seepage and in particular the "phreatic
surface", which is the upper limit of water flowing through the dam,' explains Durve.
Three diagenetic environments that are marine phreatic
, meteoritic phreatic
and burial environments have been interpreted on the basis of observed diagenetic features.
eruption is at Alert Level 2, but it's still under the volcano and we think we have to go under the bench," Phivolcs officer-in-charge Renato Solidum reportedly said.
Researchers are particularly interested in the observations of Kilauea's steam-powered "phreatic
" eruptions, which occur when hot rock interacts with water in the ground.
The disaster agency described Merapi's latest eruption as phreatic
, which means magma heats up ground water and vapor is released under pressure.
The volcano, popular among tourists, was closed to visitors due to the phreatic
eruptions -- steam-driven explosions caused by groundwater heating or expanding.
On January 14, Phivolcs raised the volcano eruption alert level to 3 after Mayon spewed ash (phreatic
eruption) on January 13.
Authorities have ordered mandatory evacuation last Saturday after phreatic
eruptions were recorded on the Mayon volcano.
Two similar "phreatic
" eruptions occurred at the volcano in central Albay province on Sunday, unleashing more ash.