Pilots are advised to avoid flying close to the volcano's summit as ash from phreatic
eruptions could harm aircraft.
It warned pilots to avoid flying close to the volcano's summit, as ash from any sudden phreatic
eruption can be hazardous to aircraft.
Civil aviation authorities were asked to advise pilots to avoid flying close to the volcano's summit as sudden phreatic
explosions can be hazardous to aircrafts.
'Instability will arise in either case if sufficient consideration is not paid to seepage and the position of the phreatic
surface,' he says.
explosion reportedly occurs when water beneath the ground or on the surface is heated by magma, lava, hot rocks, or new volcanic deposits.
"Oftentimes these phreatic
systems are triggered by processes going on in the magma, which are then triggering processes going on in the hydrothermal system, which then erupt," he said.
eruption are steam-driven explosions that occur when water beneath the ground or on the surface is heated by magma, lava, hot rocks, or new volcanic deposits.
Almost 17,500 people living within Mayon's six-to-seven-kilometer danger zone have been evacuated since the volcano started to spew steam and ash clouds during a phreatic
eruption - a steam-driven explosion - on Saturday.
where [h.sub.phreatic] is the waterhead within the influence radius of dewatering in phreatic
water layer; [h.sub.w] is the water level in the well; [H.sub.0] is the aquifer thickness; r is the distance between the measuring point and the center of the dewatering well; R is the influence radius of the dewatering.
** Elevation of the water table (phreatic