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.
Following a massive phreatic eruption
of an almost (http://www.
The National Disaster Risk Reduction and Management Council (NDRRMC) through its regional council in Bicol has already provided more than P20-million worth of assistance through the distribution of relief goods in areas affected by Mayon Volcano's phreatic eruption
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.
5 kilometers, in a phreatic eruption
that lasted an hour and 47 minutes starting 4:21 p.
On April 13th, a small phreatic eruption
dispersed sediments from the crater's lake around the area inside the main active caldera.
However, on Saturday the mountain sent smoke up into the air for the second time in a week in what volcanologists call a phreatic eruption
-- caused by the heating and expansion of groundwater.
A magmatic-hydrothermal eruption meanwhile differs from an ordinary phreatic eruption
in that it is caused by extrusion of hydrothermal fluids (vapor and liquid) from a hydrothermal reservoir, without the need for substantial energy or mass input from magma.
Sometimes this was low in energy and in number of events but it was related with a posterior phreatic eruption
The eruption of steam and ash, as opposed to lava, is called a phreatic eruption
Civil aviation authorities were asked to advise pilots to avoid flying close to the volcano's summit as ejecta from any sudden phreatic eruption
can be hazardous to aircraft.
The Philippine Institute of Volcanology and Seismology (Phivolcs) recorded another phreatic eruption
on Sunday morning at Mayon Volcano, Albay.