Phreatic Explosion on Bulusan Volcano

A Phreatic Explosion happened on Bulusan Volcano at 11:35 a.m. on June 10. Mount Bulusan in Sorsogon province spewed ashes 2000 meters substantial. The explosion lasted about 5 minutes.

UPDATE: On June 19 a further Phreatic Explosion occurred on Bulusan Volcano at  1:03 p.m. This explosion experienced been substantially considerably less potent. The ash plume mounted only 300 meters.

Photo courtesy of Ferjun Olayres Belarmino

Phreatic Explosion

A phreatic eruption, also known as a phreatic explosion, ultravulcanian eruption or steam-blast eruption, happens when magma heats floor or surface area drinking water. The extreme temperature of the magma any place from 500 to 1,170 °C (932 to 2,138 °F) causes in the vicinity of-instantaneous evaporation to steam, ensuing in an explosion of steam, drinking water, ash, rock, and volcanic bombs.

This kind of explosions are standard to Bulusan all through restive intervals, when its hydrothermal technique is disturbed or when steam accumulates and pressurizes at the shallow levels of the volcano. Bulusan volcano presently got nervous on February 25 this year. (Read through a lot more …)

BULUSAN VOLCANO BULLETIN 10 June 2016 12:23 P.M.

Bulusan Volcano (12.7667°N, 124.0500°E) produced a steam-driven explosion at 11:35 AM nowadays. The party lasted for roughly 5 minutes based on the seismic history and created approximately 2. kilometer-high grayish ash plume that drifted in direction of the northwest.

Warn Stage 1 (irregular) continues to be in impact in excess of Bulusan Volcano. This suggests that hydrothermal processes are underway beneath the volcano that may perhaps guide to extra steam-pushed eruptions. The local government units and the community are reminded that entry to the 4-kilometer radius Everlasting Danger Zone (PDZ) is strictly prohibited owing to the probability of sudden and harmful steam-pushed or phreatic eruptions. Civil aviation authorities ought to also advise pilots to steer clear of flying near to the volcano’s summit as ash from any unexpected phreatic eruption can be dangerous to aircraft. Additionally, individuals dwelling inside of valleys and along river/stream channels particularly on the southwest and northwest sector of the edifice should really be vigilant towards sediment-laden stream flows and lahars in the celebration of heavy and extended rainfall. DOST-PHIVOLCS is carefully monitoring Bulusan Volcano’s problem and any new development will be relayed to all involved.