SORSOGON CITY: After a week of being silent, Mount Bulusan spewed ashes on Sunday afternoon, Ed Laguerta, Philippine Institute of Volcanology and Seismology (Phivolcs) resident volcanologist chief in Bicol told The Manila Times.
The explosion took place at around 1:03 in the afternoon. Laguerta said Bulusan Volcano’s explosion was steam-driven and created a 300-meter ash column above the crater.
“The explosion is a bit weak, not so energetic and lack of pressure. The steam-driven explosion is just 300 meters above the crater,” he said.
Last week, the volcano exploded at 11:35 a.m., sending an ash column about 2,000 meters high
The event lasted for about five minutes based on the seismic record, drifting towards the northwest portion of the volcano. The Phivolcs official said the recent explosion is phreatic in nature.
Bulusan Volcano, some 70 kilometers southeast of Mayon volcano and about 250 kilometers southeast of Manila, suddenly ejected grayish, cauliflower-like steam ash after a week. Bulusan’s last magmatic eruption took place more than 40 years ago.
Bulusan Volcano is one of the active volcanoes in the country. It has an elevation of 1,547 meters above sea level, and is said to have been formed almost 40,000 years ago.
Bulusan Volcano’s seismic monitoring network did not record any volcanic earthquake during the past 24 hours when the explosion took place.
Steaming activity could not be observed because of rain clouds covering the summit. Precise leveling survey results from April 27 to May 5, 2016 indicated slight deflationary changes of the edifice relative to February 2016.
Alert Level 1 remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are underway beneath the volcano that may lead to more steam-driven eruptions.
RHAYDZ B. BARCIA