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BULUSAN VOLCANO BULLETIN 01 February 2017 8:00 A.M. PDF Print
Wednesday, 01 February 2017 07:36

Bulusan Volcano’s seismic monitoring network recorded sixteen (16) volcanic earthquakes during the past 24 hours. The crater could not be observed due to thick clouds covering the summit. Sulfur dioxide (SO2) emission was measured at an average of 37 tonnes/day on January 5, 2017. Ground deformation data from continuous GPS measurements indicated a slight short-term deflation of the edifice that began in November 2016. However, the edifice remains generally inflated with respect to July 2016 based on continuous GPS data, consistent with Precise Leveling results obtained on October 2016 indicating inflationary changes since August 2016.

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are underway beneath the volcano that may lead to steam-driven or phreatic eruptions. Local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited and that vigilance in the 6-kilometer Extended Danger Zone (EDZ) on the southeastern slopes must be exercised due to the increased possibilities of sudden and hazardous phreatic eruptions. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden phreatic eruption can be hazardous to aircraft. Furthermore, people living within valleys and along river/stream channels especially on the southeast, southwest and northwest sector of the edifice should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s condition and any new development will be communicated to all concerned stakeholders.