BULUSAN VOLCANO BULLETIN 01 October 2016 8:00 A.M. PDF Print

Bulusan Volcano’s seismic monitoring network recorded six (6) volcanic earthquakes during the past 24 hours. Voluminous emission of white to grayish plume from mid-slope, southeast vents was observed at around 06:50 AM to 12:40 PM. It rose up to 200 meters then crept downslope and drifted towards southeast. Light ash fell in barangays of San Rafael, San Roque and San Jose, municipality of Bulusan. Weak rumbling sound was heard at Brgy. San Roque and sulfurous smell was observed at Brgy. San Roque and Brgy San Rafael. Sulfur dioxide (SO2) emission was measured at an average of 33 tonnes/day on September 22, 2016. Precise leveling data obtained on August 16-25, 2016 indicated slight inflationary changes of the edifice relative to May 2016. Moreover, ground deformation data from continuous GPS measurements as of 03 September 2016 showed inflationary trends since July 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 more steam-driven eruptions. The local government units and the public are reminded that entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden and hazardous steam-driven or 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 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 relayed to all concerned.