LEGAZPI CITY – The series of tremors that have been rocking Mt. Bulusan in Sorsogon and the bulging at its edifice are apparent signs that the volcano’s state of restlessness is rising.
April Dominguiano, resident volcanologist of the Philippine Institute of Volcanology and Seismology (Phivolcs) in the province, in an interview on Thursday, said volcanic quakes, and the cycle of inflation and deflation events are precursors that could lead to an eruption.
She likened Mt. Bulusan’s condition to a “pregnant woman waiting to give birth.”
Dominguiano compared the tremors and bulging exhibited lately by the volcano to the “birth pains” felt by expectant mothers.
She said close monitoring of the parameters that might trigger an eruptive event is needed at this point.
Seismic instruments and ground deformation instruments detect movements beneath the volcano’s vent and edifice that may be caused by hydrothermal and magmatic intrusion activity, she said.
These volcanic precursors could lead to a “phreatic or steam driven” eruptions, which according to Dominguiano, could happen without warning.
Historically, Mt. Bulusan had phreatic eruptions under an Alert Level 1 state of unrest.
Phivolcs monitoring network recorded 10 volcanic earthquakes during the past 24-hour observation period, bringing to 315 the total volcanic tremors recorded since July 6.
Alert Level 1 (Abnormal) status remains hoisted over the volcano.
Under this status, Dominguiano strongly advised residents to always be on alert and to keep out of the designated four-kilometer Permanent Danger Zone (PDZ) and the two-kilometer extended danger zone (EDZ) as sudden and hazardous phreatic eruptions might occur. Mar Serrano /PNA – northboundasia.com