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Metro Manila (CNN Philippines, February 14) – The situation at the Kanlaon volcano on Negros Island remains “abnormal”, warned the Philippine Institute of Volcanology and Seismology. The agency says there has been an increase in volcanic activity in the 24 hours through Sunday morning.
In its bulletin issued Sunday morning, Phivolcs said it noticed seven volcanic earthquakes in the vicinity during its 24-hour observation period, from 5 a.m. Saturday to 5 a.m. Sunday, said Mariton Bornas, head of the division. monitoring volcanoes, in a mobile message.
The agency reminded people residing near the area, which includes parts of Negros Occidental and Negros Oriental, to be vigilant as the volcano “has entered a period of unrest.”
“Local government units and the public are strongly reminded that entry to the 4-kilometer radius permanent danger zone must be strictly prohibited due to the additional potential for sudden and dangerous water or steam eruptions,” he said.
Aviation authorities were also asked to advise pilots not to fly near the top of the volcano amid fears of a sudden phreatic eruption.
Scientific research specialist Charmaine Villamil de Phivolcs said the phreatic eruption is a steam-driven eruption, resulting from an interaction between groundwater and a hot source such as magma.
Phivolcs added that since June last year a slight inflation of the lower and middle slopes has been observed.
This “may indicate hydrothermal or magmatic processes occurring deep within the building,” he said.
Bornas explained that all active volcanoes have magma chambers several kilometers below the building, and when there is a small expansion in their size, “something pushes it up.”
She said the swelling can be caused by hydrothermal activity or pressurization due to hydrothermal steam.
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