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Quake jolts Siargao Is.

A 4.0 magnitude earthquake jolted Siargao Island in Surigao del Norte province at dawn on Friday, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.

The Philippine Institute of Volcanology and Seismology (Phivolcs) on Tuesday lowered the alert status over Mayon Volcano from 4 to 3, having observed “decreased tendency towards hazardous eruption.”

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Mayon rumbles

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Mayon Volcano spewed incandescent lava fountains and ash plumes as it continues to exhibit increased activity in the past 24 hours.

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Sulfur dioxide emission tends to increase through time as magma degasses with increasing rates as it moves up from great depths beneath the volcano, the Philippine Institute of Volcanology and Seismology said.

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Environment and Natural Resources Secretary Roy Cimatu appealed to quarry companies operating within the six-kilometer permanent danger zone surrounding Mayon Volcano to stop risking the health and lives of their workers.

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The Philippine Institute of Volcanology and Seismology (Phivolcs) is considering lowering the alert level of Mayon volcano from 4 to 3 in the next few weeks if the volcano’s lower level of activity will continue.

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