PIVSPhilippine Institute for Volcanology and Seismology
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This type of volcanic mudflow is called a lahar, referred to in the PIVS warning.
PIVS also shared some photographs of the pyroclastic flow from Monday morning on its Facebook page.
com/business/193681-mayon-volcano-flight-cancellations-delays) flight operations were affected Monday, given the volcano activity and the PIVS bulletin, which said: "Civil aviation authorities must also advise pilots to avoid flying close to the volcano's summit as ash from any sudden eruption can be hazardous to aircraft.