Mayon Volcano is showing serious signs of unrest again. State volcanologists have raised Alert Level 3 after dangerous pyroclastic density currents—locally called “uson”—were recorded in Albay. The ...
GMA Network on MSN
Explainer: Meaning of PHIVOLCS alert levels per active volcano
The PHIVOLCS Volcano Alert Level Scheme is a guide to understanding the state of an active volcano, the current threat it ...
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