c41ba6f4_Bulusan_Volcano_Alert_Signals__ALERT_LEVEL
[CRITERIA] Slight increase in volcanic earthquake and steam/gas activity. Sporadic explosions from existing or new vents. Notable increase in the temperature of hot springs. Slight inflation or swelling of the edifice. Hydrothermal, magmatic, or tectonic disturbances. The source of activity is shallow, near crater or in the vicinity of Irosin Caldera. Entry into the PDZ must be prohibited. [ALERT LEVEL] 
1 Low Level of Volcanic Unrest
Bulusan Volcano Alert Signals
ALERT LEVEL