A 6-tier volcano alert level system is in use in the Philippines, New Zealand and other Asian countries.
Level of Unrest
Eruption
Magma
Situation
Alert Level
none, quiet
not in foreseeable future
no evidence
no alert
0
low level
not imminent
uncertain
abnormal
1
moderate
possible
Rising
increasing unrest
2
relatively high
probable
close to crater
increasing tendency towards eruption
3
intense
could occur in days
very close to crater
hazardous eruption imminent
4
extreme
in progress
being ejected
hazardous eruption
5
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Specialty: Emergency Medicine, Critical Care
