unit of measure
conversions equivalences

In New Zealand a 5 level alert system exists for volcanic eruptions.
The alert levels range from 0 to 5, where 0 is low level and 5 is the most hazardous level. 
In New Zealand Volcanoes are broken into two groups:

Frequently Active Volcanoes such as Mt Ruapehu and White Island. 
Reawakening of Dormant Volcanoes such as Mayor Island, Tarawera or Taupo. 

 

Scientific Alert Level	Indicative Phenomena	Volcano Status
0	Typical background surface activity; seismicity, deformation and heat flow at low levels.	Usual dormant, or quiescent state.
1	Departure from typical background surface activity.	Signs of volcano unrest.
2	Onset of eruptive activity, accompanied by changes to monitored indicators.	Minor eruptive activity.
3	Increased vigour of ongoing activity and monitored indicators. Significant effects on volcano, possible effects beyond.	Significant local eruption in progress.
4	Significant change to ongoing activity and monitored indicators. Effects beyond volcano.	Hazardous local eruption in progress.
5	Hazardous large volcanic eruption in progress.	Large hazardous eruption in progress.

 

Scientific Alert Level	Indicative Phenomena	Volcano Status
0	Typical background surface activity; seismicity, deformation and heat flow at low levels.	Usual dormant, or quiescent state.
1	Apparent seismic, geodetic, thermal or other unrest indicators.	Initial signs of possible volcano unrest. No eruption threat.
2	Increase in number or intensity of unrest indicators (seismicity, deformation, heat flow etc).	Confirmation of volcano unrest. Eruption threat.
3	Minor steam eruptions. High-increasing trends of unrest indicators, significant effects on volcano, possibly beyond.	Minor eruptions commenced. Real possibility of hazardous eruptions.
4	Eruption of new magma. Sustained high levels of unrest indicators, significant effects beyond volcano.	Hazardous local eruption in progress. Large scale eruption now possible.
5	Destruction with major damage beyond active volcano. Significant risk over wider areas	Large hazardous volcanic eruption in progress.