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The ASHTAM provides information about the status of activity of a volcano by publishing a..
  • A
    three digit priority number.
  • B
    colour code.
  • C
    scale from 1 to 10.
  • D
    four letter code.

ICAO Annex 15
Appendix 3. ASHTAM Format

1.1 The ASHTAM provides information on the status of activity of a volcano when a change in its activity is, or is expected to be of operational significance. This information is provided using the volcano level of alert colour code given in 3.5 below.

3.5 Item E — Colour code for level of alert indicating volcanic activity, including any previous level of alert colour code as follows:

GREEN ALERT

— Volcano is in normal, non-eruptive state.
or, after a change from a higher alert level:
— Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state.

YELLOW ALERT

— Volcano is experiencing signs of elevated unrest above known background levels.
or, after a change from higher alert level:
— Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.

ORANGE ALERT

— Volcano is exhibiting heightened unrest with increased likelihood of eruption.
or,
— Volcanic eruption is underway with no or minor ash emission [specify ash-plume height if possible].

RED ALERT

— Eruption is forecasted to be imminent with significant emission of ash into the atmosphere likely.
or,
— Eruption is underway with significant emission of ash into the atmosphere [specify ash-plume height if possible].

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