Figure 10From: An analysis of the issuance of volcanic alert levels during volcanic crisesChange in VAL issuance in episodes that ended with eruption and those of `UwE’ over time. Percentages of VALs issued are normalized by the number of volcanoes included in the study year to year. Percentages of data are classified as Categories 1 – 5 following the color code of Figure 2. Blue line is the % of `UwE’ and the Black line is the 3 year running average of the `Timely’ and `Almost’ categories.Back to article page