Figure 4From: An analysis of the issuance of volcanic alert levels during volcanic crisesProportion of VALs issues at Open and Closed Volcanoes. Percentages of data set that are classified as Categories 1 – 5 following the color code for Figure 2. Pie Charts show UwE (Category 6, black) as a % of all alerts except `Missed.’ Data have been separated by volcano type.Back to article page