Figure 7
Map of Tungurahua volcano showing the ashmeter network. The dry area densities correspond to the ash collected within the first two months of installation (From January 14 to March 16, 2012). The arrows indicate the direction of the volcanic plume during the three small eruptions of February 4, February 22 – 25, and March 3 – 7, 2012. The size of the arrows indicates the relative size of the ash emissions.