Preceded by a series of underground tremors, the most recent paroxysm of Etna took place on Saturday, 26 October 2013.
15 November 2020
26 October 2013
by Zanita Avotniece (EUMETSAT)
The plumes of Etna’s eruption moved south-westwards, producing a sulphur dioxide (SO2) cloud with periodic mixture of volcanic ash.
According to the BBC , the plume of ash rising from Mount Etna could be seen across much of eastern Sicily.
The nearest airport and airspace were forced to close temporarily, but the eruption did not require any mountain villages to be evacuated. Etna’s eruptions are frequent, but the last major one occurred in 1992.
The evolution of the paroxysm is shown in the sequences of Ash and Airmass RGB images (Figures 1 and 2). In Ash RGB images green colours represent the extent of the SO2 cloud, the pinkish colours show the ash plume, but the hotspot from the lava is a dark violet colour. However, in the Airmass RGB the SO2 cloud appears in more reddish colours, with the volcanic ash in light yellow.
The volcanic cloud could also be seen in the IR10.8 image, 24-h Microphysics RGB, the Natural Colours RGB and Convection RGB.
The plume of volcanic ash/SO2 was optically thick, and reached a great height. According to the retrieved cloud physical properties (Credit: KNMI, see Figure 3), the maximum height of the ash cloud at 07:00 UTC was 8690 metres, with a temperature of 241.1 °K or -32.05 °C. However, the 12:00 UTC sounding from Trapani weather station in Sicily suggested that the height of the plume could be around 8 km.
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