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Figure 4 | Earth, Planets and Space

Figure 4

From: Reconstruction of the geometry of volcanic vents by trajectory tracking of fast ejecta - the case of the Eyjafjallajökull 2010 eruption (Iceland)

Figure 4

Histogram of ejection angles ε from 2,479 individual particles (the x-axis indicates the maximum angle of a bin, e.g., the ‘62°’ bar stands for the counts of trajectories with 58° < ε < 62°). This angle is defined counterclockwise towards the vertical. Due to the wind conditions during 8 to 10 May 2010 at Eyjafjallajökull, the ash plume partly covered the first quadrant (i.e., ε < 0) as well as the second until approximately 22°, indicated by a grey-shaded background (see also inlet in the right top corner). For the CAM model, only the cut-off angle is of importance and only the second quadrant values are used - yielding an angle of approximately 62°, implying a value for α of 38° (see Figure 2 for definition of angles).

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