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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: On data reduction methods for volcanic tremor characterization: the 2012 eruption of Copahue volcano, Southern Andes

Fig. 4

Comparison of the 52 long-duration events. Comparison of the 52 long-duration events. Permutation entropy versus energy (a) and centroid frequency (b), and dominant polarization degree versus energy (c) and centroid frequency (d). The blue dashed line in a and b depicts the background level of the permutation entropy. For detailed information of each event see Additional file 6

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