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Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Time evolution of the 52 long-duration events. Time evolution, from June 2012 to January 2013, of the 52 long-duration events: a energy, b dominant frequency, c centroid frequency, d permutation entropy, and e dominant polarization degree. The length of each bar represents the duration of the selected periods, whereas blue horizontal lines in a and b depict the average value throughout the entire period analyzed. Black vertical dashed lines show the beginning of weeks, while the black continuous vertical lines show the beginning of months

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