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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

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

Fig. 2

Time evolution of reduced parameters during December 2012. Time evolution of reduced parameters during December: a spectrogram, b energy, c dominant frequency, d centroid frequency, e permutation entropy, f polarogram, and g dominant polarization degree. The black rectangle centered on December 24 encloses the eruptive stage. The red horizontal dashed lines represent the entire average value of parameters. Different colors are related to different types of events, whereas the codes at the top of shaded bands identify events listed in Additional file 6

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