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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Long-duration seismicity and their relation to Copahue volcano unrest

Fig. 2

Time evolution of reduced parameters for the NB episode occurred at 23:40:00 UTC on 21 July 2019. a Energy in the range 0.5–10 Hz. b Spectral peaks with energy above 95% of the maximum, i.e., samples. c Averaged polarization degree (PD) of each sample in the range ±0.05 Hz when PD\(\geqslant 0.8\) and \(\sigma _{PD}\leqslant 0.1\). d Averaged rectilinearity (R) of each sample in the range ±0.05 Hz when \(\sigma _R\leqslant 0.1\). e Averaged horizontal azimuth (\(\Theta _H\)) and f vertical incidence (\(\Theta _V\)) of each sample when \(R\geqslant 0.7\) and \(\sigma _H,\sigma _V\leqslant 5^{\circ }\). Due to the large number of samples, only the third part of the information is depicted in b and c. The size of each circle is proportional to its spectral energy, given in b

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