Fig. 9
From: Long-duration seismicity and their relation to Copahue volcano unrest
Polarization analysis of 226 BB tremor episodes. We excluded 44 episodes due to gaps or/and corrupted data in some of the three components. a The 25th, 50th (black line), and 75th percentiles of R when PD\(\geqslant 0.8\). b The sample size of R in function of the frequency and polarization class: linear (\(N_L\)), elliptical (\(N_E\)), and circular (\(N_C\)). c The polarization coefficients \(C_P\) and \(C_L\) in function of the frequency. d The 25th, 50th (black line), and 75th percentiles of horizontal azimuth \(\Theta _H\) and (e) vertical incidence \(\Theta _V\) in function of \(C_L\) when the sample size is greater than 10\(^3\)