Fig. 3: Different electrical signals recorded during the 2021 Tajogaite eruption.
From: Explosive eruption style modulates volcanic electrification signals
Voltage (V) measured by the primary (black line) and secondary (orange line) antennas of the BTD with the corresponding covariance (V2) between the primary and secondary signals shown below (purple line). Note the different scales on the y-axis for each panel. a Individual high-amplitude electrical discharges; b Minutes-long bursts of quasi-continuous low-amplitude electrical activity; c Seconds-long bursts of quasi-continuous low-amplitude electrical activity; d Faint electrical discharges that generally remain unidentified by the detection algorithm; e Movement of charge, indicated by the slow-varying electrostatic signal. f Ash falling on top of the sensor, evidenced by the negative covariance. A single electrical discharge was detected at 10:27:56.6 UTC, indicated by the corresponding positive covariance.
