Table 1 Characteristic parameters of each event obtained from binary images (*1) and trajectory analysis (*2)
From: Transport of ballistic projectiles during the 2015 Aso Strombolian eruptions
Parameter | Event 1 (4) | Event 2 (10) | Event 3 (23) | Event 4 (6) | Event 5 (39) |
|---|---|---|---|---|---|
Mean particle size in a frame (m)*1 | 0.19 | 0.19 | 0.22 | 0.26 | 0.25 |
Approximate particle number in a frame*1 | 1.2 | 11.7 | 61.1 | 16.7 | 176.9 |
Maximum of all trajectory heights (m)*2 | 7.7 | 25.6 | 57.7 | 15.7 | 44.0 |
Mean ± standard deviation of ejection velocity (m)*2 | 6.0 ± 1.0 | 10.9 ± 2.4 | 18.8 ± 5.3 | 9.6 ± 0.7 | 15.5 ± 3.9 |
Mean ± standard deviation of ejection angle from vertical axis (°)*2 | 4.6 ± 2.9 | 7.1 ± 4.7 | 6.4 ± 4.2 | 10.8 ± 6.9 | 11.1 ± 6.6 |
Maximum travel distance (m) | 8.9 | 11.9 | 17.8 | 13.8 | 17.8 |