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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
  1. The numbers under each event name in parentheses are the number of trajectories which could be extracted for each event