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Table 2 Classification of pulses

From: Mass eruption rates in pulsating eruptions estimated from video analysis of the gas thrust-buoyancy transition—a case study of the 2010 eruption of Eyjafjallajökull, Iceland

Pulse type d (m) No. of pulses Average t pulse (s)
Type 1 (strong) >50 56 37.5
Type 2 („weaker“) <50 446 4.7
  1. Strong (type 1) eruptive pulses that feature ash columns with a large diameter at the vent exit d are much less frequent than weaker (type 2) pulses