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Table 1 A comparison between values produced by AshCalc and previously published values for three eruptions of varying magnitude

From: AshCalc–a new tool for the comparison of the exponential, power-law and Weibull models of tephra deposition

Eruption Source Exponential (single segment) eruption volume (km3) Exponential (two segments) eruption volume (km3) Power law eruption volume (km3) Weibull eruption volumea(km3)
Chaitén 2008–Whole deposit (isopachs closed) Watt et al. 2009 - 0.17 - -
AshCalc - 0.1713 0.2158b 0.2033
Chaitén 2008–Whole deposit (mapped area) Watt et al. 2009 - 0.15 - -
AshCalc - 0.1518 0.1548b 0.1566
Chaitén 2008–3rd of May lobe Watt et al. 2009 - 0.05 - -
AshCalc - 0.0478 0.0506b 0.0535
Chaitén 2008–6th of May lobe Watt et al. 2009 - 0.03 0.04b -
AshCalc - 0.0347 0.0420b 0.0361
Rungwe pumice eruption–Malawi (1 cm) Fontijn et al. 2011 2.2g 3.2 3.3c -
AshCalc 2.145 3.236 3.251c -
Rungwe pumice eruption–Malawi (3 cm) Fontijn et al. 2011 - - 5.8d -
AshCalc - 4.301 5.818d -
Rungwe pumice eruption–Malawi (5 cm) Fontijn et al. 2011 - 5.6 8.5e -
AshCalc - 5.559 8.493e -
Minoan eruption ,1990 - 38.5 - -
  AshCalc - 38.83 39.01f 42.34
  1. aDue to the stochastic nature of the fit the values are taken from the medial volume of five successive calculations by AshCalc.
  2. bProximal limit of integration–5.0 km, distal limit of integration–250 km.
  3. cProximal limit of integration–8.6 km, distal limit of integration–1000 km.
  4. dProximal limit of integration–7.0 km, distal limit of integration–1000 km.
  5. eProximal limit of integration–6.1 km, distal limit of integration–1000 km.
  6. fProximal limit of integration–1.0 km, distal limit of integration–600 km.
  7. gMistake in published value, acknowledged by K. Fontijn in personal communication. Value should be 2.1 km3.