Using infrasound to constrain ash plume rise

Table 1 Variables and values used in calculations

Gas velocity modelling
Variable	Definition	Value/units	Reference
u	Eruption velocity	(Calculated, see below)
Π	Acoustic power	(Not calculated)
ρ _air	Air density	1.4 kg m^-3
c	Speed of sound	320 m s^-1	McNutt et al. (2013)
τ	Source duration	2 s
K _d	Dipole source empirical constant	10^-2	Woulff and McGetchin (1976)
R	Volcanic vent radius	30 m	Wessels et al. (2013)
r	Source-receiver distance	12.2 km	McNutt et al. (2013)
Plume modelling
	Parameter	Value/units	Reference
	Vent longitude and latitude	60.48°, –152.74°
	Vent elevation	2400 m
	Gas mass fraction	0.03	Mastin et al. (2013)
	Source temperature	1173 K	Mastin et al. (2013)
	Solid pyroclastic density	1200 kg m^-3	Mastin et al. (2013)
	No-wind train coefficient	0.09	Woodhouse et al. (2013)
	Wind entrainment coefficient	0.9	Woodhouse et al. (2013)
	Calculated peak eruption velocities	Event 2: 315 m s^-1
		Event 17: 251 m s^-1

ISSN: 2191-5040