Etna, flank eruption 2001
9 May-13 July 2001: trachybasalt
at summit
(South East Crater)
17 July-9 August 2001: flank-eruption:
alkali-rich basalt (primitive):
3.4 wt% H2O; 0.11-0.41 wt% CO2.
A laboratory volcano (13): application to Etna
(Italy)
Perfect gas law
Gas volume at depth of reservoir
+ intermittency between
episodes (3-5 days)
Gas flux at depth of reservoir
Bubble diameter: 0.7 mm
Origin of flank eruptions is not
well-known
but in July 2001 associated with
new fresh magma
FTIR measurements: gas composition with high CO2/S
and S/Cl
violent emptying of a foam layer accumulated at 1.5-2 km depth