Environmental Engineering Reference
In-Depth Information
Figure 6.2 H
2
O
H
2
S) gas compositions for several volca-
noes. Direct sampling data (white circles) are from Symonds
et al
.(
1994
) and
Fischer (
2008
), expect for the Soufrière Hills volcano at Montserrat (Hammouya
et al
.,
1998
). Multi-GAS data (grey circles) are from the UniPa
-
CO
2
-
S
t
(i.e. SO
2
þ
INGV database,
except for Villarica (Shinohara and Witter,
2005
); each symbol represents the
mean H
2
O
-
H
2
S) gas composition, obtained by averaging Multi-
GAS records over measurement periods from hours up to several years (in the
case of Etna and Stromboli). A black and white version of this
-
CO
2
-
(SO
2
þ
figure will appear
in some formats.
For the colour version, please refer to the plate section
.
