Geology Reference
In-Depth Information
(a)
(b)
Ballistic limit
Ballistic limit
(c)
(d)
(e)
Figure 5.20
(a-d) Stages of scoria cone development from initial phreatomag-
matic eruption (a), through phases of strombolian/phreatomagmatic intercala-
tions (b), a final strombolian cone building phase (c) and a reworked talus slopes
(d). (e) Examples of scoria cones from Afar, Ethiopia.
bedrock
(a) (b)
Figure 5.21
Schematic diagrams of eruption under ice. (a) Example with lim-
ited melt water and restricted eruption. (b) Melt water lake develops during
eruption and emergence of the volcano leads to bedded hyaloclastite deposits in
late stages.
