Náttúrufræðingurinn - 1989, Síða 60

during this period, reached to the sur-
face.
5) The model predicts that the number
of dikes in a particular dike swarm in Ice-
land should be from about 400 to about
1400, depending on the lifetime and
spreading rate of the volcanic system
(dike swarm) in question. It is estimated
that the Álftafjörður dike swarm, which is
a typical swarm in Eastern Iceland, con-
tains about 1000 dikes. The long-term pre-
dictions of the model are thus in
reasonable agreement with observations.
Furthermore, provided the Reykjanes
Peninsula takes up all the spreading in the
southernmost part of Iceland, the model
predicts the number of Holocene erup-
tions on the Peninsula as 46-288, which is
not far from the observed number of 200
eruptions.
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