Jökull - 01.12.1964, Blaðsíða 26

Fig. 10. Sídujökull May
25, 1964. Aerial view to-
wards W. The inner dash
line marks the extension
o£ the glacier after the
1945-advance. The outer
dash line marks the max.
advance in Historical
Time.
Photo: S. Thorarinsson.
between the two extreme types. In the area
SW of Pálsfjall, where the ice surface seemed
to have been lowered some tens of meters
(fig. 5), there were many irregular domes
heavily crevassed in a criss-cross fashion, pre-
sumably reflecting the subglacial topography.
As we do not know how much Sídujökull
had receded since it was aerially photographed
in 1944 we cannot tell exactly how much it
advanced, but roughly estimated the maximum
advance was of the same order as 1934, about
500 m.
This advance of Sídujökull is the only one
which we — thanks to aerial reconnoitring —
have been able to follow from its very begin-
ning. This reconnoitring revealed the interesting
fact that crevassing in the intake area started
nearly a year and a half before the front began
to advance.
Fig.ll. Sídujökull. Aerial
view towards E May 25,
1964. Grænafjall is in the
background to the right.
Photo: S. Thorarinsson.
84
JOKULL 1964