Jökull - 01.12.1964, Page 24

Fig. 8. Sketch map showing the area affected by the advance o£ Sídujökull 1963/64. Based on
aerial photos.
reconnoitring flight Jan. 12, 1964. Then a net-
work of wide crevasses had spread at least 4
km towards SW from Pálsfjall. The lower part
of the glacier was covered by fog, but judging
frorn the crevassing SW o£ Pálsfjall as compar-
ed with the condition there Sept. 27 the pre-
vious auturnn, the writer regards it as certain
that the crevassing had now spread to the
glacier margin.
April 23, 1964, H. Gíslason, G. Gudmunds-
son and Th. Sigurdsson, together with some
other members of the Glaciological Society,
82
drove in jeeps to the margin of Sídujökull just
W of the river Djúpá where it turns SSE.
They found a very steep ancl high front, nearly
vertical in places (figs. 6 and 7), but its ad-
vance seemed to have come nearly to a halt. In
front of the glacier they built four cairns — the
distance between the eastern- and westernmost
ones being about 5 km — and measured the
distance from them to the glacier margin. These
measurements tliey repeated Sept. 24, 1964.
Then the ice-margin at the westermost cairn
had advanced 30 m, whereas at the other cairns
JÖKULL 1964