ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

Finse (60 035'N,
7°30'E, 1,350 m a.s.l.), southern Norway.
The solifluction lobe is about 50 m long, 20 m wide and
has a frontal riser of about 2 m. The lobe is situated in
front of a semiperennial snowbank. Threaded bolts were
drilled into stones along the central flow line of the solifluction
lobe. Ball joint markers were inserted into the
bolts and aligned vertical with the aid of a circle bubble.
The positions of these markers were repeatedly surveyed
with theodolite/Electronic Distance Meter from two concrete
pillars on bedrock. Standard position errors are close
to one millimeter.
The measured displacement along the central flow line varied
by an order of magnitude. The displacement was largest
(about 10 ern/year) in a sector immidiately downslope
of the snowbank. In this sector, the solifluction lobe is slightly
concave in cross section. Further down towards the
lobe front, the displacement was lower. Here, the lobe has
a convex cross section. Sorted and nonsorted stripes are
directed in towards the central flowline in the upper part
of the lobe and to some extent outwards on the lower part
of the slope. This reflects the flow pattern.
The surface strain along the central flow line resembles
that of a glacier, and the glaciological concepts of extending
flow (du/dx>O, u = velocity, x is distance in flow direction)
and compressive flow (du/dx