Jökull - 01.12.1972, Síða 35

Fig. 4. Aerial infrared image (2357
IMT) of northern part of Kverkfjöll
massif, 22 August 1966. a) Linear array
of Hveradalur thermal features (limits
shown by bracket) and possible northern
extension of tectonic lineament (dashecl
line); ai) surface drainage of thermal
waters from Hveradalur; b) Kverkfjöll
outlet tongue; c) thermal meltwater
stream emerging frorn subglacial tunnel
at glacier portal (bright tone of image
indiates higher water temperature near
point of emergence from outlet glacier
and lower temperature downstream; ar-
row indicates flow clirection); d) east-
and west-facing bedrock escarpments
forming a couloir which constricts flow
of Kverkjökull outlet tongue; e) points
of thermal emission around periphery of
ice cauldron-subsidence structure; f)
semiconcentric pattern indicating convec-
tion of warm air along crevasses formed
by ice cauldron subsidence; g) Holocene
volcanic rocks; h) Dyngjujökull lobe; i)
thermal emission from steam vents, hot
springs, and solfataras of Kverkfjöll
eystri. Inset on left shows Hveradalur
thermal area (a) in somewhat greater de-
tail; comjrare with figure 7a—lr. From
Friedman et al., 1969, Figure 11.
Mynd 4. Innrauð mynd af norðurhlula
Kverkfjalla, tekin 22. ágúst 1966. a)
Jarðhitalínan i Hveradal og hugsanlegt
framhald hennar; ai) frárennsli hvera i
Hveradal; b) sporður Kverkjökuls; c) frá-
rennsli undan jöklinum (Ijósari litur sýn-
ir hœrri hita nœr jöklinum en f]rsr); d)
hamrar Kverkfjallakverkarinnar; e) og f)
hitaútgeislun frá hringlaga og hálfhring-
laga sprungum skringum sigdœldir i jökl-
inum; g) ungt berg; h) Dyngjujökull; i)
hitageislun frá jarðhita i Kverkfjöllum
eystri. Litla myndin til vinstri sýnir jarð-
hitasvœði Hveradalsins nokkru skýrar en
aðalmyndin.
JÖKULL 22. ÁR 33