Náttúrufræðingurinn - 1981, Blaðsíða 216

Árnason, Bragi. 1976. Groundwater systems in
Iceland. Rit 42, Soc. Sci. Islandica.
Björnsson, Axel. 1976. Jarðhræringar við
Kröflu. Náttúrufræðingurinn. 46: 177 —
198.
Bjömsson, Axel, Kristján Sœmundsson, Páll Ein-
arsson, Eysteinn Tryggvason & Karl Grönvold.
1977. Current rifting episode in North
Iceland. Nature. 266: 318—323.
Björnsson, Axel, Gunnar Johnsen, Sven Sigurðsson,
Gunnar Þorbergsson & Eysteinn Tryggvason.
1979. Rifting of the Plate Boundary in
North Iceland 1975—1978. J. of
Geophys. Research. 84: 3029—3038.
Einarsson, Páll. 1978. S-wave shadows in the
Krafla caldera in NE-Iceland, evidence
for a magma chamber in the crust. Bull.
Volcanol. 41: 1 —9.
Gíslason, Gestur, Halldór Ármannsson & Trausti
Hauksson. 1978. Krafla. Hitaástand og
gastegundir í jarðhitakerfinu. Skýrsla
Orkustofnunar OSJHD/7846.
Guðmundsson, Guðmundur, Guðmundur Pálmason,
Karl Grönvold, Karl Ragnars, Kristján
Sœmundsson & Stefán Arnórsson. 1971.
Námafjall — Krafla. Áfangaskýrsla um
rannsóknir jarðhitasvæðanna. Skýrsla
Orkustofnunar.
Karlsdóttir, Ragna, Gunnar Johnsen, Axel
Bjömsson, Ómar Sigurðsson & Egill Hauks-
son. 1978. Jarðhitasvæðið við Kröflu.
Áfangaskýrsla um jarðeðlisfræðilegar
rannsóknir 1976—1978. Skýrsla Orku-
stofnunar OSJHD/7847.
Pálmason, Guðmundur, Slefán Arnórsson, Ingvar
Birgir Friðleifsson, Hrefna Krislmannsdóllir,
Kristján Sæmundsson, Valgarður Slefánsson,
Benedikt Steingrímsson, Jens Tómasson & Leó
Kristjánsson. 1979. The Iceland crust:
Evidence from drillhole data on struc-
ture and processes. I: Deep Drilling
Results in the Atlantic Ocean, Ocean
Crust (ed. M. Talwani, C. G. Harrison
and D. E. Hayes). Maurice Ewing Series
p. 43—65. Am. Geophys. Union.
Sigurðsson, Ómar. 1978. Rennsliseiginleikar
efra jarðhitakerfisins í Kröflu. Skýrsla
Orkustofnunar OSJHD 7851.
Sigurðsson, Ómar & Valgarður Stefánsson. 1977.
Lekt í borholum í Kröflu. Skýrsla Orku-
stofnunar OSJHD 7727.
Stefánsson, Valgarður. 1981. The Krafla
Geothermal field, Northeast Iceland I:
Geothermal Systems — Principles and
case histories, ed. L. Rybach and P.
Muffler. John Wiley and Sons.
Steingrímsson, Benedikt & Gestur Gíslason. 1978.
Krafla. Aflmælingar á borholum.
Skýrsla Orkustofnunar OSJHD 7804.
Sœmundsson, Kristján, Stefán Arnórsson, Karl
Ragnars, Hrefna Kristmannsdótlir & Gestur
Gíslason. 1975. Krafla. Skýrsla um niður-
stöður rannsóknarborana 1974. Skýrsla
Orkustofnunar OSJHD 7506.
Tulinius, Helga. 1980. Time-Domain Elec-
tromagnetic Survey in Krafla, Iceland.
Colorado Sch. of Mines, MS-thesis T-
2325, 73 s.
Þórarinsson, Freyr. 1980. Krafla — Viðnáms-
mælingar með fjórpólaaðferð sumarið
1979. Skýrsla Orkustofnunar OS
80013/JHD 07.
SUMMARY
Investigation on the Krafla
high-temperature geothermal
field
by Valgarður Slefánsson,
Orkustofnun, Grensásvegur 9, 108 Reykjavík, Ice-
land.
A comprehensive description of the
geothermal investigation of the Krafla
high-temperature geothermal field during
the last decade is given in the paper. Almost
all methods commonly used in geothermal
exploration have been used in the inves-
tigation of this geothermal field.
Volcanic activity, associated with a rifting
episode at the plate boundary in Northeast
Iceland, began at an early stage of ex-
ploitation. This magmatic activity has now
continued for five years. As the volcanic
activity has influenced the chemical con-
ditions in the geothermal reservoir, the
358