Jökull - 01.12.1984, Side 50

ild og is. (in Danish). H.Hagerup.
Köbenhavn. 123 pp.
Nye, J. F. 1976: Water flow in glaciers: jökul-
hlaups, tunnels and veins. J. Glaciol. 76:
181-207.
Rimstidt, J.D. and H.L. Barnes 1980: The kine-
tics of silica- water reactions. Geochim. et
Cosmochim. Acta, 44:1683-1699.
Rist, Sigurjón 1955: Skeiðarárhlaup 1954. (in Ice-
landic). Jökull 5: 30-36.
1973: Jökulhlaupaannáll 1971, 1972 og 1973.
(in Icelandic). Jökull 23: 55-60.
1974: Chemical investigations of waters from
Hvítá-Ölfus area,1973 and Thjórsa at Urriða-
foss. (in Icelandic). OSV7405, National
Energy Authority, Industrial Research
Institute. 30 pp.
1976: Grímsvatnahlaupið 1976. (in Icelandic).
Jökull 26: 80-90.
Sigurdsson, Steinthór 1984: Grímsvatnaför.
Útvarpserindi frá 1942. (An expedition to
Grímsvötn. A radio lecture, broadcast in
1942). (in Icelandic). Jökull 34:
Sigvaldason, Guðmundur E. 1965: The Gríms-
vötn thermal area. Chemical analysis of jökul-
hlaup water. Jökull 15: 125-128.
Stefánsson, Valgarður, Jens Tómasson, Einar
Gunnlaugsson, Hilmar Sigvaldason, Hjalti
Franzson and Ómar Sigurdsson 1983: Nesja-
vellir, drillhole NG-6. (in Icelandic). National
Energy Authority. OS-83023/JHD-04. lOOpp.
Steinthórsson, Sigurður and Niels Óskarsson
1983: Chemical monitoring of jökulhlaup
water in Skeidará and the geothermal system
in Grímsvötn, Iceland. Jökull 33: 73-86.
Thorarinsson, Sigurður 1939: Hoffellsjökull. Its
movement and drainage. Geogr. Ann. 21:
189-215.
1953a: The Grímsvötn-expedition June-July
1953. Jökull 3: 6- 22.
1953b: Some new aspects of the Grímsvötn
problem. J. Glaciol. 14: 267-274.
1954: Athuganir á Skeiðarárhlaupi og Gríms-
vötnum 1954. (in Icelandic). Jökull 4: 34-37.
1956: Vatnajökulsleiðangur 1956. (in Ice-
landic). Jökull 6: 38-46.
1957: Haustferð á Vatnajökul. (in Icelandic).
Jökull 7: 45-49.
1958: Vatnajökulsferðir Jöklarannsókna-
félagsins 1958. (in Icelandic). Jökull 8: 1-9.
1965: Changes of the water firn level in the
Grímsvötn caldera 1954-1965. Jökull 15:
109-119.
1974: Vötnin Stríð. Saga Skeiðarárhlaupa og
Grímsvatnagosa. (in Icelandic). Bókaútgáfa
Menningarsjóðs, Reykjavík. 254 pp.
Thorarinsson, Sigurdur and Steinthór Sigurdsson
1947: Volcano- glaciological investigations in
Iceland during the last decade. The Polar
Record. 33,34: 60-64.
Thorarinsson, Sigurður and Sigurjón Rist 1955:
Skaftárhlaup í september 1955. (in Icelandic).
Jökull 5: 37-40.
Tryggvason, Eysteinn 1960: Earthquakes, jökul-
hlaups and subglacial eruptions. Jökull 10:
18-22.
Tómasson, Haukur 1974: Grímsvatnahlaup 1972.
Mechanism and sediment discharge. Jökull
24: 27-39.
Tómasson, Haukur, Svanur Pálsson and Guð-
mundur Vigfússon 1982: Results of measure-
ments of sedimentation load. (in Icelandic),
OS82040/VOD24B. National Energy Author-
ity.
Tómasson, Jens, Hrefna Kristmannsdóttir and
Mímir Arnórsson 1977: The interaction of
sea-water with basaltic volcanic rocks on the
Reykjanes peninsula. (In: Proceedings of the
2nd international symposium on water rock
interaction. Eds. Paquet, H. and Y. Tardy).
Strassbourg 1977. Vol. I: 327-333.
Wadell, H. 1920: Vatnajökull. Some studies and
observations from the greatest glacial area in
Iceland. Geogr. Ann. 4: 300-323.
ÁGRIP
JARÐHITASVÆÐIÐ í GRÍMSVÖTNUM
Helgi Björnsson, Raunvísindastofnun
Hrefna Kristmannsdóttir, Orkustofnun.
Þótt jarðhitasvæðið í Grímsvötnum sé eitt
stærsta (ef ekki stærsta) jarðhitasvæði á íslandi,
sjást þar ekki mikil bein ummerki um jarðhita
eins og við eigum að venjast á öðrum jarðhita-
svæðum. Jarðhitasvæðið er að mestu leyti hulið
jökli. Ummerki jarðhitans eru því óvenjuleg.
Öldum saman hefur hann brætt ís og myndað
mikla lægð inni á miðjum Vatnajökli, Gríms-
vatnalægðina. Að sunnan afmarkast hún af
Grímsfjalli, 300 m háu þverhníptu stáli, að vestan
48 JÖKULL 34. ÁR