Jökull

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Jökull - 01.12.1984, Qupperneq 50

Jökull - 01.12.1984, Qupperneq 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
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