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Jökull - 01.12.1961, Qupperneq 34

Jökull - 01.12.1961, Qupperneq 34
(c) The low-temperature activity. There are approximately 250 low-temperature thermal areas scattered over the lowlands of the western half of the country. The number of major springs is about 600 and the total inte- grated flow of all hot-water springs is rougly 1.500 liters per second. The total sensible (above 4° C) Iieat output of the springs amounts to some 108 cal/sec, giving an average temperature of 75° C. The low-temperature areas are in a great number of cases distributed in a linear pattern. This suggests a common structural control and interrelation between the individual thermal areas on the lines. In accordance with the dis- cussion below, the individual lines will be re- TABLE II Major low-temperature thermal lines in Iceland. Total natural Max. surface Heat flow temp. output liters/sec. C. magnitude (a) 52 100 I (b) 140 100 I (0 60 100 I (d) 70 100 I (e) 120 83 I (0 10 88 I (g) 400 100 II (h) 70 89 1 (i) 145 100 I Remarks on drilling, base temperature, etc. Includes the Great Geysir, borderline case. Borderline case. Base temp. at Reykir 98° C, 70 wells at Reykir, max depth 1,380 meters. Output of wells 370 Iiters/sec. at 87° C. Base temp. in Reykjavik 146° C, max. depth 2,200 meters. Output of wells 134 liters/sec at a max. temp. 138° C. System of lines. Includes largest hot water spring at Deildartunga. Borderline case. TABLEIII Hi^h-temperature thermal areas in Iceland. Eleva- Heat tion Area output Name m km2 magnitude I. Reykjanes . . . . 15 1 1 2. Trölladyngja . . 120 5 I 3. Krysuvik 150 10 I 4. Hengill . . 30-600 50 II 5. Kerlingafjöll . . 900 5 II 6. Torfajökull . . . 900 100 III 7. Vonarskard . . . . . 1,000 I 8. Grímsvötn .... . . 1,000 12 III 9. Kverkfjöll .... . . 1,500 10 II 10. Askja . . 1,050 I 11. Námafjall 350 2.5 II 12. Krafla 450 0.5 I 13. Theistareykir . 330 2.5 I Remarks on drilling, base temperature etc. One well 162 m deep. 15 wells, max. depth 1,200 m. Base temp. appr. 230° C. Base temp. ca. 230° C. Numerous shallow wells, 8 deep wells max. depth 1,200 m. Under the Vatnajökull ice sheet. A few shallow wells. 32
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