Jökull


Jökull - 01.12.1966, Page 61

Jökull - 01.12.1966, Page 61
 '8 8. mynd. í Kverkf jöllum. Ljósm. Hjálmar R. Bárðarson. þar 205 tm, vatnsgildi 98 cm. Önnur gryfja var grafin á þeim stað, Jtar sem mastur nr. 1 átti að vera. Þar voru 173 cm niður á jökulís, vatnsgildi 100 cm. 2.3 km neðan við mastur nr. 1 var dýpið 155 cm, vatnsgildi 95 cm, 5 km neðan við mastur 110 cm, vatnsgildi 65 cm, 7 km frá mastri 42 cm, vatnsgildi 25 crn og 9 km frá mastri um 50 cm, vatnsgildi 30 cm. Við komum á jökulrönd kl. 1 eftir miðnætti. Carl fann á niðurleið efstu mælistöngina af þrernur upp af jökuljaðrinum og mældi hana og náðu mínar gryfjumælingar niður á móts við hana, þannig að nettóákoman var mæld frá efsta mastri niður á jökulrönd. Urn nóttina kl. um 05 kom Guðmundur með sinn hóp á jökulrönd. Hafði hann fengið góða ferð og ánægjulega. Hann lagði af stað frá Grímsvatnaskála til Kverkfjalla kl. 9.40 2. júní, svo sem fyrr getur, og kom í Kverkfjöll kl. 20.00. Hafði Gusi lent að nokkru niður í sprungu vestan í Brúðarbungu og stóð í nokkru stappi að ná honum upp. Veður var fagurt í Kverkfjöllum þá um kvöldið. Frá Kverkfiöllum var haldið 2. júní kl. 20.30 og komið á Gríms- fjall um miðnætti, en haldið Jjaðan kl. 02. Víslarnir Naggur og Depill höfðu haft samflot með okkur. Laugardagurinn 4. júni var vel Jmg- inn hvíldardagur í Jökulheimum. Sunnudagur 5. júní. Fórum frá Jökulheimum kl. 10 í góðu veðri. Færið hafði mjög skánað og vorum við komin yfir Tungnaá kl. 15.40, en í bæinn nokkru fyrir miðnætti. Lauk þar með ánægjulegri Grímsvatnaferð. Sigurður Þórarinsson. SOME EVENTS IN 1965 AND 1966 JÖKULHLAUP IN SKEIDARÁ 1965 About the middle of August 1965 people in Skaftafell in the Öræfi district began to smell sulphoric gases. On Sept. I the gases began to effect metals and the water of Skeidará became dark in colour. On Sept. 3 Magnús Jóhannsson made a reconnoitring flight over Grímsvötn. Then fissures had begun to farm along the rockwalls bordering the depression in the W and S. The discharge of Skeidará had increased, but not very much. On Sept. 6 M. Jóhannsson again flew over Grímsvötn. He estimated the subsidence of the firn-ice cover in the depres- sion to be about 30 m. The discharge of Skeid- ará hacl greatly increased and the river was carrying ice-bergs. On Sept. 7 the Skeidarár- hlaup was aerialphotographed by the Icelandic Survey Department. The discharge of the river Sandgígjukvísl had then increased somewhat. On the evening of Sept. 9 the hlaup in Skeicl- ará began to diminish. THE SURTSEY ERUPTION The eruption which had begun visibly on Dec. 26, 1965, about half a nautical mile WSW of Surtsey, continued through the winter. An island was built up, and from the middle of April 1966 it grew steadely reaching a height of nearly 70 m and an area of about 30 ha. The island was named Jólnir. Eruption in Jólnir ceased on Aug. 10 and before the end of September onlv shoals were left of it. On Aug. 19 ca. 220 m long fissure opened up on Surtsey on the flow of the olcler Surtur crater which had been quiet since the end of January 1964. From this fissure thin-flowing olivine basalt lava was still flowing at the end of the year having increased the area of Surtsey Irom 235 to about 255 hectares. JÖKULHLAUP IN SKAFTÁ 1966 On the mcrning of Nov. 25 people in Skaft- árdalur observecl the first signs of jökulhlaup in Skaftá. On Nov. 27 it ceased increasing ancl when studied from a reconnoitring airplane about 2 p. m. on Nov. 28 it was clearly dimin- ishing. Its source proved to be same as the one that was discovered in 1955, WNW of Gríms- vötn. The jökulhlaup broke down the bridge on the Eldvatn river at Svínadalur. Sigurður Þórarinsson. JÖKULL 215

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Jökull

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