Jökull


Jökull - 01.01.2021, Page 33

Jökull - 01.01.2021, Page 33
The 1918 Katla eruption Figure 6. The isopach map for the Mýrdalsjökull ice cap with the eruption site and estimated loca- tion of fallout and thickness of the tephra presently exposed in Kötlujökull, Sólheimajökull, Sléttjök- ull and the observation by P. Sveinsson (1930) in September 1919 of 50 cm thickness on Kötlu- jökull. The point by the eruption site is the ap- proximate location of the tephra piles shown in Figure 2. – Jafnþykktarkort af gjóskulaginu frá 1918 á Mýrdalsjökli. Kortið sýnir einnig staði þar sem gjóskan sem sem fannst í Kötlujökli og Sólheimajökli er talin hafa fallið, ásamt reiknaðri upphaflegri þykkt á sömu stöðum. Þykktin (50 cm) á miðjum Kötlujökli er samkvæmt mælingu Páls Sveinssonar í september 1919. Figure 7. a) Plot of tephra thickness for the Katla 1918 layer as a function of the square root of the area. Here the layer is imaged using four segments and integration of the segments (Fierstein and Nathenson, 1992) yields a total volume estimate of 1.0 km3. b) Comparison of Katla 1918 with the Katla tephra layers of 1262, 1625 and 1721, based on isopach maps in Larsen (2000) and Óladóttir et al. (2018). – a) Þykkt gjóskulagsins frá 1918 sem fall af kvaðratrót af flatarmáli svæðis innan hverrar jafnþykktarlínu. Hér er þykktardreifing nálguð með fjórum beinum línum og rúmmálið reiknast 1.0 km3. b) Samanburður K1918 við Kötlulögin frá 1262, 1625 og 1721. JÖKULL No. 71, 2021 31
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