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Jökull - 01.12.1984, Qupperneq 61

Jökull - 01.12.1984, Qupperneq 61
Fig. 4. The photo shows a branch of the Lakagígar 1783 A. D. and Eldgjá 934 A. D. lavas, south of Eldmessu- tangi. The Lakagígar lava stopped here (foreground), while the Eldgjá lava pro- ceeded further (seen grassgrown and with pseudocraters). Mynd 4. Myndin sýnir Skaftárelda- hraunið frá 1783 og Eldgjárhraunið frá 934 sunnan Eld- messutanga. In 1983 it will be 200 years since the Lakagígar eruption took place and one may speculate if such an event is likely to happen in the near future! There is at least one similar event on Iceland, which can be identified in the Greenland Ice Sheet — the Eldgjá eruption around 934 A.D., so it is not a very frequent phenomenon. The Eldgjá eruption took place close to the region of the Lakagígar eruption and I remember my own fascination, when a few years ago I saw these two lava streams; the one on top of the other, both visible at certain places, where the Lakagígar lava had stopped its advance, while the Eldgjá íava had run further. The lavas are today moss- or grassgrown and one can almost tell the difference in eruption dates by the character of their green “blankets”. The Eldgjá eruption In Fig. 4 outliers of the Lakagígar and Eldgjá lavas are seen; the photo shows a location south of Eldmessutangi, where part of the Lakagígar lava flow stopped; at this branch the older Eldgjá flow did proceed further. A characteristic feature in the not overrun Eldgjá lava is its almost “Etruscan tomb-like”, pseudocraters (seen as grass-grown mounds on the photo). Recent evidence, (Larsen 1979), indicates, that the Eldgjá eruption took place after Landnam, but not later than 950 (Thorarinsson personal communication, 1977). The finding of the Eldgjá signal in the Green- land Ice Sheet originated in a kind of “ping- -pong” letters between me and Thorarinsson, where some misunderstandings, preliminary results and new findings resulted in the final dating of the Eldgjá eruption to 934 ± 2 years by means of the Créte acidity record. It is an episode in my working with ice cores, which I remember with great affection. There are several interesting features about the Eldgjá fallout on the ice sheet, which differ from the Lakagígar event. First of all the Eldgjá acid deposition took place over 3 years, Fig 5, and shows a maximum fallout in the winter of 934— 935. The Créte record is the most ideal of the existing records; also with respect to dating. It is not unusual, that stratospheric fallout is high in the winter time, this was e.g. the case for the Tambora fallout (Hammer et al. 1980), but in the case of Eldgjá it points to a rather violent and JÖKULL 34. ÁR 59
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