Jökull - 01.01.2015, Page 5

Structure and tectonic position of the Eyjafjallajökull volcano, S-Iceland
Figure 3. Active structures at Eyjafjallajökull and neighbouring volcanoes, Katla, and Tindfjallajökull. The
base map is a digital elevation model from the National Land Survey of Iceland. Eruption sites within the Katla
caldera are shown with respective year (e.g. Björnsson et al., 2000; Gudmundsson et al., 2007). Structural
features are based on the geological maps of Jóhannesson et al. (1990), Jónsson (1998), Torfason and Jónsson
(2005), and the paper of Jakobsson (1979). – Sprungukort af Eyjafjallajökli og nálægum eldstöðvum, Kötlu og
Tindfjallajökli, byggt á stafrænum gögnum frá Landmælingum Íslands. Gosstöðvar innan Kötluöskjunnar eru
merktar með viðkomandi gosári (Björnsson et al., 2000; Gudmundsson et al., 2007). Kortið er byggt á eldri
jarðfræðikortum (Jóhannesson et al., 1990; Jónsson, 1998; Torfason and Jónsson, 2005; Jakobsson, 1979).
We have compiled a structural map of the Eyja-
fjallajökull volcanic system and surrounding areas
from available publications, aerial photographs and
satellite images (Figure 3). Topography and geo-
graphic information is from the IS50 data base of the
National Land Survey of Iceland. We rely heavily on
the geological maps of Jóhannesson et al. (1990) and
Jónsson (1998), also the geological mapping of the
east flank area by Torfason and Jónsson (2005) and
the paper of Jakobsson (1979) on the petrology of the
EVZ and the South Iceland flank zone. Faults and
eruptive fissures on those maps were checked against
low altitude aerial photographs from Loftmyndir ehf
and satellite images and then mapped into a GIS data
base. Small corrections were made when obvious
discrepancies turned up. The outlines of the vol-
canic systems are those of Einarsson and Saemunds-
son (1987). The subglacial caldera of Katla is redrawn
from Björnsson et al. (2000).
The fissure system that emerges from the map of
Figure 3 has a clear E-W trend and extends from the
JÖKULL No. 65, 2015 5