Jökull - 01.06.2000, Page 49

Geirfinnur Jónsson and Leó Kristjánsson
64° 64°
19°20°
19°
30’
40’
50’
20’
30’
40’
50’
30’30’
30’30’
Tindfjallajökull
Eyjafjallajökull
Mýrdalsjökull
Torfajökull
Vík − village
El
dg
já
0 5 10 15 20 25 km
Figure 1. Index map of the Mýrdalsjökull glacier and the surrounding region. Glaciers are labelled. Thin lines
are 200, 500 and 1000 m contours. The thick dotted line marks the topographic caldera within Mýrdalsjökull
(Finnur Pálsson, personal communication, 1996) whereas the thinner dotted line denotes the inferred thermal
caldera. The volcanic fissure Eldgjá is also shown. – Yfirlitskort af umhverfi Mýrdalsjökuls. Sýndar eru 200,
500 og 1000 m hæðarlínur. Rimi Kötluöskjunnar er sýndur með grófri punktalínu, en fínni punktalína er dregin
utan um mörk þess svæðis sem sýnir óvenjulega segulhegðun, sennilega vegna hás hita.
ing of the field on 1:100,000 maps. These maps were
later redrafted to scale 1:250,000 and published (Sig-
urgeirsson, 1980).
We digitized Sigurgeirsson’s original data from
the 1:100,000 maps and included them in a composite
magnetic map of Iceland (Kristjánsson et al., 1989).
This map represents the best available estimate of the
residual field caused by crustal sources. As detailed
information on flight altitudes was not preserved, no
effort has been made to transform the magnetic sur-
vey to a common altitude, and no filtering other than
10 second averaging has been applied.
48 JÖKULL No. 49