Jökull - 01.12.1974, Page 12

Fig. 8. A map of the western part of Vatnajökull summarizing data available at present. Seismic
soundings (Holtzsclierer, 1954; Sigurdsson, 1970 (J. P. Martin’s survey in 1955), gravity survey
(Páhnason, 1964; Sigurdsson, 1970; Tliorbergsson, 1974) and geodetic survey (Rist, 1961 (Thor-
bergsson’s map of Grímsvötn)); Thorbergsson, 1974; Hallgrímsson and Björnsson, 1974).
Mynd 8. Kort af vesturhluta Vatnajökuls, sem sýnir gögn um þyngdarmœlingar, skjálftamœl-
ingar og landmcelingar.
Eythorsson’s (1952) map. The good correspond-
ence between the seismic and the gravity sur
veys in the region just to the east of Grímsvötii
has enabled the determination of the regional
Bouguer anomaly 8b (—15 mgal), and use of
the data in Fig. 9 has revealed an important
1 0 JÖKULL 24. ÁR