Jökull - 01.01.2015, Blaðsíða 71

The Eldgjá lava flow on Mýrdalssandur
844 km2 og heildar rúmmál 20 km3. Þetta undirstrik-
ar stærð og mikilvægi Eldgjárgossins í jarðfræðisögu
Íslands.
REFERENCES
GEM systems 2010. GSM-19-T v7.0 Instruction manual.
Court Markham, ON Canada.
Geophysical Institute, Univ. Alaska Fairbanks, Sept. 2014.
Aurora Forecast www.gi.alaska.edu/AuroraForecast.
Gudmundsson, M.T. and J. Milsom 1997. Gravity and
magnetic studies of the subglacial Grímsvötn volcano,
Iceland: Implications for crustal and thermal structure.
J. Geophys. Res. 102, 7691–7704.
Gudmundsson, M.T., G. Larsen, Á. Höskuldsson and Á.G.
Gylfason 2008. Volcanic hazards in Iceland. Jökull 58,
251–268.
Halldorsson, S.A., N. Oskarsson, K. Gronvold, G. Sigurds-
son, G. Sverrisdottir and S. Steinthorsson 2008. Iso-
topic heterogeneity of the Thjorsa lava–implications
for mantle sources and crustal processes within the
Eastern Rift Zone, Iceland. Chem. Geol. 255, 305–
316. doi:10.1016/j.chemgeo.2008.06.050.
Hammer, C.U. 1984. Traces of Icelandic eruptions in the
Greenland ice sheet. Jökull 34, 51–65.
Hinze, W.J., R.R.B. von Frese and A.H. Saad 2013. Grav-
ity and Magnetic Exploration. Principles, Practices
and Applications. Cambridge Univ. Press. Cambridge,
UK., 525 pp.
Hjartarson, Á. 1988. Þjórsárhraunið mikla – stærsta nú-
tímahraun jarðar. Náttúrufræðingurinn 58, 1–16.
Jakobsson, S.P. 1979. Petrology of Recent basalts of the
Eastern Volcanic Zone, Iceland. Acta Naturalia Isl. 26,
1–103.
Jóhannesson, H., S.P. Jakobsson and K. Sæmundsson
1990. Geological map of Iceland, sheet 6, South-
Iceland, third edition. Icelandic Museum of Natural
History and Geodetic Survey, Reykjavík.
Jónsson, J. 1982. Notes on the Katla volcanogenic debris
flow. Jökull 32, 61–68.
Kristjánsson, L. and G. Jónsson 2007. Paleomagnetism
and magnetic surveys in Iceland. J. Geodyn. 43, 30–
54.
Larsen, G. 1979. Um aldur Eldgjárhrauna. Náttúrufræð-
ingurinn 49, 1–26.
Larsen, G. 2000. Holocene eruptions within the Katla vol-
canic system, south Iceland: Characteristics and envi-
ronmental impact. Jökull 49, 1–28.
Larsen, G. 2010. Katla: Tephrochronology and eruption
history. Developm. Quat. Sci. 13, 23–49.
Larsen, G. and S. Ásbjörnsson 1995. Volume of the tephra
and rock debris deposited by the 1918 jökulhlaups on
western Mýrdalssandur, South Iceland. Abstract, Int.
Glaciol. Soc., Reykjavík.
Leirvogur Magnetic Observatory. September 2014.
http://www.raunvis.hi.is/∼halo/leirvogur.html.
Miller, J. 1989. The 10th century eruption of Eldgjá, south-
ern Iceland. Nordic Volcanol. Inst. Rep. 8903, 30 pp.
Nummedal, D., A.C. Hine and J.C. Boothroyd 1987.
Holocene evolution of the south-central coast of Ice-
land. In: Glaciated Coasts, Fitzgerald, D.M. and P.S.
Rosen (eds.), Academic Press, London, 115–150.
Óladóttir, B.A., O. Sigmarsson, G. Larsen and Th. Thord-
arson 2008. Katla volcano, Iceland: magma composi-
tion, dynamics and eruption frequency as recorded by
Holocene tephra layers. Bull. Volcanol. 70, 475–493.
Peters, L.J. 1949. The direct approach to magnetic inter-
pretation and its practical application. Geophysics 14,
290–320.
Sigurðardóttir, S.S. 2014. The Eldgjá lava flow beneath
Mýrdalssandur, S-Iceland. Mapping with magnetic
measurements. MSc. thesis, University of Iceland,
Reykjavík. https://notendur.hi.is//∼mtg/nemritg/SSS-
MS_2014.pdf.
Thorarinsson, S. 1955. Myndir úr jarðsögu Íslands III. Eld-
gjá. Náttúrufræðingurinn 25, 148–153.
Thorarinsson, S. 1975. Katla og annáll Kötlugosa. Árbók
Ferðafélags Íslands 1975, 125–149.
Thorarinsson, F. and H. Guðmundsson 1979. Mýrdals-
sandur. A geophysical survey. Nat. Energy Auth., re-
port OS79022/JKD06.
Thordarson, T., D.J. Miller, G. Larsen, S. Self and H. Sig-
urdsson 2001. New estimates of sulfur degassing and
atmospheric mass-loading by the 934 AD Eldgjá erup-
tion, Iceland. J. Volcanol. Geotherm. Res. 108, 33–54.
Tómasson, H. 1996. The jökulhlaup from Katla in 1918.
Ann. Glaciol. 22, 249–254.
United States Geological Survey 2013. Earth explorer.
http://www.earthexplorer.usgs.gov.
Vegagerðin 2013. Grjótnám á Mýrdalssandi fyrir rofvarnir
við Múlakvísl árið 2013. Stapi Jarðfræðistofa.
Zielinski, G.A., M.S. Germani, G. Larsen, M.G.L Baillie,
S. Whitlow, M.S. Twicker and K. Taylor 1995. Evi-
dence of the Eldgjá (Iceland) eruption in the GISP2
Greenland ice core: relationship to eruption processes
and climatic conditions in the tenth century. The
Holocene 5, 129–140.
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