Jökull - 01.01.2019, Side 82

Variation in b-value of caldera earthquakes of Bárðarbunga Volcano
ing up to eruptions in NW-Vatnajökull. Jökull 64, 61–
82.
Björnsson, H. 1988. Hydrology of Ice Caps in Volcanic
Regions. Soc. Sci. Isl. 45, Reykjavík, 139 pp.
Björnsson, H. and P. Einarsson 1990. Volcanoes be-
neath Vatnajökull, Iceland: Evidence from radio-echo
sounding, earthquakes and jökulhlaups. Jökull 40,
147–168.
Einarsson, P. 1986. Seismicity along the eastern margin of
the North American Plate. In: Vogt, P.R. and B.E. Tu-
cholke (eds.), The Geology of North America, Vol. M,
The Western North Atlantic Region. Geological Soci-
ety of America, 99–116.
Einarsson, P. 1991a. Earthquakes and present-day tecton-
ism in Iceland. Tectonophysics 189, 261–279.
Einarsson, P. 1991b. Umbrotin við Kröflu 1975-1989 (The
activity of Krafla 1975–1989, in Icelandic). In: Einars-
son, Á., and A. Garðarsson (eds.). Náttúra Mývatns.
Hið Íslenska Náttúrufræðifélag, 97–139.
Einarsson, P. 2008. Plate boundaries, rifts and transforms
in Iceland. Jökull 58, 35–58.
Einarsson, P. 2018. Short-term seismic precursors to Ice-
landic eruptions 1973–2014. Frontiers in Earth Sci-
ence 6:45. https://doi.org/10.3389/feart.2018.00045
Einarsson, P. and S. Björnsson 1987. Seismological
measurements at the Science Institute, University
of Iceland. In: Sigfússon, Þ.I. (ed.). Í hlutarins
eðli, Festschrift for Þorbjörn Sigurgeirsson. Men-
ningarsjóður, Reykjavík, 251–278.
Einarsson, P. and K. Sæmundsson 1987. Earthquake
epicentres 1982–1985 and volcanic systems in Ice-
land: A map in: Sigfússon, Þ.I. (ed.). Í hlutarins
eðli, Festschrift for Þorbjörn Sigurgeirsson. Men-
ningarsjóður, Reykjavík.
Einarsson, P., B. Brandsdóttir, M.T. Guðmundsson, H.
Björnsson, K. Grönvold and F. Sigmundsson 1997.
Center of the Iceland hotspot experiences volcanic un-
rest. Eos Transactions 78, no. 35, 369, 374–375.
El-Isa, Z.H. and D.W. Eaton 2014. Spatiotempo-
ral variations in the b-value of earthquake
magnitude-frequency distributions: Classifica-
tion and causes. Tectonophysics 615–616, 1–11.
https://doi.org/10.1016/j.tecto.2013.12.001
Grapenthin, R., F. Sigmundsson, H. Geirsson, Th. Árna-
dóttir and V. Pinel 2006. Icelandic rhythmics: An-
nual modulation of land elevation and plate spread-
ing by snow load. Geophys. Res. Lett. 33, L24305,
https://doi.org/10.1029/2006GL028081
Greenfield, T., R.S. White, T. Winder and Th.
Ágústsdóttir 2018. Seismicity of the Askja
and Bárðarbunga volcanic systems of Ice-
land, 2009–2015. J. Volc. Geothermal Res.
https://doi.org/10.1016/j.jvolgeores.2018.08.010
Guðmundsson, M.T., F. Sigmundsson and H. Björnsson
1997. Ice-volcano interaction of the 1996 Gjálp sub-
glacial eruption, Vatnajökull, Iceland. Nature 389,
954–957.
Gudmundsson, M.T., K. Jónsdóttir, A.Hooper, E.P. Holo-
han, S.A. Halldórsson, B.G. Ófeigsson, S. Cesca,
K.S. Vogfjörd, F. Sigmundsson, Th. Högnadóttir, P.
Einarsson, O. Sigmarsson, A.H. Jarosch, K. Jónas-
son, E. Magnússon, S. Hreinsdóttir, M. Bagnardi,
M. Parks, V. Hjörleifsdóttir, F. Pálsson, T. R. Wal-
ter, M.P.J. Schöpfer, S. Heimann, H.I. Reynolds, S.
Dumont, E. Bali, G.H. Gudfinnsson, T. Dahm, M.
Roberts, M. Hensch, J.M.C. Belart, K. Spaans, S.
Jakobsson, G.B. Gudmundsson, H.M. Fridriksdóttir,
V. Drouin, T. Dürig, G. Adalgeirsdóttir, M.S. Ri-
ishuus, G.B.M. Pedersen and T. van Boeckel 2016.
Gradual caldera collapse at Bárdarbunga volcano, Ice-
land, regulated by lateral magma outflow. Science
aaf8988. https://doi.org/10.1126/science.aaf8988
Heimisson, E.R., P. Einarsson, F. Sigmundsson and B.
Brandsdóttir 2015. Kilometer-scale Kaiser effect iden-
tified in Krafla volcano, Iceland. Geophys. Res. Lett.
42, https://doi.org/10.1002/2015GL065680
Hjartardóttir, Á.R., P. Einarsson, S. Magnúsdóttir, Þ.
Björnsdóttir and B. Brandsdóttir 2016a. Fracture sys-
tems of the Northern Volcanic Rift Zone, Iceland. –
An onshore part of the Mid-Atlantic plate boundary.
In: Wright, T.J., A. Ayele, D.J. Ferguson, T. Kidane
and C. Vye-Brown (eds.). Magmatic Rifting and Ac-
tive Volcanism. Geological Society, London, Special
Publications, 420, http://dx.doi.org/10.1144/SP420.1
Hjartardóttir, Á.R., P. Einarsson, M.T. Guðmundsson
and Th. Högnadóttir 2016b. Fracture movements and
graben subsidence during the 2014 Bárðarbunga dike
intrusion in Iceland. J. Volc. Geothermal Res. 310,
https://doi.org/10.1016/j.jvolgeores.2015.12.002
Hjartarson, Á. 1994. Environmental changes in Iceland
following the Great Þjórsá Lava Eruption 7800 14C
years BP. In: Stötter, J. and F. Wilhelm (eds.). Envi-
ronmental Change in Iceland, München, 147–155.
Hjartarson, Á. and K. Sæmundsson 2014. Bedrock map of
Iceland in 1:600 000. ÍSOR, Reykjavík.
Jakobsdóttir, S.S. 2008. Seismicity in Iceland: 1994–2007.
Jökull 58, 75-100.
JÖKULL No. 69, 2019 81