Jökull - 01.01.2021, Page 148
Tryggvason E. 1982. The NVI magnetoresistor tiltmeter,
results of observations 1977–1981. Nordic Volcano-
logical Institute, research report 8203, 44 pp.
Tryggvason E. 1983. Distance measurements in the
Gjástykki - Krafla - Mývatn area 1979–1982. Progress
report. Nordic Volcanological Institute, research re-
port 8301, 48 pp.
Tryggvason E. 1983. Accuracy of tilt observations through
optical leveling. Nordic Volcanological Institute, re-
search report 8302, 31 pp.
Tryggvason E. 1983. The widening of the Krafla fis-
sure swarm during the 1975–1981 volcano-tectonic
episode. Nordic Volcanological Institute, research re-
port 8304, 48 pp.
Tarantola, A., E. Tryggvason and A. Nercessian 1983. Vol-
canic or seismic prediction as an inverse problem. An-
nales Geophysicae 1, 443–450.
Tryggvason E. 1984. Widening of the Krafla fissure swarm
during the 1975–1981 volcano-tectonic episode. Bull.
Volcanol. 47, 47–69.
Tryggvason E. 1986. Multiple magma reservoirs in a
rift zone volcano: Ground deformation and magma
transport during the September 1984 eruption of
Krafla, Iceland. J. Volcanol. Geothermal Res. 28, 1–
44. https://doi.org/10.1016/0377-0273(86)90003-X
Tryggvason E. 1986. Progressive tilt in the Krafla-Mývatn
area 1976–1985. Nordic Volcanological Institute, re-
port 8601, 37 pp.
Tryggvason E. 1986. Vertical ground movement in the
Krafla region 1977–1986. Byproduct of distance mea-
surements. Nordic Volcanological Institute, research
report 8602, 31 pp.
Tryggvason E. 1986. The 1975–1981 rifting episode in
North Iceland. Royal Society of New Zealand Bull. 24,
349–355.
Tryggvason E. 1987. Mývatn lake level observations
1984–1986 and ground deformation during a Krafla
eruption. J. Volcanol. Geothermal Res. 31, 131–138.
https://doi.org/10.1016/0377-0273(87)90010-2
Tryggvason E. 1989. Measurement of ground deformation
in Askja 1966 to 1989. Nordic Volcanological Insti-
tute, research report 8904, Reykjavík 1989, 65 pp.
Tryggvason E. 1989. Ground deformation in Askja, Ice-
land: Its source and possible relation to flow of the
mantle plume. J. Volcanol. Geothermal Res. 39, 61–
71. https://doi.org/10.1016/0377-0273(89)90021-8
Eysteinn Tryggvason 1990. Höggun Almannagjár. Mæl-
ingar á Þingvöllum 1990. Nordic Volcanological Insti-
tute, research report 9001, 24 pp.
Banks, N., C. Carvajal, H. Mora and E. Tryggvason
1990. Deformation monitoring of Nevado del Ruiz,
Colombia -October 1985 – March 1988. J. Volcanol.
Geothermal Res. 1(1-4), 269–295. https://doi.org/-
10.1016/0377-0273(90)90092-T
Tryggvason E. 1991. Magnitude of deformation of active
volcanoes in Iceland. Cahiers du Centre Européen de
Géodynamique et de Séismologie 4, 37–49.
Eysteinn Tryggvason 1991. Stöng og önnur eyðibýli við
norðanvert Mývatn. Árbók Þingeyinga, bls. 25.
Eysteinn Tryggvason 1991. Kröflueldar. Óprentað handrit,
sjá vefsíðu Jarðvísindastofnunar. Bæta þarf inn hlekk
á skjalið
Einarsson, P., S. Björnsson and E. Tryggvason 1991.
Iceland’s Hekla erupts. Eos Transactions 72(6), 51.
https://doi.org/10.1029/EO072i006p00051
Tryggvason E. 1992. Höskuldsvatn: Cause of unusually
high lake level in 1991. Jökull 42, 25–29.
Rymer, H. and E. Tryggvason 1993. Gravity and elevation
changes at Askja, Iceland. Bull. Volcanol. 55, 362–
371.
Tryggvason E. 1993. Distance measurements in the
Krafla-Gjástykki area 1983–1993. Nordic Volcano-
logical Institute, research report 9302, 199 pp.
Tryggvason E. 1994. Observed ground deformation at
Hekla, Iceland prior to and during the eruptions of
1970, 1980–1981 and 1991. J. Volcanol. Geother-
mal Res. 61, 281– 291. https://doi.org/10.1016/0377-
0273(94)90009-4
Tryggvason E. 1994. Surface deformation at the Krafla
volcano, North Iceland, 1982–1992. Bull. Volcanol.
56, 98–107.
Tryggvason, E. and H. Ólafsson 1994. Skorradalsvatn.
Lake level measurements 1982-1993. NVI Research
Report 9402, 21 pp.
Tryggvason E., M. M. Alves, J. L. Alves, J. C. Nunes and
H. Ólafsson 1994. Furnas volcano, ground deforma-
tion measurements 1991–1993. Nordic Volcanological
Institute, research report 9401, 19 pp.
Tryggvason, E. 1995. Precision of Tilt-Leveling on Ac-
tive Volcanoes in Iceland. In: Barthemely et al. (eds.)
New challenges for Geodesy in Volcanoes Monitor-
ing, Workshop Proceedings 8, 193, C.E.G.S., Luxem-
bourg.
Tryggvason E. and H. Ólafsson 1995. Kleifarvatn, lake
level measurements 1985–1994. Nordic Volcanologi-
cal Institute, research report 9502, 10 pp.
146 JÖKULL No. 71, 2021