Structure of the Grímsvötn central volcano under the Vatnajökull icecap, Iceland

Geophysical Journal International

Volumn 168, Issue 2, 2007, Pages 863-876

  Alfaro, Raimon ^a   Brandsdóttir, Bryndís ^b   Rowlands, Daniel P ^a   White, Robert S ^a   Gudmundsson, Magnús T ^b  

^a UNIVERSITY OF CAMBRIDGE   (United Kingdom)

^b UNIVERSITY OF ICELAND   (Iceland)

Author keywords

Earthquake location; Iceland; Tomography; Volcanic systems

Indexed keywords

CALDERA; CRUSTAL STRUCTURE; SEISMIC TOMOGRAPHY; VOLCANIC EARTHQUAKE; VOLCANO;

ARCTIC; GRIMSVOTN; ICELAND; VATNAJOKULL;

EID: 33846654867     PISSN: 0956540X     EISSN: 1365246X     Source Type: Journal    
DOI: 10.1111/j.1365-246X.2006.03238.x     Document Type: Article

References (63)

1. Achauer, U., Greene, L., Evans, J.R. & Iyer, H.M., 1986. Nature of the magma chamber underlying the Mono Craters area, eastern California, as determined from teleseismic travel time residuals, J. geophys. Res., 91, 13873-13891.
2. Allen, R.M. et al., 2002. Plume-driven plumbing and crustal formation in Iceland, J. geophys. Res., 107, 101029/2001JN000584.
3. Björnsson, H. & Einarsson, P., 1990. Volcanoes beneath Vatnajökull, Iceland: Evidence from radio echo-sounding, earthquakes and jökulhlaups, Jökull, 40, 147-167.
4. Björnsson, H., Björnsson, S. & Sigurgeirsson, Th., 1982. Penetration of water into hot rock boundaries of magma at Grímsvötn, Nature, 295, 580-581.
5. Björnsson, H. & Gudmundsson, M.T., 1993. Variations in the thermal output of the subglacial Grímsvötn caldera, Iceland, Geophys. Res. Lett., 20, 2127-2130.
6. Björnsson, H., Rott, H., Gudmundsson, S., Fischer, A., Siegel, A. & Gudmundsson, M.T., 2001. Glacier-volcano interactions deduced by SAR interferometry, J. Glaciology, 47, 58-70.
7. Brandsdóttir, B., 1984. Seismic activity in Vatnajökull in 1900-1982 with special reference to Skeioarárhlaups, Skaftárhlaups and Vatnajökull eruptions, Jökull, 34, 141-150.
8. Brandsdóttir, B., Menke, W.H., Einarsson, P., White, R.S. & Staples, R.K., 1997. Färoe-Iceland Ridge Experiment 2. Crustal structure of the Krafla central volcano, J. geophys. Res., 102, 7867-7886.
9. Darbyshire, F.A., Bjarnason, I.Th., White, R.S. & Flóvenz, Ó.G., 1998. Crustal structure above the Iceland mantle plume imaged by the ICEMELT refraction profile, Geophys. J. Int., 135, 1131-1149.
10. Darbyshire, F.A., White, R.S. & Priestley, K.P., 2000. Structure of the crust and uppermost mantle of Iceland from a combined seismic and gravity study, Earth planet. Sci. Lett., 181, 409-428.
11. Eberhart-Phillips, D., 1986. Three dimensional velocity structure in northern California Coast Ranges from inversion of local earthquake arrival time. Bull. Seism. Soc. Am., 76, 1025-1052.
12. Eberhart-Phillips, D., 1990. Three-dimensional P and S velocity structure in the Coalinga region, California, J. geophys. Res., 95, 343-363.
13. Eberhart-Phillips, D., 1993. Local earthquake tomography: Earthquake source regions, in Seismic Tomography: Theory and Practice, eds. Iyer, H.M. & Hirahara, K., 614-643, Chapman and Hall, New York.
14. Einarsson, P., 1978. S-wave shadows in the Krafla caldera, NE-Iceland, evidence for a magma chamber in the crust, Bull. Volcanol., 41, 1-9.
15. Einarsson, P., 1991. Earthquakes and present-day tectonism in Iceland, Tectonophysics, 189, 261-279.
16. Einarsson, P. & Brandsdóttir, B., 1984. Seismic activity preceding and during the 1983 volcanic eruption in Grímsvötn, Iceland, Jökull, 34, 13-23.
17. Einarsson, P. & Saemundsson, K., 1987. Earthquake epicenters 1982-1985 and volcanic systems in Iceland. A map in: Íhlutarins eoli: Festschrift for porbjörn Sigurgeirsson, ed Sigfússon, p. I., Menningarsjóour, Reykjavík.
18. Einarsson, P., Brandsdóttir, B., Guomundsson, M.T., Björnsson, H., Grönvold, K. & Sigmundsson, F., 1997. Centre of the Icelandic hotspot experiences volcanic unrest, EOS Trans. Am. geophys. Un., 78, 369-375.
19. Flóvenz, Ó.G. & Gunnarsson, K., 1991. Seismic crustal structure in Iceland and surrounding area, Tectonophysics, 189, 1-17.
20. Gudmundsson, M.T., 1989. The Grímsvötn caldera, Vatnajökull: Subglacial topography and structure of caldera infill, Jökull, 39, 1-20.
21. Gudmundsson, M.T. & Björnsson, H., 1991. Eruptions in Grímsvötn, Vatnajökull, Iceland, 1934-1991, Jökull, 41, 21-45.
22. Gudmundsson M.T., 1992. The crustal structure of the subglacial Grímsvötn volcano, Vatnajokull, Iceland from multiparameter geophysical surveys, Ph.D. dissertation, University of London, London.
23. Gudmundsson, M.T. & Milsom, J., 1997. Gravity and magnetic studies of subglacial Grímsvötn volcano Iceland: Implications for crustal and thermal structure, J. geophys. Res., 102, 7691-7704.
24. Gudmundsson, M.T., Sigmundsson, F. & Björnsson, H., 1997. Ice-volcano interaction of the 1996 Gjálp subglacial eruption, Vatnajökull, Iceland, Nature, 389, 954-957.
25. Gudmundsson, M.T. & Högnadóttir, p., 2002. Internal structure of active volcanoes in Iceland deduced from gravity modelling, The 25th Nordic Geological Winter Meeting, Abstracts, p. 66, Reykjavík.
26. Gudmundsson, Ó., 2003. The dense root of the Iceland crust, Earth planet. Sci. Lett., 206, 427-440.
27. Gudmundsson, O., Brandsdóttir, B., Menke, W. & Sigvaldason, G.E., 1994. The crustal magma chamber of the Katla volcano in south Iceland revealed by 2-D seismic undershooting, Geophys. J. Int., 119, 277-296.
28. Haslinger, F., 1999. Velocity structure and seismotectonics of northwestern Greece between the Gulf of Arta and Zakynthos, PhD. dissertation, ETH, Zurich.
29. Haslinger, F. et al., 1999. 3D crustal structure from local earthquake tomography around the Guld of Arta (Ionian Region, NW Greece), Tectonophysics, 304, 210-218.
30. Henstock, T.J., Woods, A.W. & White, R.S., 1993. The accretion of oceanic crust by episodic sill intrusion, J. geophys. Res., 98, 4143-4161.
31. Jakobsdóttir, S.J., Gudmundsson, G.B. & Stefánsson, R., 2002. Seismicity in Iceland 1991-2000 monitored by the SIL seismic system, Jökull, 51, 87-94.
32. Kissling, E., Ellsworth, W.L., Eberhart-Phillips, D. & Kradolfer, U., 1994. Initial reference models in seismic tomography, J. geophys. Res., 99, 19635-19646.
33. Kissling, E., Husen, S. & Haslinger, F., 2001. Model parametrization in seismic tomography: A choice of consequence for the solution quality, Phys. Earth Planet. Int., 123, 89-101.
34. Klein, F.W., 1978. Hypocenter location program HYPOINVERSE, I, Users guide to versions 1, 2, 3, and 4, U.S. Geol. Surv. Open File Report 78-694.
35. Larsen, G., 1984. Recent volcanic history of the Veidivötn fissure swarm, southern Iceland, an approach to volcanic risk assessment, J. Volcanol. Geotherm. Res., 22, 33-58.
36. Larsen, G., Gudmundsson, M.T. & Björnsson, H., 1998. Eight centuries of periodic volcanism at the center of the Iceland hotspot revealed by glacier tephrostratigraphy, Geology, 26, 943-946.
37. Magde, L.S., Barclay, A.H., Toomey, D.R., Detrick, R.S. & Collings, J.A., 2000. Crustal magma plumbing within a segment of the Mid-Atlantic Ridge, 35°N, Earth planet. Sci. Lett., 175, 55-67.
38. Menke, W., Brandsǒttir, B., Einarsson, P. & Bjarnason, I.Th., 1996. Reinterpretation of the RRISP-77 Iceland shear-wave profiles, Geophys. J. Int., 126, 166-172.
39. Menke, W., West, M., Brandsdóttir, B. & Sparks, D., 1998. Compressional and shear velocity structure of the lithosphere in northern Iceland, Bull. Seism. Soc. Am., 88, 1561-1571.
40. Miller, A.D., Julian, B. & Foulger, G.R., 1998. Three-dimensional seismic structure and moment tensors of non double couple earthquakes at the Hengill-Grensdalur volcanic complex, Geophys. J. Int., 1333, 309-325.
41. Murase, T. & McBirney, A.R., 1973. Properties of some common igneous rocks and their melts at high temperatures, Geol. Soc. Am. Bull., 84, 3562-3592.
42. Pálmason, G., 1971. Crustal structure of Iceland from Explosion Seismology, 187 pp, Soc. Sci. Isl. Reykjavík.
43. Podvin, P. & Lecomte, I., 1991. Finite difference computation of travel times in very contrasted velocity models: A massively parallel approach and its associated tools, Geophys. J. Int., 105, 271-284.
44. Reasenberg, P.A. & Oppenheimer, D., 1985. FPFIT, FPPLOT and FPPAGE: Fortran computer programs for calculating and displaying earthquake fault-plane solutions, U.S. Geol. Surv. Open File Report 85-739, 46 pp.
45. Reyners, M., Eberhart-Phillips, D. & Stuart, G., 1999. A three-dimensional image of shallow subduction: Crustal structure of the Raukumara Peninsula, New Zealand, Geophys. J. Int., 137, 873-890.
46. Saemundsson, K., 1978. Fissure swarms and central volcanoes of the neovolcanic zones of Iceland, in Crustal evolution in northwestern Britain and adjacent regions, eds. Bowes, D.R. & Leake, B.E., Geol. J. Spec. Issue, 10, 415-432.
47. Saemundsson, K., 1979. Fissure swarms and central volcanoes of the neovolcanic zones of Iceland, Geol. J., 19, 415-432.
48. Sigmarsson, O., Hémond, C., Condomines, M., Fourcade, S. & Oskarsson, N., 1991. Origin of silicic magma in Iceland revealed by Th isotopes, Geology, 19, 621-624.
49. Sigurdsson, H. & Sparks, R.S.J., 1978. Lateral magma flow within rifted Icelandic crust, Nature, 274, 96-97.
50. Sturkell, E., Einarsson, P., Sigmundsson, F., Hreinsdóttir, S. & Geirsson, H., 2003. Deformation of Grímsvötn volcano, Iceland: 1998 eruption and subsequent inflation, Geophys. Res. Lett. 30, 1182, doi:.
51. Sturkell, E. et al., 2006. Volcano geodesy and magma dynamics in Iceland, J. Volcanol. Geotherm. Res. 150, 14-34.
52. s Theory, in, Seismic Tomography: Theory and Practice, eds Iyer H.M. & Hirahara, K., pp. 563-583, Chapman and Hall, New York.
53. Thurber, C.H. & Eberhart-Phillips, D., 1999. Local earthquake tomography with flexible gridding, Computers and Geosciences, 25, 809-818.
54. Toomey, D.R. & Foulger, G.R., 1989. Tomographic Inversion of Local Earthquake Data from the Hengill-Grensdalur Central Volcano Complex, Iceland, J. geophys. Res., 94, 17497-17510.
55. Tryggvason, E., 1973. Seismicity, earthquake swarms and plate boundaries in the Iceland region, Bull. Seism. Soc. Am., 63, 1327-1348.
56. 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. Geotherm. Res., 28, 1-44.
57. Tryggvason, E., 1989. Ground deformation in Askja, Iceland: Its source and possible relation to flow of the mantle plume, J. Volcanol. Geotherm. Res., 39, 61-71.
58. Um, J. & Thurber, G.H., 1987. A fast algorithm for two-point seismic ray tracing, Bull. Seism. Soc. Am., 77, 972-986.
59. Vidale, J.E., 1990. Finite-difference calculations of travel times in three-dimensions, Geophysics, 55, 521-526.
60. Vogfjörd, K. et al., 2005. Forecasting and monitoring a subglacial eruption in Iceland, EOS Trans. Am. geophys. Un., 86, 245, 248-249.
61. Weir, N.R.W., White, R.S., Brandsdóttir, B., Einarsson, P., Shimamura, H., Shiobara, H. & the RISE Fieldwork Team, 2001. Crustal structure of the Northern Reykjanes Ridge and Reykjanes Peninsula, South-west Iceland. J. geophys. Res., 106, 6347-6368.
62. White, R.S., Brown, J.W. & Smallwood, J.R., 1995. The temperature of the Iceland plume and origin of outward propagating V-shaped ridges, J. Geol. Soc. Lond., 152, 1039-1045.
63. Zelt, C.A. & Smith, R.B., 1992. Seismic traveltime inversion for 2-D crustal velocity structure, Geophys. J. Int., 108, 16-34.