Earthquake swarms at Upptyppingar, north-east Iceland: A sign of magma intrusion?

Studia Geophysica et Geodaetica

Volumn 52, Issue 4, 2008, Pages 513-528

  Jakobsdottir S S ^a   Roberts, M J ^a   Gudlmundsson G B ^a   Geirsson, H ^a   Slunga, R ^b  

^a ICELANDIC METEOROLOGICAL OFFICE   (Iceland)

^b SWEDISH DEFENCE RESEARCH AGENCY   (Sweden)

Author keywords

Crustal deformation; Ductile crust; Earthquake swarm; Iceland; Magma intrusion

Indexed keywords

CRUSTAL DEFORMATION; EARTHQUAKE SWARM; FOCAL MECHANISM; MICROEARTHQUAKE; SEISMICITY; STRAIN RATE;

EURASIA; EUROPE; ICELAND; NORTHERN EUROPE; SCANDINAVIA;

EID: 57649084913     PISSN: 00393169     EISSN: None     Source Type: Journal    
DOI: 10.1007/s11200-008-0035-x     Document Type: Article

References (47)

1. Arnadottir T., Lund B., Jiang W., Geirsson H., Sturkell E., Sigmundsson F., Einarsson P. and Sigurdsson T., 2007. Rapid uplift and plate spreading observed by GPS in Iceland. EGU General Assembly 2007, Vienna, Austria. Geophysical Research Abstracts, 9, EGU2007-A-07053.
2. Ágústsson, K. and Flóvenz, Ó.G., 2005. The thickness of the seismogenic crust in Iceland and its implications for geothermal systems. Proceedings of the World Geothermal Congress 2005, 24-29 April 2005, Antalya, Turkey (http://iga.igg.cnr.it/geoworld/pdf/ WGC/2005/0743.pdf).
3. Ágústsson K. and Halldórsson P., 2005. Seismic hazard in the Hengill area based on the SIL earthquake catalogue - first results. Report 05015, Icelandic Meteorological Office, 39 pp.
4. Björnsson A., Eysteinsson H. and Beblo M., 2005. Crustal formation and magma genesis beneath Iceland: Magnetotelluric constraints. Plates, Plumes and Paradigms, Special Paper 388, Geological Society of America, 665-686.
5. Böövarsson R., Rögnvaldsson S.T., Jakobsdóttir S.S., Slunga R. and Stefánsson R., 1996. The SIL data acquisition and monitoring system. Seismol. Res. Lett., 67, 35-46.
6. Boettcher M.S., Hirth G. and Evans B., 2007. Olivine friction at the base of oceanic seismogenic zones. J. Geophys. Res., 112, B01205, doi: 10.1029/2006JB004301.
7. Davidson C., Schmid S.M. and Hollister L.S., 1994. Role of melt during deformation in the deep crust. Terra Nova, 6, 133-142.
8. Dell'Angelo L.N. and Tullis J., 1988. Experimental deformation of partially melted granitic aggregates. J. Metamorph. Geol., 6, 6495-6515.
9. DeMets C., Gordon R.G., Argus D.F. and Stein S., 1994. Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions. Geophys. Res. Lett., 21, 2191-2194.
10. De Zeeu-van Dalfsen E., Pedersen R. and Sigmundsson F., 2004. Satellite radar interferometry 1993-1999 suggests deep accumulation of magma near the crust-mantle boundary at the Krafla volcanic system. Geophys. Res. Lett., 31, L13611, doi: 10.1029/2004GL020059.
11. Einarsson P. and Sæmundsson K., 1987. Earthquake epicenters 1982-1985 and volcanic systems in Iceland (map). In: Sigfússon Th.I. (Ed.), Í Hlutarins Eǒli. Festschrift for Thorbjörn Sigurgeirsson, Menningarsjóǒur, Reykjavík.
12. Flóvenz O.G. and Sæmundsson K., 1993. Heat flow and geothermal processes in Iceland. Tectonophysics, 225, 123-138.
13. Geirsson H., Árnadóttir T., Bennett R., LaFemina P., Jónsson S., Hreinsdóttir S., Holland A., Deutscher J., Ingvarsson T., Sturkell E. and Villemin T., 2007. A high-rate continuous GPS network in Iceland for crustal deformation research. Eos Trans. AGU, 88, 1228.
14. Geirsson H., Árnadóttir T., Völksen C., Jiang W., Sturkell E., Villemin T., Einarsson P., Sigmundsson F. and Stefánsson R., 2006. Current plate movements across the Mid-Atlantic Ridge determined from 5 years of continuous GPS measurements in Iceland. J. Geophys. Res., 111, B09407, doi: 10.1029/ 2005JB003717.
15. Grapenthin R., Sigmundsson F., Geirsson H., Árnadóttir T. and Pinel V., 2006. Icelandic rhythmics: Annual modulation of land elevation and plate spreading by snow load. Geophys Res. Lett., 33, L24305, doi: 10.1029/2006GL028081.
16. Jakobsdóttir S.S., 2008. Seismicity in Iceland: 1994-2007. Jókull, 58, 75-100.
17. Jurewics S.R. and Watson E.B., 1985. The distribution of partial melt in a granitic system: The application of liquid phase sintering theory. Geochim. Cosmochim. Acta, 49, 1109-1121.
18. McKenzie D., Jackson J. and Priestley K., 2005. Thermal structure of oceanic and continental lithosphere. Earth Planet. Sci. Lett., 233, 337-349.
19. Mogi K., 1962. Magnitude-frequency relations for elastic shocks accompanying fractures of various materials and some related problems in earthquakes. Bull Earthquake Res. Inst. Univ. Tokyo, 40, 831-853.
20. Needleman A. and Tvergaard V., 2000. Numerical modeling of the ductile-brittle transition. Int. J. Fract., 101, 73-97.
21. Ófeigsson B.G., 2008. Crustal Movements 2005-2007 in the Kárahnjúkar Area, NE-Iceland, in Relation to Formation of the Hálslón Water Reservoir. Report 0801, Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland.
22. Pagli C., Sigmundsson F., Årnadóttir T., Einarsson P. and Sturkell E., 2006. Deflation of the Askja volcanic system: Constraints on the deformation source from combined inversion of satellite radar interferograms and GPS measurements. J. Volcanol. Geotherm. Res., 152, 97-108.
23. Pedersen R. and Sigmundsson F., 2004. InSAR based sill model links spatially offset areas of deformation and seismicity for the 1994 unrest episode at Eyjafjallajökull volcano, Iceland. Geophys. Res. Lett., 31, L14610, doi: 10.1029/2004GL020368.
24. Pedersen R. and Sigmundsson F., 2006. Temporal development of the 1999 intrusive episode in the Eyjafjallajökull volcano, Iceland, derived from InSAR images. Bull. Volcanol., 68, 377-393.
25. Pinel V., Sigmundsson F., Sturkell E., Geirsson H., Einarsson P., Gudmundsson M.T. and Hógnadóttir T., 2007. Discriminating volcano deformation due to magma movements and variable surface loads: application to Katla subglacial volcano, Iceland. Geophys. J. Int., 169, 325-338.
26. R Development Core Team, 2008. R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna, Austria (http://www.R-project.org).
27. Roman D.C., De Angelis S., Latchman J.L. and White R., 2008. Patterns of volcanotectonic seismicity and stress during the ongoing eruption of the Soufrière Hills Volcano, Montserrat (1995-2007). J. Volcanol. Geotherm. Res., 173, 230-244.
28. Rögnvaldsson S.T. and Slunga R., 1993. Routine fault plane solutions for local and regional networks: A test with synthetic data. Bull. Seismol. Soc. Amer., 11, 1247-1250.
29. Sánchez J.J., Gomez D.M., Torres R.A., Calvache M.L., Ortega A., Ponce A.P., Acevedo A.P., Gil-Cruz F., Londono J.M., Rodriguez S.P., Patino J.J. and Bohórquez O.P., 2005. Spatial mapping of the b-value at Galeras volcano, Colombia, using earthquakes recorded from 1995 to 2002. Earth Sci. Res. J., 9, 30-36.
30. Sánchez J.J., McNutt S.R., Power J.A. and Wyss M., 2004. Spatial variations in the frequency-magnitude distribution of earthquakes at Mount Pinatubo volcano. Bull. Seismol. Soc. Amer., 94, 430-438.
31. Scholz C.H., 1968. The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes. Bull. Seismol. Soc. Amer., 58, 399-415.
32. Schorlemmer D., Weimer S. and Wyss M., 2005. Variations in earthquake-size distribution across different stress regimes. Nature, 437, 539-542.
33. Sella G.F., Dixon T. and Mao A., 2002. REVEL: A model for recent plate velocities from space geodesy. J. Geophys. Res., 107, Art.No. 2081, doi: 10.1029/2000JB00033.
34. Sigbjarnarson G., 1993. Northern Vatnajökull II. Stratigraphy and geological map (Norǎan Vatnajökuls II. Jarölagaskipan og jaröfræǒikort). Náttǒrufringurinn, 63, 201-217 (in Icelandic with English summary).
35. Sigmundsson F., Einarsson P., Rögnvaldsson S.T., Foulger G.R., Hodgkinson K.M. and Thorbergsson G., 1997. The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress. J. Geophys. Res., 102, 15151-15161.
36. Sigurbjarnarson G., 1988. Description of geological map units (Krepputunga og Brúardalir). Lýsing á korteiningum jarǒfræikorts. Orkustofnun, OS-88038/VOD-06 (in Icelandic).
37. Slunga R. 1981. Earthquake source mechanism determination by use of body-wave amplitudes - an application to Swedish earthquakes. Bull. Seismol. Soc. Amer., 71, 25-35.
38. Slunga R., Rögnvaldsson S.T. and Bö̈varsson R., 1995. Absolute and relative locations of similar events with application to microearthquakes in southern Iceland. Geophys. J. Int., 123, 409-419.
39. Soosalu H., White R.S., Key A.J., Knox C., Einarsson P. and Jakobsdóttir S., 2008. Lower-crustal earthquakes reflect magma movements beneath the north Iceland rift near Askja. EGU General Assembly 2008, Vienna, Austria. Geophysical Research Abstracts, 10, EGU2008-A-07323.
40. Stefánsson R., Bergerat F., Bonafede M., Böǒvarsson R., Crampin S., Einarsson P., Feigl K.L., Goltz C., Guǒmundsson À., Roth F., Sigbjórnsson R., Sigmundsson F., Suhadolc P., Wyss M., Angelier J., Árnadóttir Th., Belardinelli M.E., Clifton A., Dubois L., Guǒmundsson G.B., Halldórsson P., Hjaltadóttir S., Lund B., Ólafsson S., Richwalski S., Sens-Schönfelder C., Slunga R., Tryggvason A., Vogfjörǒ K.S. and Thorkelsson B., 2005. PREPARED - Second Periodic Report. February 1, 2004-January 31, 2005. Report 05007, Icelandic Meteorological Office, Reykjavik, Iceland, 107 pp.
41. Sturkell E., Sigmundsson F. and Slunga R., 2006. 1983-2003 decaying rate of deflation at Askja caldera: Pressure decrease in an extensive magma plumbing system at a spreading plate boundary. Bull. Volcanol., 68, 727-735.
42. Sæmundsson K., 1979. Outline of the geology of Iceland. Jökull, 29, 7-28.
43. Thorarinsson S. and Sigvaldason G.E., 1962. The eruption in Askja, 1961; a preliminary report. Am. J. Sci., 260, 641-651.
44. Vilhjálmsson A.M., Flóvenz Ó.G., Karlsdóttir R., Årnason K., Eysteinsson H. and Sæmundsson K., 2008. Resistivity survey supports magmatic activity at Upptyppingar N-Iceland. IAVCEI 2008 General Assembly, Reykjavík, Iceland, Abstract 2-f P07 (http://www.iavcei.org/ IAVCEI.htm).
45. Warren N.W. and Latham G.V., 1970. An experimental study of thermally induced microfracturing and its relation to volcanic seismicity. J. Geophys. Res., 75, 4455-4464.
46. Wessel P. and Smith W.H.F., 1998. New, improved version of Generic Mapping Tools released. EOS Trans. AGU, 79, 579.
47. Wiemer S. and Benoit J., 1996. Mapping the b-value anomaly at 100 km depth in the Alaska and new Zealand subduction zones. Geophys. Res. Lett., 23, 1557-1560.