Jökull


Jökull - 01.01.2015, Side 58

Jökull - 01.01.2015, Side 58
J. Schuler et al., ÁGRIP Jarðskjálftavirkni á Þeistareykjasvæðinu var könnuð með neti færanlegra jarðskjálftamæla á árunum 2009– 2012. Skjálftavirknin var aðallega bundin við vest- urhluta Bæjarfjalls, í þyrpingu með upptök á 2–5 km dýpi sunnan jarðhitasvæðisins. Dreif af mun dýpri skjálftum mældust suðaustur af Þeistareykj- um, á 8–20 km dýpi, í deiga hluta jarðskorpunnar. Djúpu skjálftarnir liggja á milli sprungusveima Þeista- reykja og Kröflu, nálægt upptökum Borgarhrauns og gætu tengst kvikuhreyfingum innan gosbeltisins, en einnig spennubreytingum innan Húsavíkur-Flateyjar- brotabeltisins. REFERENCES Aki, K. 1965. Maximum likelihood estimate of b in the formula logN = a – bM and its confidence limits. Bull. Earthquake Res. Inst. 43, 237–239. Ali, S. T., K. L. Feigl, B. B. Carr, T. Masterlark and F. Sigmundsson 2014. Geodetic measurements and numerical models of rifting in Northern Iceland for 1993–2008. Geophys. J. Int. 196, 1267–1280, doi:10.1093/gji/ggt462. Ármannsson, H. 2014. The Þeistareykir geothermal sys- tem, North East Iceland: case history. Short Course IX on Exploration for Geothermal Resources, United Na- tions University, Kenya, 11 pp. Árnason, K., R. Karlsdóttir, H. Eysteinsson, Ó. G. Flóvenz and S. T. Gudlaugsson 2008. The resistivity structure of high-temperature geothermal systems in Iceland. Short Course III on Exploration of Geothermal Re- sources, United Nations University, Kenya, 11 pp. Bender, B. 1983. Maximum likelihood estimation of b val- ues for magnitude grouped data. Bull. Seism. Soc. Am. 73, 831–851. Beyreuther, M., R. Barsch, L. Kirscher, T. Megies, Y. Behr and J. Wassermann 2010. ObsPy: A Python Toolbox for Seismology. Seism. Res. Lett. 81, 530–533. Brandsdóttir, B., M. Parsons, R. S. White, Ó. Guðmunds- son, J. Drew and B. S. Þorbjarnardóttir 2011. The May 29th 2008 earthquake aftershock sequence within the South Iceland Seismic Zone: Fault locations and source parameters of aftershocks. Jökull 60, 23–46. Drew, J., R. S. White, F. Tilmann and J. Tarasewicz 2013. Coalsescence microseismic mapping. Geophys. J. Int. 195, 1773–1785. Drouin, V., S. Hreinsdóttir, K. Spaans and F. Sigmundsson 2013. Crustal deformation in the Krafla, Gjástykki and Þeistareykir areas inferred using GPS and InSAR tech- niques, Status report for 2012. Landsvirkjun LV-2013- 038, and Nordic Volcanol. Center, Institute of Earth Sciences report 1301, University of Iceland, 31 pp. Einarsson, P. and K. Sæmundsson 1987. Earthquake epi- centers 1982–1985 and volcanic systems in Iceland (map). In: Sigfússon, Þ. I. (ed.) Í hlutarins eðli, Fest- schrift for Þorbjörn Sigurgeirsson. Menningarsjóður, Reykjavík. Gíslason, G., G. V. Johnsen, H. Ármannsson, H. Torfa- son and K. Árnason 1984. Þeistareykir: Surface explo- ration of the high-temperature geothermal area (in Ice- landic). Orkustofnun, report OS-84089/JHD-16, Ice- land, 134 pp. Greenfield, T. and R. S. White 2015. Building Icelandic igneous crust by repeated melt injections. J. Geophys. Res. 120, 7771–7788. Hjaltadóttir, S. and K. S. Vogfjörð 2011. Sprungukort- lagning við Þeistareyki og Bjarnarflag með háupp- lausnarstaðsetningum smáskjálfta. (Subsurface faults in Þeistareykir and Bjarnarflag delineated by relative earthquake locations). Landsvirkjun report LV-2011- 116, 44 pp. Hjartardóttir, A. R., P. Einarsson, S. Magnúsdóttir, Þ. Björnsdóttir and B. Brandsdóttir 2015. Fracture sys- tems of the Northern Volcanic Rift Zone, Iceland: an onshore part of the Mid-Atlantic plate boundary. In: Magmatic Rifting and Active Volcanism. Wright, T. J., A. Ayele, D. J. Ferguson, T. Kidane and C. Vye- Brown, (eds.). Geol. Soc. London Spec. Publ. 420, doi:10.1144/SP420.1. Karlsdóttir, R., A. M. Vilhjálmsson, K. Árnason and A. T. Beyene 2012. Þeistareykir geothermal Area, Northern Iceland: 3D inversion of MT and TEM data. ISOR- 2012/046 report, Iceland, 173 pp. Kissling, E., W. L. Ellsworth, D. Eberhart-Philips and U. Kradolfer 1994. Initial reference models in local earthquake tomography. J. Geophys. Res. 99, 19635– 19646. Lomax, A., A. Michelini and A. Curtis 2009. Earthquake location, direct, global-search methods. Encyclope- dia of Complexity and System Science. Meyers, R. A. (ed.), 2449–2473, Springer, New York. Maclennan, J., D. McKenzie, F. Hilton, K. Grönvold and N. Shimizu 2003. Geochemical variability in a single 58 JÖKULL No. 65, 2015
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