3/11/2014Joint 1D inversion of TEM and MT data and 3D inversion of MT data in the Hengill area, SW Iceland - Geothermics - Tom 39, Numer 1 (2010) - Biblioteka… Artykuł - szczegóły Geothermics 2010 | 39 | 1 | 13-34 Joint 1D inversion of TEM and MT data and 3D inversion of MT data in the Hengill area, SW Iceland Knútur Árnason Hjálmar Eysteinsson Gylfi Páll Hersir Abstrakty: EN An extensive study of the resistivity structure of the Hengill area in SW Iceland was carried out by the combined use of TEM and MT soundings. Joint inversion of the collected data can correct for static shifts in the MT data, which can be severe due to large near-surface resistivity contrasts. Joint 1D inversion of 148 TEM/MT sounding pairs and a 3D inversion of a 60 sounding subset of the MT data were performed. The 3D inversion was based on full MT impedance tensors previously corrected for static shift. Both inversion approaches gave qualitatively similar results, and revealed a shallow resistivity layer reflecting conductive alteration minerals at temperatures of 100–240°C. They also delineated a deep conductor at 3–10km depth. The reason for this deep-seated high conductivity is not fully understood. The distribution of the deep conductors correlates with a positive residual Bouguer gravity anomaly, and with transform tectonics inferred from seismicity. One model of the Hengill that is consistent with the well temperature data and the deep conductor that does not attenuate S-waves, is a group of hot, solidified, but still ductile magmatic intrusions that are closely associated with the heat source for the geothermal system. Słowa kluczowe: EN Geothermal Hengill volcanic complex Resistivity structure Joint inversion 3D inversion Joint interpretation Volcanology Iceland Wydawca: Elsevier Science Czasopismo: Geothermics , ISSN 03756505 Rocznik: 2010 Tom: 39 Numer: 1 Strony: 13-34 Twórcy: autor Knútur Árnason ,
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