A5036902076- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Seismic Imaging and Inversion Techniques
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Rock Mechanics and Modeling
- Seismic Waves and Analysis
- Paleontology and Stratigraphy of Fossils
- Groundwater flow and contamination studies
- Drilling and Well Engineering
- Geophysical and Geoelectrical Methods
- Geological and Geophysical Studies
- Geological Modeling and Analysis
- Geothermal Energy Systems and Applications
- Geological formations and processes
- Astro and Planetary Science
- CO2 Sequestration and Geologic Interactions
- Hydraulic Fracturing and Reservoir Analysis
- ERP Systems Implementation and Impact
- Reservoir Engineering and Simulation Methods
Leibniz Institute for Applied Geophysics
2024
Uppsala University
2012-2018
University of Göttingen
2009-2018
Magmatic sheet intrusions (dykes) constitute the main form of magma transport in Earth's crust. The size distribution dykes is a crucial parameter that controls volcanic surface deformation and eruption rates required to realistically model volcano for forecasting. Here we present statistical analyses 3,676 dyke thickness measurements from different tectonic settings show consistently follows Weibull distribution. Known materials science, power law-distributed flaws brittle lead...
Minimizing exploration risk in deep geothermics is of great economic importance. Especially, knowledge about temperature and permeability the reservoir essential. We test potential an outcrop analogue study to minimize uncertainties prediction rock properties a fractured Upper Rhine Graben. Our results show that although mineralogical composition, clay content, grain size, fabric type are basically comparable, porosity quartz cementation not. Young’s modulus, as observed closest twice high...
Abstract The 2014–2015 Holuhraun eruption on Iceland was located within the Askja fissure swarm but accompanied by caldera subsidence in Bárðarbunga central volcano 45 km to southwest. Geophysical monitoring of identified a seismic that migrated from site over course two weeks. In order better understand this lateral connection between and Holuhraun, we present mineral textures compositions, mineral‐melt‐equilibrium calculations, whole rock trace element data, oxygen isotope ratios for...
Abstract. The quality of geothermal carbonate reservoirs is controlled by, for instance, depositional environment, lithology, diagenesis, karstification, fracture networks, and tectonic deformation. Carbonatic rock formations are thus often extremely heterogeneous, reservoir parameters their spatial distribution difficult to predict. Using a 3D seismic dataset combined with well data from Munich, Germany, we demonstrate how comprehensive attribute analysis can significantly improve the...
Research Article| January 01, 2012 The Slaufrudalur pluton, southeast Iceland—An example of shallow magma emplacement by coupled cauldron subsidence and magmatic stoping Steffi Burchardt; Burchardt † 1Institute for Geosciences, Solid Earth Geology, University Uppsala, Villavägen 16, 75236 Sweden2Geoscience Center the Georg-August Göttingen, Goldschmidtstrasse 1, 37077 Germany †E-mail: steffi.burchardt@geo.uu.se Search other works this author on: GSW Google Scholar David Tanner; Tanner...
Sheet intrusions (inclined sheets and dykes) in the deeply-eroded volcanoes of Geitafell Dyrfjöll, Eastern Iceland, were studied at surface to identify location, depth, size their magmatic source(s).For this purpose, measured orientations inclined projected three dimensions produce models sheet-swarm geometries.For Volcano, majority converge towards a common focal area with diameter least 4 7 km, location which coincides several gabbro bodies exposed surface.Assuming that these gabbros...
Abstract Recent fieldwork in Nordenskiöld Land, Svalbard's Southwestern Basement Province, has established the presence of high‐pressure ( HP ) lithologies. They are strongly retrogressed blueschists consisting mainly garnet and Ca‐amphibole with remnants ferroglaucophane phengite. The pressure–temperature P–T conditions were estimated using phase equilibrium modelling NCKFMM n ASHTO system. estimates based on garnet, phengite compositional isopleths modelled paragenetic assemblage indicate...
Abstract. In recent years, the electromagnetic radiation (EMR) method has been used to detect faults and determine main horizontal stress directions from variations in intensities directional properties of emissions, which are assumed be generated during micro-cracking. Based on a large data set taken an area about 250 000 km2 Northern Germany, Denmark, southern Sweden with repeated measurements at one location time span 1.5 yr, was systematically tested. Reproducible observations temporary...
Abstract. Geothermal energy is an important and sustainable resource that has more potential than currently utilized. Whether or not a deep geothermal can be exploited, mostly depends on, besides temperature, the utilizable reservoir volume over time, which in turn largely on petrophysical parameters. We show, using 1000 (n=1027) 4-D finite-element models of simple doublet, lifetime complex function its geological parameters, their heterogeneity, background hydraulic gradient (BHG). In our...
ABSTRACT The Icelandic crust is characterized by low δ 18 O values that originate from pervasive high-temperature hydrothermal alteration O-depleted meteoric waters. Igneous rocks in Iceland with significantly higher than unaltered oceanic (~5.7‰) are therefore rare. Here we report on rhyolitic intra-caldera samples a cluster of Neogene central volcanoes Borgarfjörður Eystri, Northeast Iceland, show whole-rock between +2.9 and +17.6‰ ( n = 6), placing them among the highest thus far recorded...
During the first week of 2011 El Hierro submarine eruption, abundant light-coloured pumiceous, high-silica volcanic bombs coated in dark basanite were found floating on sea. The composition frothy material (‘xeno-pumice’) is akin to that sedimentary rocks from region, but textures resemble felsic magmatic pumice, leaving their exact mode formation unclear. To help decipher origin, we investigated representative xeno-pumice samples using X-ray computed microtomography for internal vesicle...
The ‘forgotten fjords’ and ‘deserted inlets’ of NE‐Iceland, in the region between Borgarfjörður Eystri Loðmundarfjörður, are not only prominent because their pristine landscape, alleged elfin settlements, puffins that breed harbour, but also for magnificent geology. From a geological point view, area may hold Iceland's best kept secret. greater hosts mountain chains consist voluminous colourful silicic rocks concentrated within surprisingly small (Fig. ), represent second‐most occurrence...
Abstract. In recent years, the ElectroMagnetic Radiation (EMR) method has been used to detect faults and determine main horizontal stress directions from variations in intensities directional properties of electromagnetic emissions, which are assumed be generated during micro-cracking. Based on a large data set taken an area about 250 000 km2 Northern Germany, Denmark, Southern Sweden with repeated measurements at one location time span 1.5 yr, was systematically tested. Reproducible...
Abstract The Upper Jurassic carbonate aquifer in the German Molasse Basin (S Germany) below Munich is focus of exploitation geothermal energy. To implement wells, meaningful prediction reservoir quality (e.g., volume, temperature, location aquifers, porosity, permeability) required. However, permeability this often highly heterogeneous and anisotropic, as other karst- fracture systems. Based on geophysical well logs from six a 3D porosity model, side-wall cores, we provide comprehensive...