A5051880517- Geomagnetism and Paleomagnetism Studies
- Geological and Geophysical Studies
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geological Studies and Exploration
- Geophysics and Gravity Measurements
- Seismic Imaging and Inversion Techniques
- Hydrocarbon exploration and reservoir analysis
- Geophysical and Geoelectrical Methods
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Geological Modeling and Analysis
- Seismic Waves and Analysis
- Geophysical Methods and Applications
- Seismology and Earthquake Studies
- Geochemistry and Geologic Mapping
- Reservoir Engineering and Simulation Methods
- Scientific Research and Discoveries
- Inertial Sensor and Navigation
- Landslides and related hazards
- Libraries and Information Services
- Library Science and Information Systems
- Cryospheric studies and observations
- Paleontology and Stratigraphy of Fossils
Norwegian Geological Survey
2013-2024
Dalhousie University
2009-2016
Universität Hamburg
2005
Federal Institute for Geosciences and Natural Resources
2005
Models for glacial isostatic adjustment (GIA) can provide constraints on rheology of the mantle if past ice thickness variations are assumed to be known. The Pleistocene loading histories that used obtain such based an a priori 1-D viscosity profile assumes single deformation mechanism rocks. Such simplified makes it hard compare inferred inferences from seismology and laboratory experiments. It is unknown what GIA observations more realistic with history not profile. This paper investigates...
The Perdido Fold Belt (PFB) is a prominent salt‐cored deep water structure in the northwestern Gulf of Mexico. It characterized by symmetric, kink‐banded folds ∼4.5 km thick prekinematic layer and its vicinity to extensive Sigsbee Salt Canopy. We use 2‐D finite element numerical models study evolution PFB as gravity‐driven fold belt both local context larger‐scale passive margin, influenced adjacent allochthonous salt structures. show that parameters such overburden strength, geometry, or...
We investigate the influence of glacial isostatic adjustment (GIA) on deformation at surface and seismogenic depths in Fennoscandia. The strain rate field, derived from geodetic data, is controlled by GIA which causes NW–SE extension up to 4 × 10−9 yr−1 most mainland Fennoscandia, surrounded regions radial shortening towards centre uplift. seismic a new compilation focal mechanisms, shows consistent compression Norwegian continental margin tendency tension moment least two orders magnitude...
Abstract Seismic refraction data and results from receiver functions were used to compile the depth basement Moho in NE Atlantic Ocean. For interpolation between unevenly spaced points, kriging technique was used. Free-air gravity as constraints process for basement. That way, structures with little or no seismic coverage are still presented on map, particular basins off East Greenland. The rift NW Europe mapped a continuous zone depths of 5 15 km. Maximum Greenland 8 km, but these probably...
[1] Three primary salt tectonic structural styles of the Scotian Basin are compared with plane strain finite element models in order to investigate their origin. Here, we focus on simplified model basins initial rectangular cross-sectional geometries and follow evolution context parametric thermal subsidence under various sedimentation regimes. Structural style A, an open-ended roho system a synkinematic wedge, is reproduced by including deltaic progradation seaward spreading/gliding...
The Scandinavian Mountain Chain (the Scandes) exhibits characteristics that are unusual for an old, Palaeozoic mountain belt. These include renewed Neogene uplift in a passive margin setting and the lack of pronounced crustal root. We investigate influence present-day thermal, compositional geometric structures crust mantle on topography southern Scandes resulting implications tectonic history Fennoscandia.
SUMMARY The Nordland region, Northern Norway, situated in an intraplate continental setting, has the highest seismicity rate mainland Norway. However, exact cause of this region is still debated. Better understanding factors that influence can help increase knowledge general. Here, we address problem with aid a new high-resolution 3-D VP and VP/VS ratio images crust using seismic traveltime tomography. These show existence localized, 10–15 km Moho step runs parallel to coast. north–south...
Abstract The Nordland area in northern Norway is the seismically most active on mainland Fennoscandia. It exhibits patterns of coastal extension, which contrasts with first-order regional stress pattern that reflects compression aligned North Atlantic ridge push. field has been considered to emanate from interaction push and glacial isostatic adjustment; while local can be additionally influenced by gravitational, topographic stresses, as well flexural effects erosion sediment deposition. We...
Abstract To understand the major structural features of sedimentary cover and crystalline crust Lofoten‐Vesterålen margin northern part Vøring segment Mid‐Norwegian continental margin, a lithosphere‐scale 3‐D model has been constructed. This extends from exposed rocks Fennoscandian Shield in east to Cenozoic oceanic domain Norwegian‐Greenland Sea west, covering Vestfjorden, Ribban, Røst Basins parts Basin Trøndelag Platform. All available published and/or released data have used set initial...
In paper 1 we described a methodology to model coupled fluid flow and deformation in composite salt siliciclastic tectonic systems investigated their compaction overpressuring behavior prior during continental margin‐scale gravitational spreading. Compaction‐driven Darcy clastic sediments is through the effective pressure frictional‐plastic yield mechanical deformation. Viscous of underlying independent pressure. Paper presented prototype models that are limited single uniform sediment...
A methodology is presented to model coupled fluid flow and deformation in rifted continental margin composite salt siliciclastic tectonic systems; we investigate their compaction overpressuring behavior associated with margin‐scale gravitational spreading. Compaction‐driven Darcy clastic sediments through the effective pressure frictional‐plastic yielding mechanical deformation. Viscous of underlying independent pressure. Numerical models are adapted Oligo‐Miocene phase large‐scale failure...
Abstract Salt canopies are present in many of the worldwide large salt basins and key players basins' structural evolution as well development associated hydrocarbon systems. This study employs 2D finite‐element models which incorporate dynamical interaction viscous frictional‐plastic sediments a gravity‐spreading system. We investigate general emplacement that form centre large, autochthonous basin. is motivated by potential application to mid‐basin canopy NW Gulf Mexico (GoM) developed...
Abstract The distribution of Cenozoic compressional structures along the NW European margin has been compared with maps thickness crystalline crust derived from a compilation seismic refraction interpretations and gravity modelling, high-velocity lower and/or partially serpentinized upper mantle detected by experiments. Only subset mapped coincide areas susceptible to lithospheric weakening as result crustal hyperextension partial serpentinization mantle. Notably, is well documented beneath...
Abstract A channel‐like, low‐velocity zone in the lithospheric mantle beneath W Norway coincides spatially with extension of a recently discovered 200 × 50 km granite batholith, which formed as result oceanic subduction SW Fennoscandian margin between 1.07 and 1.01 Ga. Based on results from numerical modelling, we argue that zone, at least part, reflects thermal (radioactive) effects refertilized wedge this magmatic arc. The geological record Fennoscandia suggests active‐margin magmatism...
A prominent gravity and geoid low lies just south of the Lofoten peninsula in northern Norway, partly coinciding with location Proterozoic granites Transscandinavian Igneous Belt being offset by ca. 100 km to highest topography Norway. The study area extends both onshore offshore at transition between Archaean lithosphere. Palaeoproterozoic basement has been overthrusted Palaeozoic nappes Caledonian orogen now forms passive margin NE Atlantic. We investigate anomaly performing combined 3-D...
Abstract Isostasy is a well understood concept, yet rarely applied to its full capacity in regional interpretations of crustal structures. In this study, we utilize recent density model for the entire NE Atlantic, based on refraction seismic data and gravity inversion, calculate isostatically balanced bathymetry along mid-Norwegian margin. Since elevation are independent observables but both depend underlying model, consistencies discrepancies point towards deficits, erroneously interpreted...
The Mierojávri-Svaerholt shear