Department of Earth Science
Nye registreringer
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Impacts of seismic resolution on fault interpretation: Insights from seismic modelling
(Journal article; Peer reviewed, 2021)Seismic mapping of subsurface faults is hampered by factors such as seismic resolution, velocity control for depth conversion and human bias. Here, we explore the challenges and pitfalls related to interpreting normal ... -
Point-spread function convolution to simulate prestack depth migrated images: A validation study
(Journal article; Peer reviewed, 2021)Seismic migration commonly yields an incomplete reconstruction of the Earth model due to restricted survey aperture, band-limited frequency content and propagation effects. This affects both illumination and resolution of ... -
Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland
(Journal article; Peer reviewed, 2021)Igneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of the magma transport system or have low resolution. In the Jameson Land Basin in East Greenland, seismic reflection ... -
Melt volume at Atlantic volcanic rifted margins controlled by depth-dependent extension and mantle temperature
(Journal article; Peer reviewed, 2021)Breakup volcanism along rifted passive margins is highly variable in time and space. The factors controlling magmatic activity during continental rifting and breakup are not resolved and controversial. Here we use numerical ... -
Syn-rift sediment gravity flow deposition on a Late Jurassic fault-terraced slope, northern North Sea
(Journal article; Peer reviewed, 2021)Structurally controlled bathymetry in rifts has a significant influence on sediment routing pathways and depositional architecture of sediment gravity flow deposits. In contrast to rift segments characterized by crustal-scale ... -
Assessing first-order BQART estimates for ancient source-to- sink mass budget calculations
(Journal article; Peer reviewed, 2021)Constraining the timing and volume of sediment dispersal in an ancient sedimentary system is vital to understand a basin's infill history. One preferred method for a first-order approximation of ancient sediment load ... -
Influence of Zones of Pre-Existing Crustal Weakness on Strain Localization and Partitioning During Rifting: Insights From Analog Modeling Using High-Resolution 3D Digital Image Correlation
(Journal article; Peer reviewed, 2021)Pre-existing crustal structures are known to influence rifting, but the factors controlling their influence remain poorly understood. We present results of digital image correlation that allows for the surface strain ... -
Seismic modelling and deconvolution of prestack depth migrated images through ray-based Point-Spread Functions
(Doctoral thesis, 2021-12-15)Seismic modelling involves simulating the propagation of waves through an Earth model to retrieve information about the subsurface. If an a priori Earth model is known, seismic modelling allows geoscientists to assess how ... -
Semi‐automatic Ice Rafted Debris quantification with Computed Tomography
(Journal article; Peer reviewed, 2021)Sedimentary ice-rafted debris (IRD) provides critical information about the climate sensitivity and dynamics of ice sheets. In recent decades, high-resolution investigations have revelated ice rafting events in response ... -
Deep-ocean circulation in the North Atlantic during the Plio-Pleistocene intensification of Northern Hemisphere Glaciation (~2.65–2.4 Ma)
(Journal article; Peer reviewed, 2021)Through transporting heat around the world and thereby regulating global climate, ocean circulation is an integral part of Earth's climate system that likely changed substantially on glacial-interglacial timescales in the ... -
Linking sediment supply variations and tectonic evolution in deep time, source-to-sink systems—The Triassic Greater Barents Sea Basin
(Journal article; Peer reviewed, 2021)Triassic strata in the Greater Barents Sea Basin are important records of geodynamic activity in the surrounding catchments and sediment transport in the Arctic basins. This study is the first attempt to investigate the ... -
The formation of the ophiolitic terrane of SW Norway - relationships between immature island arc volcanic sequences and trondhjemitic complexes on Bømlo
(Master thesis, 2021-10-01)Single zircon U/Pb dating, geochemistry, and field descriptions from trondhjemitic and tonalitic intrusions, intruding the Lykling Ophiolite Complex, provide new insights into the origin and evolution of the Early Ordovician ... -
Higher-order Hamilton–Jacobi perturbation theory for anisotropic heterogeneous media: dynamic ray tracing in ray-centred coordinates
(Journal article; Peer reviewed, 2021)Dynamic ray tracing is a robust and efficient method for computation of amplitude and phase attributes of the high-frequency Green’s function. A formulation of dynamic ray tracing in Cartesian coordinates was recently ... -
Late Quaternary dynamics of Arctic biota from ancient environmental genomics
(Journal article; Peer reviewed, 2021)During the last glacial–interglacial cycle, Arctic biotas experienced substantial climatic changes, yet the nature, extent and rate of their responses are not fully understood1,2,3,4,5,6,7,8. Here we report a large-scale ... -
Microstructure and fluid flow in the vicinity of basin bounding faults in rifts – The Dombjerg Fault, NE Greenland rift system
(Journal article; Peer reviewed, 2021)Faults commonly form loci for high fluid flux in sedimentary basins, where fluids, rocks and deformation processes frequently interact. Here, we elucidate the interaction of fluid flow, diagenesis and deformation near ... -
The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region
(Journal article; Peer reviewed, 2021)An earthquake sequence in the Storfjorden offshore area southwest of Spitsbergen in the Svalbard archipelago initiated with a 21 February 2008 magnitude Mw 6.1 event. This area had previously not produced any significant ... -
Homotopy scattering series for seismic forward modelling with variable density and velocity
(Journal article; Peer reviewed, 2021)We have derived a convergent scattering series solution for the frequency-domain wave equation in acoustic media with variable density and velocity. The convergent scattering series solution is based on the homotopy analysis ... -
Probabilistic Tsunami Hazard and Risk Analysis: A Review of Research Gaps
(Journal article; Peer reviewed, 2021)Tsunamis are unpredictable and infrequent but potentially large impact natural disasters. To prepare, mitigate and prevent losses from tsunamis, probabilistic hazard and risk analysis methods have been developed and have ... -
Improved seismic monitoring with OBS deployment in the Arctic: A pilot study from offshore western Svalbard
(Journal article; Peer reviewed, 2021)The mid‐ocean ridge system is the main source of earthquakes within the Arctic region. The earthquakes are recorded on the permanent land‐based stations in the region, although, smaller earthquakes remain undetected. In ... -
Teaching with digital geology in the high Arctic: opportunities and challenges
(Journal article; Peer reviewed, 2021)The Covid-19 pandemic occurred at a time of major revolution in the geosciences – the era of digital geology. Digital outcrop models (DOMs) acquired from consumer drones, processed using user-friendly photogrammetric ...
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