Browsing Department of Earth Science by Title
Now showing items 696-715 of 1244
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A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982
(Peer reviewed; Journal article, 2003-03-12)Oxygen and carbon isotope records are presented for the benthic foraminifer Cibicidoides wuellerstorfi from upper middle through lower upper Miocene (11.6–8.2 Ma) sediments recovered at intermediate water depth (1134 m) ... -
Modeling and Inversion of CSEM Data using Green's Function Methods
(Master thesis, 2014-06-01)The aim of the present study is to develop new approximations to the integral equation for 3D Controlled Source Electromagnetic (CSEM) synthetic data. Several scattering approximations to the integral equation have previously ... -
Modeling and inversion of seismic data using multiple scattering, renormalization and homotopy methods
(Doctoral thesis, 2020-05-14)Seismic scattering theory plays an important role in seismic forward modeling and is the theoretical foundation for various seismic imaging methods. Full waveform inversion is a powerful technique for obtaining a high-resolution ... -
Modeling compaction effects on the elastic properties of clay-water composites
(Peer reviewed; Journal article, 2012-09)Modeling the elastic properties of clay-bearing rocks (shales) requires thorough knowledge of the mineral constituents, their elastic properties, pore space microstructure, and orientations of clay platelets. Information ... -
Modeling the Greenland englacial stratigraphy
(Journal article; Peer reviewed, 2021)Radar reflections from the interior of the Greenland ice sheet contain a comprehensive archive of past accumulation rates, ice dynamics, and basal melting. Combining these data with dynamic ice sheet models may greatly aid ... -
Modelling and inversion of time-lapse seismic data using scattering theory
(Master thesis, 2015-06-01)Waveform inversion methods can be used to obtain high-resolution images of the elastic and acoustic property changes of petroleum reservoirs under production, but remains computationally challenging. Efficient approximations ... -
Modelling and processing of flexural wave noise in sea ice
(Master thesis, 2016-04-12)One of the most common problems with seismic data obtained on sea ice is the presence of flexural ice wave noise on the seismic raw data. Flexural wave noise occurs on seismic data acquired on ice in the so-called transition ... -
Modelling illumination and resolution effects in seismic with a 2(3)D convolution method
(Master thesis, 2018-12-14)The aim of seismic modelling is to generate modelling cases with the highest degree of realism possible, where the benchmark is the expensive (expertise needed, extensive time-cost) finite-difference modelling method. A ... -
Modelling of an OBS profile across Storfjorden, Svalbard
(Master thesis, 2017-12-16)In this thesis, seismograms from eight Ocean Bottom Seismometers (OBS) have been processed, interpreted and used to obtain a 2D velocity model of a crustal transect across Storfjorden south of Svalbard through forward/inverse ... -
Modelling of OBS Data Across the Vestbakken Volcanic Province
(Master thesis, 2011)A P-Wave model of a 384 km long Ocean Bottom Seismometer profile has been modelled by use of ray-tracing. The profile, Bear Island South (BIS-2008), crossses the transtensional Vestbakken Volcanic Province and the boundary ... -
Modelling temporal changes in the gravity field in the Nankai Trough Subduction Zone, Japan
(Master thesis, 2019-12-20)The Nankai trough subduction zone off southwest Japan is prone to large earthquakes, causing tsunamis and great damages to the nearby islands. Linking the sources of these earthquakes to asperities along the plate interface ... -
A Modelling Workflow for Seismic Characterization of Paleokarst Reservoirs
(Master thesis, 2018-12-14)Karst is a type of landscape formed by dissolution of soluble rocks such as carbonates. Caves are common subsurface karst features and develop where water percolates through the host rock and creates cave-passages through ... -
The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway
(Journal article; Peer reviewed, 2023)The crustal structure of the Nordland and Troms region, Norway, has received growing scientific attention because (a) the region is one of the most seismically active areas of mainland Norway, and (b) there are differing ... -
Monitoring glacial lake outburst flood susceptibility using Sentinel-1 SAR data, Google Earth Engine, and persistent scatterer interferometry
(Journal article; Peer reviewed, 2022)Continuous monitoring of glacial lakes, their parent glaciers and their surroundings is crucial because possible outbursts of these lakes pose a serious hazard to downstream areas. Ongoing climate change increases the risk ... -
Morphology and life history divergence in cave and surface populations of Gammarus lacustris (L.)
(Peer reviewed; Journal article, 2018-10-25)Cave animals provide a unique opportunity to study contrasts in phenotype and life history in strikingly different environments when compared to surface populations, potentially related to natural selection. As such, we ... -
Morphotectonic Evolution of Passive Margins Undergoing Active Surface Processes: Large-Scale Experiments Using Numerical Models
(Journal article; Peer reviewed, 2020)Extension of the continental lithosphere can lead to the formation of rifted margins with contrasting tectonic and geomorphologic characteristics. Many of these characteristics depend on the manner extension spatially ... -
Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean
(Journal article; Peer reviewed, 2021)The narrow Morris Jesup Spur and an adjacent broader western rise extend 220 km into the Eurasia Basin from the shelf edge north of Greenland. We have used a hovercraft platform drifting with the sea to collect the first ... -
Mountain Building or Backarc Extension in Ocean-Continent Subduction Systems: A Function of Backarc Lithospheric Strength and Absolute Plate Velocities
(Journal article; Peer reviewed, 2019)The crustal structure of overriding plates in subduction settings around the world varies between a wide range of deformation styles, ranging from extensional structures and backarc opening as in the Tonga or Hellenic ... -
Mudstone-rich fluvial systems as reservoirs: The Brushy Basin Member of the Morrison Formation, Eastern Utah
(Master thesis, 2018-09-27)Mudstone-rich fluvial systems are common in the sedimentary record, such as the Triassic of the Barents Sea, but have received little scientific attention compared to their sandstonerich counterparts. However, mudstone-rich ... -
A multi-model CMIP6-PMIP4 study of Arctic sea ice at 127 ka: sea ice data compilation and model differences
(Journal article; Peer reviewed, 2021)The Last Interglacial period (LIG) is a period with increased summer insolation at high northern latitudes, which results in strong changes in the terrestrial and marine cryosphere. Understanding the mechanisms for this ...