Browsing Department of Earth Science by Title
Now showing items 570-589 of 1076
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Mapping sediment–landform assemblages to constrain lacustrine sedimentation in a glacier-fed lake catchment in northwest Spitsbergen
(Peer reviewed; Journal article, 2015-10-24)Changes in the deposition of fine-grained rock-flour in glacier-fed lakes reflect glacier variability. This meltwater-driven signal is, however, often overprinted by other processes. To constrain the signature of lacustrine ... -
Mass balance and hydrological modeling of the Hardangerjøkulen ice cap in south-central Norway
(Journal article; Peer reviewed, 2021)A detailed, physically based, one dimensional column snowpack model (Crocus) has been incorporated into the hydrological model, Weather Research and Forecasting (WRF)-Hydro, to allow for direct surface mass balance simulation ... -
A matrix-free variant of the distorted Born iterative method for seismic full-waveform inversion
(Journal article; Peer reviewed, 2023)The distorted Born iterative method reduces a nonlinear inverse scattering problem to a sequence of (ill-posed) linear inverse scattering problems that can be solved using a regularized least-squares formulation. This ... -
Measured and modeled acoustic propagation underneath the rough Arctic sea-ice
(Peer reviewed; Journal article, 2017-09)A characteristic surface duct beneath the sea-ice in the Marginal Ice Zone causes acoustic waves to be trapped and continuously interact with the sea-ice. The reflectivity of the sea-ice depends on the thickness, the elastic ... -
Measuring seismic station timing errors from ambient noise
(Master thesis, 2018)Cross correlations of ambient seismic noise recorded at two stations can be used to estimate the Green’s function between these two stations. Since seismic stations are continuously recoding seismic noise, the Green’s ... -
Mechanical properties of selected granitoids along the Karora hydropower project, Besham, Northern Pakistan: Insights from petrography and joint analysis
(Journal article; Peer reviewed, 2023)The stability of tunnel site depends upon the deformation behaviors of the surrounding rocks, including joint density, mineral composition, micro cracks, and grain boundaries. The aim of this study was to analyze the ... -
Mechanism of solid-state clumped isotope reordering in carbonate minerals from aragonite heating experiments
(Journal article; Peer reviewed, 2019-08-01)The clumped isotope compositions of carbonate minerals are subject to alteration at elevated temperatures. Understanding the mechanism of solid-state reordering in carbonate minerals is important in our interpretations of ... -
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 ... -
Meltwater sediment transport as the dominating process in mid-latitude trough mouth fan formation
(Journal article; Peer reviewed, 2020)Trough mouth fans comprise the largest sediment deposits along glaciated margins, and record Pleistocene climate changes on a multi-decadal time scale. Here we present a model for the formation of the North Sea Fan derived ... -
Mesoproterozoic to Early Devonian Evolution of the Lyderhorn Gneiss (Øygarden Complex, SW Norway) - Constraints from Field Mapping and U-Pb Zircon Geochronology
(Master thesis, 2016-05-31)The Øygarden Complex and the Bergen Arc System are intriguing large-scale structures in the SW Norwegian Caledonides, but their formation is still incompletely understood. So far, the lack of published U-Pb zircon ages has ... -
Mesozoic-Cenozoic regional stress field evolution in Svalbard
(Journal article; Peer reviewed, 2020)Cooling fracture orientations in diabase sills associated with the Cretaceous High Arctic Large Igneous Province and syn‐sedimentary Triassic faults help constrain a model for Svalbard's (NE Barents Shelf) Mesozoic stress ... -
A method for generating volumetric fault zone grids for pillar gridded reservoir models
(Peer reviewed; Journal article, 2015-08)The internal structure and petrophysical property distribution of fault zones are commonly exceedingly complex compared to the surrounding host rock from which they are derived. This in turn produces highly complex fluid ... -
Methods for improved prediction of elastic, electrical and reservoir properties
(Doctoral thesis, 2011-10-24)This thesis is submitted for the Philosophiae Doctor degree in Petroleum Geosciences at the Department of Earth Science, University of Bergen. Financial support for this study has been provided by the Research Council of ... -
Metodar for demping av fleksurbølgjer i havis
(Master thesis, 2015-03-23)Seismiske innsamlingar på flytande havis gir under visse forhold opphav til kjeldeinduserte fleksurbølgjer (Sunwall et al., 2012). Desse oppstår kor seismisk energi blir fanga mellom grenseflatene is/luft og is/vatn. ... -
Microbial community structure in Arctic lake sediments reflect variations in Holocene climate conditions
(Journal article; Peer reviewed, 2020)The reconstruction of past climate variability using physical and geochemical parameters from lake sedimentary records is a well-established and widely used approach. These geological records are also known to contain large ... -
Microseismic wavefield modelling in anisotropic elastic media using integral equation method
(Journal article; Peer reviewed, 2023)In this paper, we present a frequency-domain volume integral method to model the microseismic wavefield in heterogeneous anisotropic-elastic media. The elastic wave equation is written as an integral equation of the ... -
Microseismic Waveform Modeling and Inversion using Finite-Difference and Global Optimization
(Master thesis, 2023-06-01)Estimating microseismic source parameters is an essential part of a microseismic monitoring project. Typically the microseismic source position and origin time are estimated utilizing kinematic methods, while the moment ... -
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 ... -
Mid-Pliocene Atlantic Meridional Overturning Circulation simulated in PlioMIP2
(Journal article; Peer reviewed, 2021)In the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2), coupled climate models have been used to simulate an interglacial climate during the mid-Piacenzian warm period (mPWP; 3.264 to 3.025 Ma). Here, we compare ... -
Mid-Pliocene West African Monsoon rainfall as simulated in the PlioMIP2 ensemble
(Journal article; Peer reviewed, 2021)The mid-Pliocene warm period (mPWP; ∼3.2 million years ago) is seen as the most recent time period characterized by a warm climate state, with similar to modern geography and ∼400 ppmv atmospheric CO2 concentration, and ...