Browsing Department of Earth Science by Title
Now showing items 526-545 of 1006
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Machine learning and artificial neural networks for seismic processing
(Doctoral thesis, 2023-05-05)Nylig har tilgjengeligheten av kraftige GPUer og "open source"-programvare gjort det mulig for kunstige nevrale nettverk å løse flere praktiske og industrielle problemer. Vi kan bruke nevrale nettverk til viktige seismiske ... -
Magmatism at Passive Margins: Effects of Depth-Dependent Wide Rifting and Lithospheric Counterflow
(Journal article; Peer reviewed, 2022)Rifted passive margins exhibit a large variety in the timing, distribution, and amount of magmatism. The factors controlling magmatism during rifted margin formation, remain, however, incompletely understood, partly owing ... -
The Making of the NEAM Tsunami Hazard Model 2018 (NEAMTHM18)
(Journal article; Peer reviewed, 2021)The NEAM Tsunami Hazard Model 2018 (NEAMTHM18) is a probabilistic hazard model for tsunamis generated by earthquakes. It covers the coastlines of the North-eastern Atlantic, the Mediterranean, and connected seas (NEAM). ... -
Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones
(Journal article; Peer reviewed, 2022)The transition zone from continental crust to the mature mid-ocean ridge spreading center of the Iberia-Newfoundland magma-poor rifted margins is mostly composed of exhumed mantle characterized by highs and domes with ... -
Mapping Microbial Abundance and Prevalence to Changing Oxygen Concentration in Deep-Sea Sediments Using Machine Learning and Differential Abundance
(Journal article; Peer reviewed, 2022)Oxygen constitutes one of the strongest factors explaining microbial taxonomic variability in deep-sea sediments. However, deep-sea microbiome studies often lack the spatial resolution to study the oxygen gradient and ... -
Mapping of the Subglacial Topography of Folgefonna Ice Cap in Western Norway—Consequences for Ice Retreat Patterns and Hydrological Changes
(Journal article; Peer reviewed, 2022-06-13)Folgefonna consists of three ice caps which are rapidly retreating in response to warmer temperatures. The melting of Folgefonna has implications for meltwater drainage and hydropower production, as well as the potential ... -
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 ... -
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 ... -
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 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 ...