Diffractions can provide information about small scale heterogeneities. However, in many cases, the diffracted energy is masked by the stronger reflections. Thus, techniques for separating diffractions from reflections are ...

Oxia Planum is the chosen landing site for the ExoMars2022 rover that launches between August and October 2022. The nominal mission is one Mars year, and the goal is to look for signs of past or present life on Mars. The ...

The P-Receiver functions(RFs) at 8 temporary seismic stations named KONO1 to KONO8, located in a 100x100 km region around Kongsberg (Norway) are analysed in this thesis. RFs use S converted waves arriving at the seismological ...

Impact craters are a common geological feature found on a variety of planetary bodies throughout the Solar System and can reveal information about the history of the Solar System and its planets. Specifically, crater ...

Potential field analysis is known to suffer from the problem of "non-uniqueness" in solutions. Gravity data interpretation is a prime example. Anomalous bodies can be detected from the gravity field, but information regarding ...

The aim of this thesis has been to look at the possibility of using a convolutional neural network to attenuate seismic interference (SI) noise in marine seismic data. Modern SI-denoising algorithms employed by the industry ...

Transform faults are strike-slip faults that accommodate lateral offsets between spreading segments of mid-ocean ridges. Because plates cannot move perpendicular to them, transform faults may exert a control on plate motions ...

Despite its similarities in bulk properties to Earth, Venus portrays a fundamentally different mode of surface tectonics. Venus is currently known to be operating in stagnant lid mode of mantle convection. However, it is ...

The effects of pore pressure and fluid saturation on the seismic velocity changes are coupled and important to discriminate one from the other in the context of time-lapse monitoring of fluid injection into the subsurface ...

The traditional airgun source has for a long time been the preferred type of source in marine seismic data acquisition due to its high impulsive pressure output. However, this impulsive energy has recently been of concern ...

Recent studies show that the noise recorded by seismic sensors can be used to characterize the seismic structure in the area where the sensors are located. This is called ambient noise tomography. In this thesis, data from ...

The principles of signals from vibrators have been investigated over half a century, however such sources are rarely applied in a marine environment. The objective of this thesis is to study the modeling of the pressure ...

Airborne electromagnetics (AEM) is a geophysical investigation method used to make resistivity models of the subsurface, for ground investigations related to various types of projects. It was originally developed as an ...

Several studies have been conducted since last 50 years to understand the crustal architecture of the passive margins. The conjugate passive margins along Indian Ocean are very less surveyed and studied due to geographical ...

This thesis is an investigation of currents in the outer Oslofjord using available tools. Current records and output from the NorKyst-800 model are examined and compared using statistical methods. Internal tidal waves are ...

The Horda Platform area, in the Norwegian North Sea, has a complex burial history, including rifting and fault block rotation followed by uplift end subsequent erosion. These processes have affected the elastic properties ...

On geological time scales, the global ocean circulation is controlled by changes in paleobathymetry, including opening and closure of strategic ocean gateways and formation of new ocean basins. In the Cenozoic time (65 - ...

In this this study, receiver function analysis of the crust underneath TROLL seismic station in Queen Maud Land, Antarctica was performed. An analysis of the neighboring seismic station SNAA was carried out as well to ...

This study is a small part of ongoing research for CO2 sequestration at Longyearbyen CO2 Storage Lab, Svalbard, Norway. The primary aim of this study is to determine geomechanical properties of two important caprock units ...

The glacier calving process is poorly documented but closely related to glacier dynamics. Glaciers respond to many factors, such as air temperature or precipitation and can affect calving activity. Accessing calving rate ...

This master thesis in Geophysics is about detecting and attenuating seismic interference noise. The thesis is written in collaboration with the Marine R&D Department at CGG and Department of Geosciences at the University ...

The aim of this work was to compare various dip estimation methods and apply the best of them to identify the dip of seismic interference noise (SI) in the shot domain. Four dip estimation methods were considered: correlation ...

The Eggvin Bank is a shallow area located on the northern segment of Kolbeinsey Ridge. Its crustal structure was investigated along a 301 km long transect from the Greenland Basin to the Iceland Plateau, crossing over the ...

The purpose of this study is to improve the basic understanding of the propagating mechanisms behind seismic interference noise. A Matlab code of the normal mode solution in Pekeris waveguide model was developed and numerical ...

The main focus of this thesis work has been diffractions and their associated multiples in marine seismic. Since diffraction carry useful information about small scale inhomogeneities in general, techniques able to enhance ...

Two wide angle 3-Compnent Ocean Bottom Seismometer (OBS) profiles along with associated Land-Stations acquired during 2003 under the EUROMARGINS Program were analyzed during this M.Sc. Thesis. These profiles are named as ...

Marine Seismic Interference (SI) occurs when several seismic vessels operate in close proximity, and the interfering energy from one vessel is recorded as interfering noise by another. Generally, SI is removed by various ...

In this thesis a new approach, called THEAMTM, is presented. The THEAMTM methodology is a non-invasive tunnel health monitoring method using active seismic. The method incorporates geophysical seismic analysis methods and ...

Shooting in an overlapping fashion is called blended or simultaneous acquisition. This can make acquisition efficient and economical. However, deblending (i.e. the process of separating the blended data) of data can be ...

Scandinavian Mountain Range is located at the continental margin of the Eurasian plate. This area is part of the Baltic shield so topography is expected to be generally low. But this is not the case here. In South western ...

The impact of earthquakes, due to ground shaking, which affects the whole tunnel length from ovaling of the tunnel cross section, is investigated in this thesis. The influence of rock mass quality Q and the tunnel dimension ...

Abstract Seismic time migration is a cost and time effective process for imaging of the subsurface. However, the approach is traditionally limited to velocity models with mildly varying lateral variations. The objective ...

This thesis investigates the application of the Empirical Mode Decomposition (EMD) and Ensemble Empirical Mode Decomposition (EEMD) techniques in de-noising of marine seismic data. EMD decomposes the seismic dataset into ...

In a 3D marine survey, often large areas of poor coverage (‘coverage holes’) exist caused by feathering during the actual acquisition. Infill management is introduced to fill those ‘coverage holes’, but a high percentage ...

I denne oppgaven undersøker vi variasjoner i temperatur og tetthet i litosfæren i Sør Norge og diskuterer de mulige tektoniske betydningene av disse. I den første delen videreutvikles en metode som beregner temperatur og ...

The aim of this thesis is to investigate and gain better understanding of a new modeling technique called modeling by demigration. Demigration itself can be defined as the inverse of true amplitude migration. This involves ...

Marin seismic acquisition results in signals that are affected by both random and coherent noise. For successful imaging it is important that as much as possible of this noise is attenuated in an early stage of processing. ...

Sea surface profile and reflection coefficient estimates are vital input parameters to various seismic data processing applications. The common assumption of a flat sea surface when processing seismic data can lead to ...

In this thesis we present a three-dimensional (3-D) seismic SV-wave speed model for the upper mantle beneath Northern Europe derived from the analysis of fundamental mode Rayleigh waveforms. Selecting recordings with ...

Magma transport through the Earth’s crust often ends in sedimentary basins. While it erupts at the surface, a significant part of the magma emplaces in depth in the basin forming sheet complexes dominated by horizontal ...

Sammendrag På Åknes i Møre og Romsdal, Norge, er det i dalsiden av en fjord oppdaget et potensielt fjellskred. Et ras på Åknes kan lage en enorm flodbølge nede i fjorden. Denne flodbølgen vil ødelegge de nærmeste bygdene ...