Search for dissertations about: "upper mantle"

Showing result 1 - 5 of 16 swedish dissertations containing the words upper mantle.

  1. 1. Analyses of Seismic Wave Conversion in the Crust and Upper Mantle beneath the Baltic Shield

    Author : Sverker Olsson; Roland Roberts; Hans Thybo; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Geophysics; converted waves; Moho; upper mantle; Baltic Shield; tomography; anisotropy; receiver function; Geofysik;

    Abstract : Teleseismic data recorded by broad-band seismic stations in the Swedish National Seismic Network (SNSN) have been used in a suite of studies of seismic wave conversion in order to assess the structure of the crust and upper mantle beneath the Baltic Shield. Signals of seismic waves converted between P and S at seismic discontinuities within the Earth carry information on the velocity contrast at the converting interface, on the depth of conversion and on P and S velocities above this depth. READ MORE

  2. 2. Strain quantifications in different tectonic scales using numerical modelling

    Author : Lukas Fuchs; Hemin Koyi; Susanne Buiter; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Deformation modelling; progressive and finite deformation; salt tectonics; down-built diapir; upper mantle; lithosphere-asthenosphere boundary; seismic anisotropy; plate-mantle de coupling; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

    Abstract : This thesis focuses on calculation of finite and progressive deformation in different tectonic scales using 2D numerical models with application to natural cases. Essentially, two major tectonic areas have been covered: a) salt tectonics and b) upper mantle deformation due to interaction between the lithosphere and asthenosphere. READ MORE

  3. 3. Recovering Moho parameters using gravimetric and seismic data

    Author : Majid Abrehdary; Lars E. Sjöberg; Mohammad Bagherbandi; Pavel Novák; KTH; []
    Keywords : crust; gravity; mantle; Moho depth; non-isostatic effect; residual isostatic topography; stripping; thermal state; Vening Meinesz-Moritz model; Geodesy and Geoinformatics; Geodesi och geoinformatik;

    Abstract : Isostasy is a key concept in geoscience to interpret the state of mass balance between the Earth’s crust and mantle. There are four well-known isostatic models: the classical models of Airy/Heiskanen (A/H), Pratt/Hayford (P/H), and Vening Meinesz (VM) and the modern model of Vening Meinesz-Moritz (VMM). READ MORE

  4. 4. Isotropic and Anisotropic P and S Velocities of the Baltic Shield Mantle : Results from Analyses of Teleseismic Body Waves

    Author : Tuna Eken; Roland Roberts; Uli Achauer; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; teleseismic tomography; mantle lithosphere; seismic anisotropy; teleseismic earthquakes; shear wave splitting; Earth sciences; Geovetenskap; Geophysics Specialized In Seismology; geofysik; med inriktning mot seismologi;

    Abstract : The upper mantle structure of Swedish part of Baltic Shield with its isotropic and anisotropic seismic velocity characteristics is investigated using telesesismic body waves (i.e. P waves and shear waves) recorded by the Swedish National Seismological Network (SNSN). READ MORE

  5. 5. Experimental investigation of hydrocarbon formation and transformation under Earth´s upper mantle conditions

    Author : Anton Kolesnikov; Vladimir Kutcherov; Bertil Sundqvist; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; theory of deep abiotic petroleum origin; natural gas; hydrocarbons; methane; ethane; graphite; hydrogen; high pressure; high temperature; CONAC; BARS; diamond anvil cell; Raman; X-ray; gas chromatography; Engineering mechanics; Teknisk mekanik;

    Abstract : The theory of the abyssal abiotic petroleum origin considers oil and natural gas to begenerated in the Earth’s upper mantle. Hydrocarbons migrate further through the deep faults into the Earth’s crust, where they can form oil and gas deposits in any kind of rock in any kind of structural position. READ MORE