Sökning: "Geofysik"

Visar resultat 1 - 5 av 162 avhandlingar innehållade ordet Geofysik.

  1. 1. Seismic imaging of deep crustal reflectivity in Sweden and Iceland

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Niklas Juhojuntti; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; seismic; reflectivity; Moho; crust; signal; Geofysik; NATURAL SCIENCES Physics Other physics Geophysics; NATURVETENSKAP Fysik Övrig fysik Geofysik; Geofysik med inriktning mot seismologi; Geophysics with specialization in Seismology;

    Sammanfattning : Seismic reflection profiling, originally developed by the petroleum industry, was adapted to systematic imaging of deep structures some 25 years ago. In continental areas, these measurements often show weakly reflective upper crust and strongly reflective lower crust. LÄS MER

  2. 2. Prediction of Strong Ground Motion and Hazard Uncertainties

    Detta är en avhandling från Uppsala : Universitetsbiblioteket

    Författare :Behrooz Tavakoli; Ota Kulhanek; Dieter Mayer-Rosa; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; Disaggregation; Ground motion; Monte Carlo simulation; Seismic hazard; Geofysik; NATURAL SCIENCES Physics Other physics Geophysics; NATURVETENSKAP Fysik Övrig fysik Geofysik; Geofysik med inriktning mot seismologi; Geophysics with specialization in Seismology;

    Sammanfattning : The purpose of this thesis is to provide a detailed description of recent methods and scientific basis for characterizing earthquake sources within a certain region with distinct tectonic environments. The focus will be on those characteristics that are most significant to the ground-shaking hazard and on how we can incorporate our current knowledge into hazard analyses for engineering design purposes. LÄS MER

  3. 3. Plane wave electromagnetic measurements for imaging fracture zones

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Lena Persson; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; Electromagnetic Measurements Fracture Zones; Geofysik; NATURAL SCIENCES Physics Other physics Geophysics; NATURVETENSKAP Fysik Övrig fysik Geofysik; Geofysik med inriktning mot fasta jordens fysik; Geophysics with specialization in Solid Earth Physics;

    Sammanfattning : Electromagnetic fields from distant radio transmitters interact with the resistivity structures in the earth. They can be regarded as plane-wave fields since their penetration depth is much smaller than their wavelength. LÄS MER

  4. 4. EnviroMT : A new controlled source/radio magnetotoelluric system

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Mehrdad Bastani; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; EnviroMT; RMT; CSTMT; Geofysik; NATURAL SCIENCES Physics Other physics Geophysics; NATURVETENSKAP Fysik Övrig fysik Geofysik;

    Sammanfattning : In the frame of an EU project, a new electromagnetic prospecting instrument was designed and constructed for environmental and engineering applications. The instrument works in the frequency domain in the band 1-250 kHz, whereby the collected data can be used to study the variation of ground resistivity from the surface to a maximum depth of few hundred meters. LÄS MER

  5. 5. High-Resolution Seismics Methods Applied to Till Covered Hard Rock Environments

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Björn Bergman; Christopher Juhlin; Laust Börsting Pedersen; Ari Tryggvason; Ramon Carbonell; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; High-Resolution; Reflection Seismics; Tomography; Nuclear waste repository; Bedrock; Sediments; Geofysik; NATURAL SCIENCES Physics Other physics Geophysics; NATURVETENSKAP Fysik Övrig fysik Geofysik;

    Sammanfattning : Reflection seismic and seismic tomography methods can be used to image the upper kilometer of hard bedrock and the loose unconsolidated sediments covering it. Developments of these two methods and their application, as well as identifying issues concerning their usage, are the main focus of the thesis. LÄS MER