Search for dissertations about: "GRAVITY MODEL"

Showing result 11 - 15 of 163 swedish dissertations containing the words GRAVITY MODEL.

  1. 11. 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

  2. 12. Airborne Gravity Gradient, Magnetic and VLF datasets : Case studies of modelling, inversion and interpretation

    Author : Sayyed Mohammad Abtahi; Thomas Kalscheuer; Laust Pedersen; Jochen Kamm; Thorkild Rasmussen; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; VLF; gravity gradient; magnetic; airborne; inversion; non-uniqueness;

    Abstract : Northern Sweden is one of the largest hosts for mineral resources in Europe and always has been an interesting area for researchers from various disciplines of Earth sciences. This dissertation is a comprehensive summary of three case study papers on airborne VLF, gravity gradient and magnetic data in the area. READ MORE

  3. 13. Precise Gravimetric Geoid Model for Iran Based on GRACE and SRTM Data and the Least-Squares Modification of Stokes’ Formula : with Some Geodynamic Interpretations

    Author : Ramin Kiamehr; Lars Sjöberg; Martin Vermeer; KTH; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Gravity database; least-squares modification of Stokes; geoid determination; SRTM; GRACE; GPS levelling; density variation model; height datum; geodynamics; Iran; Earth sciences; Geovetenskap;

    Abstract : Iran is one of the most complicated areas in the world from the view of rough topography, tectonic activity, large lateral density and geoidal height variations. The computation of a regional gravimetric geoid model with high accuracy in mountainous regions, especially with sparse data, is a difficult task that needs a special attention to obtain reliable results which can meet the needs of the today geodetic community. READ MORE

  4. 14. On modelling of postglacial gravity change

    Author : Per-Anders Olsson; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; accurate predictions of the gravity change are important for e.g. reductions of geodetic observations to a reference epoch. During the last decade; Glacial isostatic adjustment GIA is the Earth s response to glacial-induced load variations on its surface. This phenomenon can today be observed in; contribute different and complemental information on the phenomenon. Knowledge of the gravitational component is important for understanding the underlying geodynamical processes. Further; such as vertical and horizontal deformation of the crust; efforts to observe the surface gravity change in Fennoscandia have been intensified and the observational accuracy successively improved. This offers new possibilities at the same time as it puts new demands on modelling. The purpose of this thesis is to study some aspects of the modelling of GIA-induced gravity change; North America and Fennoscandia. Different observables; relative sea level change and disturbances in the gravity field; for example;

    Abstract : Glacial isostatic adjustment (GIA) is the Earth's response to glacial-induced load variations on its surface. This phenomenon can today be observed in, for example, North America and Fennoscandia. READ MORE

  5. 15. An Isostatic Earth Crustal Model : and Its Applications

    Author : Mohammad Bagherbandi; Lars E. Sjöberg; Martinec Zdeněk; KTH; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Crustal thickness; inverse isostatic problem; isostasy; isostatic compensation; Moho depth; Moho density contrast; downward continuation; Earth sciences; Geovetenskap;

    Abstract :  The Mohorovičič discontinuity (Moho), which is the surface separating the Earth’s crust from the mantle, is of great interest among geoscientists. The Moho depth can be determined by seismic and gravimetric methods. READ MORE