Essays about: "geofysik"

Showing result 16 - 20 of 66 essays containing the word geofysik.

  1. 16. Processing of Noisy Controlled Source Audio Magnetotelluric (CSAMT) Data

    University essay from Uppsala universitet/Geofysik

    Author : Julia Fridlund; [2019]
    Keywords : CSAMT; noise; magnetotelluric transfer functions; robust processing; transients; bias; CSAMT; brus; magnetotelluriska överföringsfunktioner; robust processering; transienter; bias;

    Abstract : Controlled Source Audio Magnetotellurics (CSAMT) is a geophysical method for characterizing the resistivity of the subsurface with the help of electromagnetic waves. The method is used for various purposes, such as geothermal- and hydrocarbon exploration, mineral prospecting and for investigation of groundwater resources. READ MORE

  3. 17. Data processing of Controlled Source Audio Magnetotelluric (CSAMT) Data

    University essay from Uppsala universitet/Geofysik

    Author : Oskar Rydman; [2019]
    Keywords : CSAMT; detrending; coherency; transients; time series; processing; CSAMT; detrending; koherens; transienter; tidserier; processering;

    Abstract : During this project three distinct methods to improve the data processing of Controlled Source Audio Magnetotellurics (CSAMT) data are implemented and their advantages and disadvantages are discussed. The methods in question are: Detrending the time series in the time domain, instead of detrending in the frequencydomain. READ MORE

  4. 18. Petrophysic of the Host-rock to the Ore in the Lovisa Mine, Bergslagen

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Oscar Gilljam Päärt; [2019]
    Keywords : Petrophysics; density; magnetic volume susceptibility; natural remanent magnetization; Bergslagen; lithology; Petrofysik; densitet; magnetisk susceptibilitet; naturlig magnetisk remanens; Bergslagen; lithologi;

    Abstract : The Bergslagen region has three base-metal mines operating today, and one of them is the Lovisa mine, which host a Zn-Pb-Ag deposit. The Lovisa mine is located in the Guldsmedshyttan area north of Lindesberg. READ MORE

  5. 19. Characterizing magnetic susceptibility and remanent magnetization of magnetite and hematite rich drill-core samples at Blötberget

    University essay from Uppsala universitet/Geofysik

    Author : Andreas Bjork; [2018]
    Keywords : Verwey; Morin; Curie; Néel; magnetite; hematite; alteration; iron-ore; quality control; kappabridge; hysteresis; susceptibility; anisotropy; Verwey; Morin; Curie; Néel; magnetit; hematit; oxidation; järnmalm; kvalitetskontroll; kappabridge; hysteresis; susceptibilitet; anisotropi;

    Abstract : Laboratory magnetic measurements are used to develop a methodology to characterize the Kiruna-type Rare Earth Elements (REE) bearing apatite iron-oxide deposits at Blötberget in central Sweden. This high-grade ore deposit is known to have sharp boundaries between lens shaped main ore bodies of magnetite-rich ore, and a complex hematite-rich ore associated with pegmatites and skarn formation. READ MORE

  6. 20. Resistivity and Seismic Characterization of an Embankment Dam. A Case Study in Northern Sweden

    University essay from Uppsala universitet/Geofysik

    Author : Álvaro Polín-Tornero; [2018]
    Keywords : embankment dam; Sweden; ERT; seismic refraction; seismic reflection; modelling; jordfyllningsdamm; Sverige; ERT; seismisk refraktion; seismisk reflektion; modellering;

    Abstract : The main cause of failure in embankment dams - which represent 75% of all dams in the world (ICOLD, 2018) - is the internal erosion produced by excessive seepage not accounted for in their designs. This erosion can cause that a small anomalous structure, not likely to be considered as risky, turns rapidly into a significant structural damage if not recognized on time. READ MORE