11 resultater
This report gives specifications and requirements for geological seabed mapping in the offshore region. The work was initiated by needs in the MAREANO-programme to document procedures. The report summarizes the work flow from collected data, through processing and interpretation to final products available/published on web map services, e.g. www.mareano.no.
This guidebook was prepared for the Norwegian part (seven days) of Excursion no.
Åknes is known as the most hazardous rockslide area in Norway at present, and is among the most investigated rockslides in the world, representing an exceptional natural laboratory. This study focuses on structural geology on five zones to interpret and understand the geometry of the rockslide area. The interpretations are further used to build a geological model of the site.
I forbindelse med at Jernbaneverket planlegger ny jernbanetunnel mellom Holm og Nykirke i Vestfold, samt ny Holmestrand jernbanestasjon i fjell, har NGU logget fire brønner langs tunneltraséen. Hensikten med loggingen var å kartlegge oppsprekking og geologi for å få informasjon om fjellkvalitet. Det er logget med optisk og akustisk televiewer og målt resistivitet i fjell, seismisk hastighet, temperatur, ledningsevne i vann, og naturlig gammastråling.
Internasjonalt samarbeid, geologi: lUGS sekretariatet har spilt en meget sentral rolle i internasjonalt geofaglig nettverksarbeid og har bLa. bidratt til at land i den 3. verden har vært mer aktiv i lUGS. Sekretariatet har utført sitt internasjonale arbeid på en meget tilfredsstillende måte.
NGU's Airborne Gamma Ray Spectrometer system is used both for geological mapping, and for monitoring radioactive materials in the event of nuclear emergencies. Traditional methods of processing spectrometer data use channel windows around the radionuclides of interest; more advanced methods make use of the full spectra information.
This report gives an overview of Norwegian prospecting on anorthosites, with emphasis on the calcic types dominant in the Inner Sogn-Voss area of Western Norway. The high aluminium content of these large anorthosite bodies by the Sognefjord has made them the target of potential alternative sources for the aluminium-industry. In several phases during the last 90 years major Norwegian companies have done extensive geological investigations with this aim.
2D resistivity modelling was done in order to examine the imaging resolution of 4 different configurations for mapping of fracture zones in bedrock. The studied arrays include Dipole-dipole, Gradient, Pole-dipole and Wenner. A variety of geological models were tested and the imaging possibilities and limitations of the different arrays were analysed. Apart from imaging fracture zones with various depth, width, contrast and dip, some models for horizontal layers were also examined.
An international effort to compile Circum-Arctic geophysical and bedrock data has been conducted by several national agencies (Russia, Sweden, Finland, Denmark, USA, Canada, Germany and Norway). This project produced an atlas that comprise geological and geophysical digital maps at a scale of 1: 5 million for the Arctic region limited by the 60 degree North latitude.
The Geological Survey of Norway (NGU) was contacted by Nordland Mineral (T. Vrålstad) in May 2010 to evaluate the potential of economic rare-earth-element (REE: Ce-Lu, Y) and Zr-mineralisations and related Be-, U-, Th-, (W-) mineralisations in Proterozoic basement windows and overlying Caledonian nappe complexes in central and northern Nordland between Mo i Rana in the south and Ofotfjorden in the north.
A high-sensitivity aeromagnetic survey, BASAR-09, was carried out in an area of 106,300 km2 in the Norwegian Barents Sea. Data processing comprised spike-removal and data editing, systematic corrections, and statistical and micro-levelling. Processing and interpretation of the new dataset included a compilation and merger of the surveys in the entire Norwegian Barents Sea. Several potential field maps were produced from the survey area.