%0 Conference Paper %1 ritzmann_etal:2006b %A Ritzmann, Oliver %A Maercklin, Nils %A Faleide, Jan I. %A Bungum, Hilmar %A Mooney, Walter D. %A Detweiler, Shane T. %B 28th Seismic Research Review: Ground-based nuclear explosion monitoring technologies %C Orlando, Florida %D 2006 %K geophysics myown seismics seismology %P 229--237 %T A 3D geophysical model of the crust in the Barents Sea region: Model construction and basement characterization %U http://www.ldeo.columbia.edu/res/pi/Monitoring/Doc/Srr_2006/PAPERS/01-25.PDF %X We here present BARENTS50, a new 3D geophysical model of the crust in the Barents Sea region. The target region of interest comprises northern Norway and Finland, parts of the Kola Peninsula and the East European lowlands. Novaya Zemlya, the Kara Sea and Franz-Josef Land terminate the region to the east, while the Norwegian-Greenland Sea marks the western boundary. In total, 680 one-dimensional seismic velocity profiles were compiled, mostly by sampling 2D seismic velocity transects, from seismic refraction profiles, every 25 km. Seismic reflection data in the western Barents Sea were further used for density modeling and subsequent density-to-velocity conversion. Velocities from these profiles were binned into two sedimentary and three crystalline crustal layers. The first step of the compilation comprised the layer-wise interpolation of the velocities and thicknesses. Within the different geological provinces of the study region, linear relationships between the thickness of the sedimentary rocks and the thickness of the remaining crystalline crust are observed. We therefore used the separately compiled (area-wide) sediment thickness data to adjust the crystalline crustal thickness according to the sedimentary thickness where no constraints from 1D velocity profiles existed. The BARENTS50 model is based on an equidistant hexagonal grid with a node spacing of 50 km. The P-wave velocity model was used for gravity modeling in order to obtain 3D density structure in the study region. A better fit to the observed gravity was achieved using a grid search algorithm which focused on the density contrast of the sediment-basement interface. The high resolution of 50 km is an improvement compared to older geophysical models.

@inproceedings{ritzmann_etal:2006b, abstract = {We here present BARENTS50, a new 3D geophysical model of the crust in the Barents Sea region. The target region of interest comprises northern Norway and Finland, parts of the Kola Peninsula and the East European lowlands. Novaya Zemlya, the Kara Sea and Franz-Josef Land terminate the region to the east, while the Norwegian-Greenland Sea marks the western boundary. In total, 680 one-dimensional seismic velocity profiles were compiled, mostly by sampling 2D seismic velocity transects, from seismic refraction profiles, every 25 km. Seismic reflection data in the western Barents Sea were further used for density modeling and subsequent density-to-velocity conversion. Velocities from these profiles were binned into two sedimentary and three crystalline crustal layers. The first step of the compilation comprised the layer-wise interpolation of the velocities and thicknesses. Within the different geological provinces of the study region, linear relationships between the thickness of the sedimentary rocks and the thickness of the remaining crystalline crust are observed. We therefore used the separately compiled (area-wide) sediment thickness data to adjust the crystalline crustal thickness according to the sedimentary thickness where no constraints from 1D velocity profiles existed. The BARENTS50 model is based on an equidistant hexagonal grid with a node spacing of 50 km. The P-wave velocity model was used for gravity modeling in order to obtain 3D density structure in the study region. A better fit to the observed gravity was achieved using a grid search algorithm which focused on the density contrast of the sediment-basement interface. The high resolution of 50 km is an improvement compared to older geophysical models.}, added-at = {2012-09-01T13:08:21.000+0200}, address = {Orlando, Florida}, author = {Ritzmann, Oliver and Maercklin, Nils and Faleide, Jan I. and Bungum, Hilmar and Mooney, Walter D. and Detweiler, Shane T.}, biburl = {https://www.bibsonomy.org/bibtex/28070f96fd7644d91e5faf2189d9cec28/nilsma}, booktitle = {28th Seismic Research Review: Ground-based nuclear explosion monitoring technologies}, interhash = {89bb622cc73648bc76f7133e7bdc6cfc}, intrahash = {8070f96fd7644d91e5faf2189d9cec28}, keywords = {geophysics myown seismics seismology}, month = sep, pages = {229--237}, timestamp = {2021-02-09T13:27:55.000+0100}, title = {A 3D geophysical model of the crust in the Barents Sea region: Model construction and basement characterization}, url = {http://www.ldeo.columbia.edu/res/pi/Monitoring/Doc/Srr_2006/PAPERS/01-25.PDF}, year = 2006 }