1 Strain Migration During Multiphase Extension, Stord Basin, Northern North Sea Rift
1 1 Strain migration during multiphase extension, Stord Basin, northern North Sea rift 2 3 Hamed Fazlikhani1, 2, Synne S. Aagotnes2, 3, Marte A. Refvem2, 4, James Hamilton-Wright5, 6, Rebecca 4 E. Bell5, Haakon Fossen2, 7, Robert L. Gawthorpe2, Christopher A-L. Jackson5, Atle Rotevatn2 5 6 1 GeoZentrum Nordbayern, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Schlossgartern 7 5, 91054 Erlangen, Germany 8 2Department of Earth Science, University of Bergen, PO Box 7800, 5020 Bergen, Norway 9 3Now at Petrolia NOCO AS, Espehaugen 32 B, 5258 Blomsterdalen - Norway 10 4Now at Equinor ASA, 5020 Bergen, Norway 11 5Basins Research Group (BRG), Department of Earth Science and Engineering, Imperial College, 12 Prince Consort Road, London SW7 2BP, UK 13 6Now at BP Exploration Operating Company Limited, Chertsey Road, Sunbury-on-Thames, Middlesex, 14 TW16 7LN, UK 15 7Natural History Collections, University of Bergen, PO Box 7800, 5020 Bergen, Norway 16 17 Abstract 18 In multirifted regions, rift-related strain varies along and across the basin during and between each 19 extensional event, and the location of maximum extension often differs between rift phases. Despite 20 having a general understanding of multiphase rift kinematics, it remains unclear why some parts of 21 the rift are abandoned, with strain accumulating in previously less deformed areas, and how seismic 22 and sub-seismic scale pre-existing structures influence fault and basin geometries. We study the Stord 23 Basin, northern North Sea, a location characterized by strain migration between two rift episodes. To 24 reveal and quantify the kinematics, we interpreted a dense grid of 2D seismic reflection profiles, 25 produced time-structure and isochore maps, collected quantitative fault kinematic data and 26 calculated the amount of extension (β-factor).
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