2-D and 3-D modelling of wide-angle seismic data: an example from the Voring volcanic passive margin

Type Article
Date 2006-09
Language English
Author(s) Rouzo Stephane1, Klingelhoefer FraukeORCID1, Jonquet Kolsto Hélène2, Karpuz Ridvan2, Kravik Karl3, Mjelde Rolf4, Murai Yoshio5, Raum Thomas4, Shimamura Hideki5, Williamson Paul6, Geli LouisORCID1
Affiliation(s) 1 : IFREMER, Dept Geodynam & Geophys, Plouzane, France.
2 : Total E&P Norge AS, Stavanger, Norway.
3 : Norsk Hydro AS, Bergen, Norway.
4 : Univ Bergen, Inst Solid Earth Phys, Bergen, Norway.
5 : Hokkaido Univ, Inst Seismol & Volcanol, Sapporo, Hokkaido, Japan.
6 : Total E&P PLCs Geosci Res Ctr, Aberdeen, Scotland.
Source Marine Geophysical Researches (0025-3235) (Springer), 2006-09 , Vol. 27 , N. 3 , P. 181-199
DOI 10.1007/s11001-006-0001-3
WOS© Times Cited 6
Keyword(s) Gravity modelling, 3 D modelling, Sub screen imaging, Wide angle seismic
Abstract This study presents the modelling of 2-D and 3-D wide-angle seismic data acquired on the complex, volcanic passive margin of the Voring Plateau, off Norway. Three wide-angle seismic profiles were shot and recorded simultaneously by 21 Ocean Bottom Seismometers, yielding a comprehensive 3-D data set, in addition to the three in-line profiles. Coincident multi-channel seismic profiles are used to better constrain the modelling, but the Mesozoic and deeper structures are poorly imaged due to the presence of flood basalts and sills. Velocity modelling reveals an unexpectedly large 30 km basement high hidden below the flood basalt. When interpreted as a 2-D structure, this basement high produces a modelled gravity anomaly in disagreement with the observed gravity. However, both the gravity and the seismic data suggest that the structure varies in all three directions. The modelling of the entire 3-D set of travel times leads to a coherent velocity structure that confirms the basement high; it also shows that the abrupt transition to the slower Cretaceous basin coincides in position and orientation with the fault system forming the Ran Ridge. The positive gravity anomaly over the Ran Ridge originates from the focussed and coincident elevation of the high velocity lower crust and pre-Cretaceous basement. Although the Moho is not constrained by the seismic data, the gravity modelled from the 3-D velocity model shows a better fit along the profiles. This study illustrates the interest of a 3-D acquisition of wide-angle seismic over complex structures and the benefit of the subsequent integrated interpretation of the seismic and gravity data.
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Rouzo Stephane, Klingelhoefer Frauke, Jonquet Kolsto Hélène, Karpuz Ridvan, Kravik Karl, Mjelde Rolf, Murai Yoshio, Raum Thomas, Shimamura Hideki, Williamson Paul, Geli Louis (2006). 2-D and 3-D modelling of wide-angle seismic data: an example from the Voring volcanic passive margin. Marine Geophysical Researches, 27(3), 181-199. Publisher's official version : https://doi.org/10.1007/s11001-006-0001-3 , Open Access version : https://archimer.ifremer.fr/doc/00000/2095/