FN Archimer Export Format
PT J
TI 2-D and 3-D modelling of wide-angle seismic data: an example from the Voring volcanic passive margin
BT 
AF ROUZO, Stephane
   KLINGELHOEFER, Frauke
   JONQUET KOLSTO, Hélène
   KARPUZ, Ridvan
   KRAVIK, Karl
   MJELDE, Rolf
   MURAI, Yoshio
   RAUM, Thomas
   SHIMAMURA, Hideki
   WILLIAMSON, Paul
   GELI, Louis
AS 1:1;2:1;3:2;4:2;5:3;6:4;7:5;8:4;9:5;10:6;11:1;
FF 1:PDG-DOP-DCB-GM-LGG;2:PDG-DOP-DCB-GM-LGG;3:;4:;5:;6:;7:;8:;9:;10:;11:PDG-DOP-DCB-GM-LGG;
C1 IFREMER, Dept Geodynam & Geophys, Plouzane, France.
   Total E&P Norge AS, Stavanger, Norway.
   Norsk Hydro AS, Bergen, Norway.
   Univ Bergen, Inst Solid Earth Phys, Bergen, Norway.
   Hokkaido Univ, Inst Seismol & Volcanol, Sapporo, Hokkaido, Japan.
   Total E&P PLCs Geosci Res Ctr, Aberdeen, Scotland.
C2 IFREMER, FRANCE
   TOTAL SA, NORWAY
   NORSK HYDRO AS, NORWAY
   UNIV BERGEN, NORWAY
   UNIV HOKKAIDO, JAPAN
   TOTAL SA, UK
SI BREST
SE PDG-DOP-DCB-GM-LGG
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-int-hors-europe
IF 0.714
TC 6
UR https://archimer.ifremer.fr/doc/2006/publication-2095.pdf
LA English
DT Article
DE ;Gravity modelling;3 D modelling;Sub screen imaging;Wide angle seismic
AB 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.
PY 2006
PD SEP
SO Marine Geophysical Researches
SN 0025-3235
PU Springer
VL 27
IS 3
UT 000242157100003
BP 181
EP 199
DI 10.1007/s11001-006-0001-3
ID 2095
ER

EF