scholarly journals Assemblage of buried and seabed tunnel valleys in the central North Sea: from morphology to ice-sheet dynamics

2016 ◽  
Vol 46 (1) ◽  
pp. 317-320 ◽  
Author(s):  
M. A. Stewart
Keyword(s):  
North Sea ◽  
Ice Sheet ◽  
Ice Sheet Dynamics ◽  
Central North Sea

scholarly journals Evidence for a grounded ice sheet in the central North Sea during the early Middle Pleistocene Donian Glaciation

2017 ◽  
Vol 175 (2) ◽  
pp. 291-307 ◽  
Author(s):  
Carina Bendixen ◽  
Rachel M. Lamb ◽  
Mads Huuse ◽  
Lars O. Boldreel ◽  
Jørn B. Jensen ◽  
...  
Keyword(s):  
North Sea ◽  
Ice Sheet ◽  
Middle Pleistocene ◽  
Central North Sea

scholarly journals Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains

2015 ◽  
Vol 121 ◽  
pp. 36-51 ◽  
Author(s):  
Aage Paus ◽  
Sanne Boessenkool ◽  
Christian Brochmann ◽  
Laura Saskia Epp ◽  
Derek Fabel ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Early Holocene ◽  
Ice Sheet Dynamics

A new parameter set for anisotropic multiparameter full-waveform inversion and application to a North Sea data set

Geophysics ◽  
2016 ◽  
Vol 81 (4) ◽  
pp. U25-U38 ◽  
Author(s):  
Nuno V. da Silva ◽  
Andrew Ratcliffe ◽  
Vetle Vinje ◽  
Graham Conroy
Keyword(s):  
North Sea ◽  
Waveform Inversion ◽  
Real Data ◽  
Model Parameters ◽  
Full Waveform Inversion ◽  
Radiation Patterns ◽  
Data Set ◽  
Full Waveform ◽  
Seismic Image ◽  
Central North Sea

Parameterization lies at the center of anisotropic full-waveform inversion (FWI) with multiparameter updates. This is because FWI aims to update the long and short wavelengths of the perturbations. Thus, it is important that the parameterization accommodates this. Recently, there has been an intensive effort to determine the optimal parameterization, centering the fundamental discussion mainly on the analysis of radiation patterns for each one of these parameterizations, and aiming to determine which is best suited for multiparameter inversion. We have developed a new parameterization in the scope of FWI, based on the concept of kinematically equivalent media, as originally proposed in other areas of seismic data analysis. Our analysis is also based on radiation patterns, as well as the relation between the perturbation of this set of parameters and perturbation in traveltime. The radiation pattern reveals that this parameterization combines some of the characteristics of parameterizations with one velocity and two Thomsen’s parameters and parameterizations using two velocities and one Thomsen’s parameter. The study of perturbation of traveltime with perturbation of model parameters shows that the new parameterization is less ambiguous when relating these quantities in comparison with other more commonly used parameterizations. We have concluded that our new parameterization is well-suited for inverting diving waves, which are of paramount importance to carry out practical FWI successfully. We have demonstrated that the new parameterization produces good inversion results with synthetic and real data examples. In the latter case of the real data example from the Central North Sea, the inverted models show good agreement with the geologic structures, leading to an improvement of the seismic image and flatness of the common image gathers.

Triassic-age salt tectonics of the Central North Sea

2014 ◽  
Vol 2 (4) ◽  
pp. SM19-SM28 ◽  
Author(s):  
John F. Karlo ◽  
Frans S. P. van Buchem ◽  
Jan Moen ◽  
Katie Milroy
Keyword(s):  
North Sea ◽  
Lateral Displacement ◽  
Salt Tectonics ◽  
Structural Relief ◽  
Tectonic Style ◽  
Thermal Doming ◽  
Central North Sea ◽  
Extensional Structures

The framework of salt tectonics in the Central North Sea was set early in the Triassic. We defined and illustrated five major domains of differing salt tectonic style. The differing structural styles were all interpreted as having evolved under a component of lateral displacement pairing extensional and contractional structures, produced by some combination of decoupled rift extension and gravity sliding. However, the extensional structures are located toward the basin center and the contractional structures near the original updip limits of salt. This suggests a framework driven by gravity sliding of the sediments overlying the Zechstein away from the Central Graben. Possible mechanisms for structural relief away from the Central Graben are the Triassic focus of rifting lying further east at the Norwegian-Danish basin, footwall uplift of a Triassic Central Graben precursor and significant thermal doming occurring much earlier than had previously been thought. The mechanisms are not mutually exclusive and may have acted in concert.

scholarly journals The North Sea Ice Sheet

Nature ◽  
1894 ◽  
Vol 50 (1282) ◽  
pp. 79-79
Author(s):  
HENRY H. HOWORTH
Keyword(s):  
Sea Ice ◽  
North Sea ◽  
Ice Sheet ◽  
The North ◽  
The North Sea
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