Whereas there is good agreement between most existing ages, the correlation of horizons between the Troll Field and the North Sea trough-mouth fan suggests that the sediments preserved at the base of the Norwegian Channel may have been deposited significantly later than assumed previously. We extend these horizons across large parts of the northern North Sea to establish a robust seismic framework that is used to assess the correspondence between existing chronostratigraphic ages. Here we use a large (35,000 km²) high-resolution 3D seismic cube, supplemented by other 2D and 3D seismic datasets, to map more than 20 horizons within the Quaternary Naust Formation. However, the general lack of chronological control on these sediments, combined with gaps in high-resolution seismic data coverage, has hindered our understanding of the detailed sediment infill history of this margin. The thick succession of Quaternary sediments that is preserved in the northern North Sea provides a valuable record of the climate and environmental changes of the last ∼2.6 million years. Possibly a postglacial collapse after the retreat of glaciers in the North Sea Basin, local lower crustal flow, or dynamic topography or a combination of these processes contributed to the residual subsidence. From the orientation and extent of the depocentre, lithosphere buckling and subsidence due to salt movement are considered unlikely. TheĮxtensive seismic dataset interpreted here makes it possible to exclude a phase of renewed tectonic activity as the origin of the subsidence anomaly. However, a certain portion of the subsidence needs additional processes to be invoked. Here we show that compaction and load-induced subsidence alone explain about 75% of the observed Quaternary subsidence. Previously, a number of mechanisms have been proposed to explain the Quaternary subsidence. This indicates extremely fast subsidence, with a rate of up to 480 m/Ma during the Quaternary, resulting in a NNW-SSE oriented sedimentary depocentre.ĭistinct iceberg scour marks, identified in 3D seismic data are used to calibrate quantitative subsidence analysis and to document shallow marine conditions during the Quaternary interglacials. An electromechanical device runs at the same rate regardless of changes in its drive force, so it maintains a constant frequency ( hz).3D and 2D seismic data reveal the base-reflection of the Quaternary in the northwestern German North Sea locally at depths of more than 1000 m. In dynamical system theory an oscillator is called isochronous if the frequency is independent of its amplitude.

The electromechanical oscillator was originally designed as a source of isochronous (that is to say, frequency stable), alternating electric current used with both wireless transmitting and receiving apparatus. Such predicted responses would-at least-take the form of induced electric and magnetic fields, telluric currents, and changes in earth conductivity. Additional non-mechanical responses to the initial acoustic impulses may also be detectable using instruments that measure various electrical and magnetic parameters. Data from reflected and refracted signals can be analyzed to deduce the location and characteristics of underground formations. Tesla designed this system for use in prospecting and discerning the location of underground mineral structures through the transmission of mechanical energy through the subsurface.

Flex2d geodynamics