DFG SPP-1135

Recent movement potentials in Schleswig-Holstein (Northern Germany)

The development of the Northwest German basin and its modern surface topography is influenced by a high number of endogenic and exogenic processes, i.e. tectonics, volcanism, diapirism, ice shields, Elsterian tunnel valleys and the deposition of Quaternary sediments. In order to investigate connections between deep tectonic and halokinetic structures (Fig.1) and the development of recent topography, quantification of recent movement potentials was carried out for the area of Schleswig-Holstein (Germany) in consideration of the following parameter:

to the "Geotektonischer Atlas von NW-Deutschland" and surface topography of Schleswig-Holstein (Fig.2). The results show appearance of recent movement potential that mainly is caused by tectonic faults and salt structures. Thus recent movement potential mainly is given within the area of the Glückstadt-Trough. Highest movement potentials are concentrated in five areas, i.e. the areas Sterup, Schwarzenbek, Plön, to the north of Tellingstedt and to the north of Oldensworth (Fig.3). The quantified movement potential describe recent processes wirhin these areas. Active faults are located in the areas Sterup, Schwarzenbek and Plön. Their activity is documented by the course of mapped lineaments that fit with the crop out of near surface faults. In addition, a recently subsiding axial depression is located in the area Plön. The recent activity is caused by solution of sediments below the depression.
For areas with high movement potential the influence of tectonic and halokinetic structures on the development of recent topography is documented. Thus near surface faults have an influence on the development of lake Plön. In the areas Schwarzenbek near surface faults cause a deviation of the river Elbe. For the areas Sterup and Oldensworth an interaction between ice loading and mobility of salt can be shown. Thus deposition of Quaternary sediments and the development of the catchment areas of the rivers Eider and Schlei-Trave are influenced by salt rise of the salt structures Sterup and Meezen. In the area Oldensworth cross sections illustrate the dependence between salt rise and the deposition of Quaternary sediments. The course of the river Elbe from Hamburg to its river mouth is influenced by salt structures that are located in the upper 1000 m.

Digital elevation model of Schleswig-Holstein´s modern topography with salt structures, faults from Base Zechstein to Base Middle Miocene/Pliocene (after Baldschuhn et al. 1996) and projected near surface faults (Lehné 2005).

Result of the correlation between Base Zechstein and Base Upper Cretaceous for the area of Schleswig-Holstein. A high positive correlation coefficient (r = 0.75 to 1) is coloured red, a negative correlation coefficient (r = -0.75 to -1) is coloured yellow. In addition the salt structures of the Base Zechstein (after Baldschuhn et al. 1996) are displayed. Salt structures: I = Oldensworth, II = Hennstedt, IV = Oldenbüttel, VI = Warnau, VII = Segeberg, VIII = Sterup, XIII = NW-SE trending correlation area in the northwest of the study area. Green: rim of the Glückstadt Trough.

Quantified recent movement potential on the basis of seven parameters for the area of Schleswig-Holstein. In addition salt structures, faults from Base Zechstein to Base Middle Miocene/Pliocene (after Baldschuhn et al. 1996) and projected near surface faults are displayed. Altogether 5 areas show increased movement potential (Lehné 2005).

DFG-SPP 1135: High resolution seismic survey of the uppermost 200 m in tectonically and halokinetically active structures in Schleswig-Holstein, Germany

Integrated in the DFG-SPP 1135 "Dynamics of sedimentary systems under varying stress regimes: The example of the Central European Basin", the objective of this study is to extrapolate the movement-rates of active faults during the Holocene, Pleistocene and the Tertiary and depict the causes and mechanisms of active movements in the upper crust in Schleswig-Holstein. On the basis of earlier works (Lehné, 2005), 5 working areas with an increased movement potential were selected, where high resolution seismic surveys will be done during the next three years. Consisting of a total of 50 2D-seismic profiles of altogether 12,5 km length, the resulting net will help to detect the exact position, inclination and slip rate of assumed near surface faults of the uppermost 200 m. After the processing of seismic data, results of the survey will be combined with data from the GIS "Bewegungspotentiale" and existing stratigraphical information from nearby boreholes, provided by the LANU (Landesamt für Natur und Umwelt des Landes Schleswig-Holstein), to develop a 3D-model of each working area including known fault systems. Based on the understanding of the upper crust movement-processes, offset-rates will be extrapolated for the next 20 years. The seismic profiles will be generated during 5 field campaigns, using a 48 channel "Geometrics Geode" reflection seismic setup with MGOS-software.

In September 2003 two seismic profiles were produced by Fa. Thor, Kiel. Profile 1 runs through an recently subsiding axial depression.

The tomography (delta t-v-inversion) of profile 1 shows the axial depression, that is most likely caused by a near surface fault and chemical solution of Cretaceous sediments in an area of intensed Fluid movements.