DOI: 10.5880/gfz.dekorp-3b_mve_east.001
title: Deep seismic reflection profile DEKORP 1990-3B/MVE (East) across the northern Bohemian Massif, East Germany

description: The 250 km long profile 3B/MVE (East) was recorded in 1990 as part of the joint seismic reflection venture DEKORP 1990-3/MVE (Muenchberg-Vogtland-Erzgebirge) between the two former German Republics shortly before their unification. The aim of DEKORP 1990-3/MVE was to explore the structure of the crust from the Rhenish Shield through the Bohemian Massif to the Ore Mountains. The entire profile consists of DEKORP 3A, DEKORP 3B/MVE (West) and its prolongation to the east DEKORP 3B/MVE (East). Its total length amounts to about 600 km. 24 short seismic cross lines and associated 3D blocks with single fold coverage were also recorded. The seismic survey of 3B/MVE (East) was conducted to investigate the deep crustal structure of the Saxothuringian Zone of the Central European Variscian Belt along the northern margin of the Bohemian Massif with high-fold near-vertical incidence vibroseis acquisition. The main objectives were to image the deep structures of the Muenchberg Gneiss Complex, to concern the volume of Variscan granites by combining seismic and gravity data as well as to determine the origin and nature of the deep regional NW-trending fault systems. Details of the experiment, preliminary results and interpretations were published by DEKORP Research Group (B) et al. (1994) and Förste, Lück & Schulze (1994). The Technical Report of DEKORP 3B/MVE (East) gives complete information about acquisition and processing parameters. The European Variscides, extending from the French Central Massif to the East European Platform, originated during the collision between Gondwana and Baltica in the Late Palaeozoic. Due to involvement of various crustal blocks in the orogenesis, the mountain belt is subdivided into distinct zones. The external fold-and-thrust belts of the Rhenohercynian and Saxothuringian as well as the predominantly crystalline body of the Moldanubian dominate the central European segment of the Variscides. Polyphase tectonic deformation, magmatism and metamorphic processes led to a complex interlinking between the units. The 3B/MVE (East) line runs in SW-NE direction along the southern margin of the Saxothuringian belt from the Franconian Line, the southwestern boundary fault zone of the Bohemian Massif, to the Lausitz Massif. It traverses the allochthonous Muenchberg Gneiss Complex, the Cambro-Ordovician South Vogtland Syncline Zone, the Eibenstock-Karlovy Vary Granite Complex as well as the Ore Mountains crystalline blocks, the most significant Bouguer gravity low in Central Europe. Besides, the line intersects several NW-fault systems such as the Floeha Zone fault system and the Mid Saxon fault (DEKORP Research Group (B) et al., 1994). The line 3B/MVE (East) is complemented by eight short cross lines. To the west the profile is extended by DEKORP 3B/MVE (West). In the Muenchberg Gneiss Complex the 3B/MVE (East) profile is crossed by DEKORP 4N, which runs parallel to the western border of the Bohemian Massif near the KTB drilling site. Farther to the east the line has an intersection with DEKORP 9501 (GRANU).
description: The German Continental Seismic Reflection Program DEKORP (DEutsches KOntinentales Reflexionsseismisches Programm) was carried out between 1984 – 1999 as the German national reflection seismic program funded by the Federal Ministry of Research and Technology (BMFT), Bonn [now: the Federal Ministry of Education and Research (BMBF)]. DEKORP was administrated by the former Geological Survey of Lower Saxony (NLfB), Hannover [now: the State Authority for Mining, Energy and Geology (LBEG)]. In 1994 the DEKORP management was taken over by the Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences. The aim of DEKORP was to investigate the deep crustal structure of Germany with high-resolution near-vertical incidence (mostly vibro)seismic acquisition, supplemented by wide-angle seismic and other target-oriented piggy-back experiments, all complemented by optimized methods of data processing and interpretation. The DEKORP project was closely linked with the KTB (German continental deep-drilling program) and was an equivalent to many other deep-seismic programs world-wide such as COCORP, BIRPS, LITHOPROBE, ECORS, CROP, BELCORP, IBERSEIS and many more. The DEKORP-Atlas (Meissner & Bortfeld, 1990) gives a detailed overview about most of the different campaigns and results. In sum, the resulting DEKORP database includes approximately 40 crustal-scale 2D-seismic reflection lines covering a total of ca. 4 700 km and one 3D-seismic reflection survey covering ca. 400 km². Each DEKORP survey is provided with all datasets that are necessary for either a re-processing (i.e. raw unstacked field records in SEGY) or a re-interpretation (i.e. finally processed sections in SEGY or PNG). The raw data are sorted by records or by CDPs. The final data are available as unmigrated or migrated stacks without or with coherency enhancement. Automatical line-drawings are also included. All data come with additional meta information for each domain (source, receiver, CDP) like coordinates, elevations, locations and static corrections combined in ASCII-tables for geometry assignment. Furthermore, all metadata originating from paper copies are made available as scanned files in PNG or PDF, e.g. field and observer reports, location maps in different scales, near-surface profile headers and others. The DEKORP datasets provide unique and deep insights into the subsurface below Germany covering the earth’s crust from the surface to the upper mantle and are increasingly requested by academic institutions and commercial companies. Fields of applications are geothermal development, hazard analysis, hydrocarbon/shale gas exploration, underground gas storage, tunnel construction and much more.