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Near-Vertical and Wide-Angle Seismic Surveys in the Schwarzwald

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The German Continental Deep Drilling Program (KTB)

Abstract

A unified seismic exploration program, consisting of 345 km of deep reflection profiling, a 200 km refraction profile, an expanding spread profile and near surface high-resolution measurements, revealed a strongly differentiated crust beneath the Black Forest. The highly reflective lower crust contains numerous horizontal and dipping reflectors at depths of 13–14 km down to the crust-mantle boundary (Moho). The Moho appears as a flat and horizontal first order discontinuity at a relatively shallow level of 25–27 km above a transparent upper mantle. In the seismic model based on near-vertical and wide-angle data the lower crust consists of lamellae with an average thickness of about 100 m and velocity contrasts increasing with depth. The upper crust is characterized by a discontinuous pattern of mostly dipping reflectors which are related to Hercynian overthrusting and accretion and to late-Hercyni an extensional faulting. A bright spot at 9.5 km depth is interpreted to be due to low-velocity material. The lower part of the upper crust appears as a relatively transparent zone which is also identified as a low-velocity zone situated directly above the laminated lower crust.

reprint of J.Geophys. (1987) 62:1–30

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Lüschen, E. et al. (1989). Near-Vertical and Wide-Angle Seismic Surveys in the Schwarzwald. In: Emmermann, R., Wohlenberg, J. (eds) The German Continental Deep Drilling Program (KTB). Exploration of the Deep Continental Crust. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74588-1_14

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