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Imaging a shallow salt diapir using ambient seismic vibrations beneath the densely built-up city area of Hamburg, Northern Germany

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Abstract

Salt diapirs are common features of sedimentary basins. If close to the surface, they can bear a significant hazard due to possible dissolution sinkholes, karst formation and collapse dolines or their influence on ground water chemistry. We investigate the potential of ambient vibration techniques to map the 3-D roof morphology of shallow salt diapirs. Horizontal-to-vertical (H/V) spectral peaks are derived at more than 900 positions above a shallow diapir beneath the city area of Hamburg, Germany, and are used to infer the depth of the first strong impedance contrast. In addition, 15 small-scale array measurements are conducted at different positions in order to compute frequency-dependent phase velocities of Rayleigh waves between 0.5 and 25 Hz. The dispersion curves are inverted together with the H/V peak frequency to obtain shear-wave velocity profiles. Additionally, we compare the morphology derived from H/V and array measurements to borehole lithology and a gravity-based 3-D model of the salt diapir. Both methods give consistent results in agreement with major features indicated by the independent data. An important result is that H/V and array measurements are better suited to identify weathered gypsum caprocks or gypsum floaters, while gravity-derived models better sample the interface between sediments and homogeneous salt. We further investigate qualitatively the influence of the 3-D subsurface topography of the salt diapir on the validity of local 1-D inversion results from ambient vibration dispersion curve inversion.

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Authors and Affiliations

  1. NORSAR, P. O. Box 53, 2007, Kjeller, Norway

    Daniela Kühn

  2. Department of Geosciences, University of Potsdam, Karl-Liebknecht-Strasse 24, Haus 27, 14476, Potsdam, Germany

    Matthias Ohrnberger

  3. Institute of Geophysics, University of Hamburg, Bundesstr. 55, 20146, Hamburg, Germany

    Torsten Dahm

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  1. Daniela Kühn
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  2. Matthias Ohrnberger
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  3. Torsten Dahm
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Correspondence to Daniela Kühn.

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Kühn, D., Ohrnberger, M. & Dahm, T. Imaging a shallow salt diapir using ambient seismic vibrations beneath the densely built-up city area of Hamburg, Northern Germany. J Seismol 15, 507–531 (2011). https://doi.org/10.1007/s10950-011-9234-y

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