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Magnetotelluric investigation on Björkö impact structure, west of Stockholm, Sweden

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Abstract

This paper describes the application of magnetotelluric (MT) method to investigate Björkö impact structure located at west of Stockholm, Sweden. This structure has formed in crystalline rocks ca. 1.2 Ga ago and located relatively close to the district heating infrastructure of the Stockholm region, as the largest district heating system in Europe. Since impact structures mostly contain fractured rock volumes in the form of breccia formations, the occurred brecciation zones in this region are more favorable potential targets for geothermal investigations. The main objective is evaluating the capability of the study area to have potential for geothermal resources by mapping the subsurface structure. To image electrical characteristic of underground layers, 1D and 2D bimodal inversions of TE and TM modes of MT data are performed. The results are also compared with the outputs of the inversion of the determinant data (yielding a direction-independent average of the subsurface conductivity) along the same profiles, proving good accordance of the outputs. The processed resistivity sections at depth along with measuring various rock physical properties across two drilled boreholes at Björkö and Midsommar islands localized two conductors at depths of 1 km and from 2.5 to 4.5 km, which may be attributed to be a potential zone for geothermal energy retrieval.

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Acknowledgments

The authors thank the Geological Survey of Sweden for providing the background geology information of the studied area and the Department of Earth Sciences of Uppsala University for the MT data. We would like to appreciate Professors Siripunvaraporn and Egbert for providing their code to model the data. The Institute of Geophysics of the University of Tehran is acknowledged for providing facilities for reprocessing all old data. The respectful reviewers are also appreciated for their constructive and valuable comments, which helped us to improve the quality of the work.

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Authors and Affiliations

  1. Institute of Geophysics, University of Tehran, Tehran, Iran

    Behrooz Oskooi

  2. Royal Institute of Technology, Stockholm, Sweden

    Herbert Henkel & Ann Bäckström

  3. Department of Earth Sciences, Uppsala University, Uppsala, Sweden

    Laust B. Pedersen

  4. Land and Water Resources Engineering, Civil Engineering, Pöyry Sweden, Stockholm, Sweden

    Ann Bäckström

  5. Department of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran

    Maysam Abedi

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  1. Behrooz Oskooi
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  2. Herbert Henkel
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  3. Laust B. Pedersen
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  4. Ann Bäckström
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  5. Maysam Abedi
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Correspondence to Behrooz Oskooi.

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Oskooi, B., Henkel, H., Pedersen, L.B. et al. Magnetotelluric investigation on Björkö impact structure, west of Stockholm, Sweden. Arab J Geosci 9, 618 (2016). https://doi.org/10.1007/s12517-016-2653-x

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