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3D crustal stress state of Germany according to a data-calibrated geomechanical model

Ahlers, Steffen ; Henk, Andreas ; Hergert, Tobias ; Reiter, Karsten ; Müller, Birgit ; Röckel, Luisa ; Heidbach, Oliver ; Morawietz, Sophia ; Scheck-Wenderoth, Magdalena ; Anikiev, Denis (2021):
3D crustal stress state of Germany according to a data-calibrated geomechanical model. (Publisher's Version)
In: Solid Earth, 12 (8), pp. 1777-1799. Copernicus, ISSN 1869-9529,
DOI: 10.26083/tuprints-00019651,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: 3D crustal stress state of Germany according to a data-calibrated geomechanical model
Language: English
Abstract:

The contemporary stress state in the upper crust is of great interest for geotechnical applications and basic research alike. However, our knowledge of the crustal stress field from the data perspective is limited. For Germany basically two datasets are available: orientations of the maximum horizontal stress (SHmax) and the stress regime as part of the World Stress Map (WSM) database as well as a complementary compilation of stress magnitude data of Germany and adjacent regions. However, these datasets only provide pointwise, incomplete and heterogeneous information of the 3D stress tensor. Here, we present a geomechanical–numerical model that provides a continuous description of the contemporary 3D crustal stress state on a regional scale for Germany. The model covers an area of about 1000×1250 km2 and extends to a depth of 100 km containing seven units, with specific material properties (density and elastic rock properties) and laterally varying thicknesses: a sedimentary unit, four different units of the upper crust, the lower crust and the lithospheric mantle. The model is calibrated by the two datasets to achieve a best-fit regarding the SHmax orientations and the minimum horizontal stress magnitudes (Shmin). The modeled orientations of SHmax are almost entirely within the uncertainties of the WSM data used and the Shmin magnitudes fit to various datasets well. Only the SHmax magnitudes show locally significant deviations, primarily indicating values that are too low in the lower part of the model. The model is open for further refinements regarding model geometry, e.g., additional layers with laterally varying material properties, and incorporation of future stress measurements. In addition, it can provide the initial stress state for local geomechanical models with a higher resolution.

Journal or Publication Title: Solid Earth
Journal volume: 12
Number: 8
Publisher: Copernicus
Classification DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Engineering Geology
Date Deposited: 22 Sep 2021 08:33
Last Modified: 22 Sep 2021 08:34
DOI: 10.26083/tuprints-00019651
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-196516
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19651
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