The Dispersion of Horizontal Tectonic Stresses in the Earth's Crust in the Baltic Region / Žemės Plutos Horizontaliųjų Tektoninių Įtempių Pabaltijo Teritorijoje Sklaida / Распределение Тектонических Горизонтальных Напряжений Земной Коры В Прибалтике

Zakarevičius, Algimantas; Šliaupa, Saulius; Paršeliūnas, Eimuntas; Būga, Aūrnas; Stanionis, Arminas

doi:10.3846/13921541.2011.595171

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…This information is necessary in solving various geodetic tasks of the high precision measurements (Mäkinen et al, 2006;Petroškevičius et al, 2008;Petroškevičius, 2004;Aleksejenko et al, 2012), performing investigations of a geoid (Denker et al, 2008;Krynski and Lyszkowicz, 2007;Kuhar et al, 2011) and geodynamic studies (Zakarevičius et al, 2011), executing the resources survey and in solving various geophysical, navigational and similar tasks.…”

Section: Introductionmentioning

confidence: 99%

Analiza kakovosti nacionalne gravimetrične mreže v Litvi

Petroškevičius¹,

Paršeliūnas²,

Birvydienė³

et al. 2014

geod. vestn.

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Section: Introductionmentioning

confidence: 99%

Analiza kakovosti nacionalne gravimetrične mreže v Litvi

Petroškevičius¹,

Paršeliūnas²,

Birvydienė³

et al. 2014

geod. vestn.

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Reactivation of Non‐Optimally Orientated Faults Due to Glacially Induced Stresses

Steffen

2021

Tectonics

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The deformation due to an ice load is accompanied by displacement and stress changes. These stress changes are known to have created large‐magnitude earthquakes along pre‐existing faults during and after deglaciation of the Late Quaternary ice sheets. However, these so‐called glacially induced faults have been found to be not optimally orientated in their respective regional stress regime. Here, we analyzed the potential of non‐optimally orientated fault reactivation within a glacially induced stress field as well as changes of the stress regimes due to these additional stresses. A finite element model is used to estimate glacially induced stresses, which are then combined with background stress magnitudes. Non‐optimally orientated faults can be reactivated by glacially induced stresses within thrust‐, strike‐slip‐, and normal‐faulting stress regimes, but depending on their location with respect to the ice sheet and their orientation within the regional stress field. While faults with large variations of dip and strike outside of the ice sheet are prone to reactivation when the background stress field is a normal‐ or strike‐slip‐faulting stress regime, faults within a thrust‐faulting stress regime can also be reactivated within the ice margin during and after the deglaciation. Outside the ice margin, instabilities in a thrust‐faulting stress regime develop along the intermediate principal stress axis. Stress regime changes can occur for all background stress states. Finally, we find that certain conditions in a strike‐slip‐faulting stress regime can also explain the observed glacially induced thrust faults in Northern Europe.

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Accuracy Assessment of the Principal Strains in Deformation Analysis

Bannikov,

Gordeev

2023

SGEM International Multidisciplinary Scientific GeoConference� EXPO Proceedings

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Research Object and Relevance. The main components of the strain tensor and their accuracy assessment are the research objects in this work. When conducting monitoring using geodetic methods, it is usually not enough to determine only the displacements of reference points; it is also necessary to determine the presence and magnitude of deformations. This task is directly related to the accuracy assessment of such characteristics as principal strains, dilatation, shear strains, and rotation. Research Methods. In conducting this research, the authors used a system of equations arising on a local subdomain of triangular shape in the finite element method for a twodimensional deformation model. The parametric principle of accuracy assessment was applied, where the components of the strain tensor were taken as parameters. Results. More rigorous formulas for the mean square error functions of principal strains have been found. The influence on their accuracy assessment of both the triangle shape and the directions of principal strains is shown. Based on geodynamic monitoring data of a tailings dam, mathematical modeling of the influence of the finite element shape on the possible error in the accuracy assessment of principal strains was carried out. Discussion. The results of analyzing the influence of covariances that arise naturally between the components of the strain tensor show the most interesting results when assessing the accuracy of principal strain components. The non-symmetry of principal strain accuracy estimates for a triangular element shape other than an equilateral triangle is convincingly shown. Conclusion. This study demonstrates the need for more rigorous approaches to assessing the accuracy of deformation characteristics. Incorrect interpretation of monitoring results can lead to both unnecessary labor and financial costs, as well as fatal consequences due to incorrect assumptions in calculations.

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Cited by 3 publications

References 11 publications

Analiza kakovosti nacionalne gravimetrične mreže v Litvi

Analiza kakovosti nacionalne gravimetrične mreže v Litvi

Reactivation of Non‐Optimally Orientated Faults Due to Glacially Induced Stresses

Accuracy Assessment of the Principal Strains in Deformation Analysis

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