Geomechanical Markers of the Stress and Strain State and Interaction of Structures in Inhomogeneous Geoenvironments

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Abstract

Geodynamics in an inhomogeneous 3D-geoenvironment, due to gravitational processes, is characterized by fields of displacement, rotations and deformations. The quantitative and dimensional characteristics of the distribution of these fields are provided by the corresponding stress fields. The results of computational experiments modeling the stress and strain state of two profiles are presented. The distribution of fields in depth is due to density inhomogeneity, one of the internal sources of tectonic stresses. The generalization of the component analysis showed the general properties of the stress and strain state, which is characterized by stretching against the background of prevailing compression. The stress intensity parameter is used to model the interaction features of inhomogeneous profile structures. The degree of plasticity of the geoenvironment is modeled by the deformation intensity parameter.

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About the authors

E. B. Osipova

Ilyichev Pacific Oceanological Institute of the FEB of the RAS

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Email: osipov@poi.dvo.ru
Russian Federation, Vladivostok

References

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Supplementary files

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2. Fig. 1. Position of profiles 1.1-1.8 and 2.1-2.10 in the square 45.0° ÷ 50.0°N, 149.0° ÷ 156.0°E. The digital elevation model was built using data from http://topex.ucsd.edu [19]

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3. Fig. 2. Mora circles at current points along profiles 1.1-1.8 and 2.1-2.10

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4. Fig. 3. Reconstruction of the εint strain intensity field along the profiles: a: 1.1-1.8 strain intensity values 2.07 ⋅ 10-5 ≤ εint ≤ 2.35 ⋅ 10-5, horizontal density boundaries are indicated by dashed and solid lines, faults in the upper part correspond to the model [17]; b: 2. 1-2.10 deformation intensity values 2.04 ⋅ 10-5 ≤ εint ≤ 2.44 ⋅ 10-5, density values, density block boundaries and faults correspond to the model [13]

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5. Fig. 4. Distribution of isolines and gradient fields of Tint stress intensity along the profiles: a: 1.1-1.8 (length 700 km, depth 30 km), horizontal boundaries of density interfaces are marked by dashed and solid lines, in the upper part faults are marked by solid line, correspond to the model [17]; b: 2.1-2.10 (length 500 km, depth 35 km), boundaries of density blocks and faults correspond to the model [13]. The intersection of profiles 1.1-1.8 and 2.1-2.10 is marked by the white solid line

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6. Fig. 5. Distribution of isolines, gradients ΔTint of the stress intensity field ΔTint and model "blocks" delineated by line I, within which ΔTint ≤ 2.5 GPa/km, along the profiles: a: 1.1-1.8, in the upper part the faults are marked by a solid line and correspond to the model [17]; b: fragment of profile 2.1-2.10 with the length of 100 km ≤ L ≤ 350 km, the boundaries of density blocks and faults correspond to the model [13]. Asterisks indicate hypocentres of the Simushir earthquakes of 2006, 2007

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