Deep Structure of the Barents-Kara Region According to Geophysical Investigations Along 1-AR and 2-AR Geotravers

Egorov, A.S.; Vinokurov, I. Yu.; Kalenich, A.P.; Belevskaya, E.S.; Ageev, Aleksei

doi:10.3997/2214-4609.201600173

Cited by 4 publications

(3 citation statements)

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“…The dependence of karst formation both on dynamics of endogenous fracture tectonics and on exogenous factors [13,22,23] leads to continuous dynamics of karst development and to a nonzero hazard of the new vertical subsidence under the fast healing of karst formations. This implies the relevance of geodynamic evaluation of the area [20,24,25], especially under conditions of extensive mine workings, which are observed within the investigated object. Previously, the authors carried out the investigation of a seismogenic hazard in the vicinity of geodynamically active geoblocks because of activation of fault tectonics under conditions of hydraulic fracturing [10], with application of non-potential geofields.…”

Section: Figurementioning

confidence: 89%

Increasing Resolution of Seismic Hazard Mapping on the Example of the North of Middle Russian Highland

et al. 2021

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The standard problem of engineering geophysics, solved for road and house building and other construction types, is in the localization of areas with increased mobility in the upper part of a geological cross-section and in the parameterization of this mobility in terms of seismic intensity. There is a standard approach, according to which researchers assess the elastic strength characteristics of the core to a depth of about 30 m, implement the accumulation of seismogram observations, simulate accelerograms for particular conditions and, taking into account the data of complex geophysical methods, calculate the increment of seismic intensity as one of the parameters of a seismic hazard. The final result of this approach has the form of a seismogenic hazard map and a set of recommendations including the consideration of identified areas with a significant increasing seismic intensity increment, due to the peculiarities of the geological structure of polygons. This result is reliable, but very expensive, and requires the development of primary estimations of the rock massif with reduced resistance to external loads, which would optimize the efforts in engineering drilling and in field geophysical measurements in order to densify their spatial grid in the vicinity of a priori known positions with an increased seismogenic hazard. In addition, relatively sparse grids of wells, as well as local geophysical profiles laid under conditions of a complicated landscape, do not accurately localize risky areas in order to focus the attention of builders on strengthening the specific part of raised constructions. Following the wishes of our customers and relying on long-term testing of our interpretational developments, we formed an approach to primary hazard forecasting based on remote sensing data and digital elevation models, which can be classified as data with relatively free access. This article presents the results of research which was based on these free-of-charge data and which was developed in the field of construction of ground engineering structures for agricultural purposes, where one of the factors of mobility in the upper part of a cross-section is intensive karstification. Basically, the construction area according to the general seismic zoning maps is seismologically passive, though the relatively fast dynamics of karst determines the relevance of the detailed seismic zoning. The results of our interpretations are verified by deep geological and structural reconstructions based on wave analogies. The representativeness of the final forecast was confirmed by subsequent seismic assessments, which is related to the scientific novelty of the presented article. The authors’ technology for the qualitative and quantitative interpretation of remote sensing data and digital elevation models with high resolution provides the opportunity to increase the spatial resolution of seismic microzonation forecasts, implemented by standard geophysical methods, and it determines the practical significance of completed research.

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Section: Figurementioning

confidence: 89%

Increasing Resolution of Seismic Hazard Mapping on the Example of the North of Middle Russian Highland

et al. 2021

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“…This intensity is higher in Tula Region compared to neighbouring territories owing to greater fragmentation and relatively high fracturing of carbonate strata. The dependence of karst formation both on dynamics of endogenous fracture tectonics and exogenous factors [12]- [14] bring about continuous dynamics of karst development and nonzero hazard of new vertical subsidence under the fast healing of karst formations implying the rele-vance of geodynamic evaluation of area [10], [15], [16]; it especially under conditions of extensive mine workings, which are observed within the investigated object. Previously, the authors have analyzed seismogenic hazard in the vicinity of geodynamically active geoblocks because of activation of fault tectonics under conditions of hydraulic fracturing [17] with application of non-potential geofields.…”

Section: Figure 1 Geostructural Position Of the Analyzed Area (According To Vn Brykhanov Va Boosh And Agchikishev): (A) Schematic Map Of mentioning

confidence: 98%

Early assessment of seismic hazard in terms of Voronezh massif-Moscow Depression contact

Movchan¹,

Yakovleva²,

Movchan³

et al. 2021

Min. miner. depos.

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Purpose is to develop a system approach for early assessment of areas being of high seismic hazard and characterizing by low stability of rock mass relative to external loads. Methods. Well cores have been assessed down to 30 depth and seismic observations have been accumulated. Complexes of field geophysics methods have been applied for the research as well as remote sensing materials, digital model of surface relief, and techniques of qualitative and quantitative interpretation. Findings. Seismic hazard map has been formed in terms of seismic intensification and ground displacement units. The abovementioned is quite reliable but a cost-based result involving early assessments of high seismic hazard areas to infill network of geophysical measurements in the neighbourhood of the areas for their further quantitative characterization. It has been identified that rare well network and definite geophysical lines, run under conditions of a complex terrain, cannot localize the areas of high seismic hazard to focus builders on the enforcement of certain components of the erected structures. It has been defined that end result of the prognostic developments takes a shape of mapping of local areas with the decreased stability of upper share of the geological section supported by further measurements by means of a common depth point method (CDP). Comparison of potential secondary earthquake sources with high permeability zones makes it possible to predict highly reliable areas of the increased seismic magnitude. Originality.For the first time, interpretation techniques have been adapted to describe parametrically nonpotential geofields (i.e. optical density of remote basis; and relative elevation), accepted during the steps of potential field processing, with the use of wave analogies. Practical implications.The methods have been developed helping optimize field geological and geophysical operations in terms of area and well number as well as measuring stakes under the conditions of the limited prior data amount.

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“…With an average crack opening of about 5–7 mm, the crack length relative to the horizontal body of the well can be significant, reaching hundreds of metres [34,35]. Taking into account the length of the actual horizontal body of the well, ranging from the first hundred metres to 1–2 km, there is a probability of crossing the system of activated geological fracture and areas of regional geodynamics [36,37]. It has been observed that the operation of hydraulic fracturing may lead to significant seismic responses far beyond the immediate neighbourhood of the drilling location used for the gas and oil production or liquid waste management [3,38].…”

Section: Introductionmentioning

confidence: 99%

Modelling of seismic assessment for large geological systems

Movchan

Yakovleva

Frid

et al. 2022

Phil. Trans. R. Soc. A.

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A new approach to seismic analysis has been introduced and demonstrated for a sequence of recent seismic events recorded in the Blackpool region of Lancashire, UK. The seismic activity, induced by an industrial hydraulic fracturing at a depth exceeding 2 km, had the extent of registered surface elastic vibrations reaching a distance exceeding 15 km. The analysis is based on the study of elastic fields, three-dimensional extrapolations of the landscape and the novel reconstruction of a three-dimensional digital model of seismic map boundaries and vertical profiles. The verification of the proposed approach is carried out via the comparison with published data of the Blackpool seismic events, combined with the new spectral analysis linked to the identified regions of seismic activity. The latter was accompanied by a finite-element simulation of vibrations for an elastic layer of variable thickness, approximating the test region. The analysis and numerical modelling have demonstrated consistency with the dynamic nature of structural stratification of the geological systems, and in addition, the predictive nature of the modelling work was demonstrated by the comparison of the model eigenmodes with the published parameters of registered earthquakes in the Blackpool area. This article is part of the theme issue ‘Wave generation and transmission in multi-scale complex media and structured metamaterials (part 1)’.

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Deep Structure of the Barents-Kara Region According to Geophysical Investigations Along 1-AR and 2-AR Geotravers

Cited by 4 publications

References 0 publications

Increasing Resolution of Seismic Hazard Mapping on the Example of the North of Middle Russian Highland

Increasing Resolution of Seismic Hazard Mapping on the Example of the North of Middle Russian Highland

Early assessment of seismic hazard in terms of Voronezh massif-Moscow Depression contact

Modelling of seismic assessment for large geological systems

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