Methodical Features of Studying the Geological Structure of the Coastal Part of the Sea of Okhotsk Based on the Integration of Continuous Aquatic Electrical Sounding and Seismoacoustics Data

Lalomov, D.; Glazunov, V.V.; Tatarskiy, A.; Burlutsky, S.; Ефимова, Н. Н.

doi:10.3997/2214-4609.201903466

Cited by 3 publications

(1 citation statement)

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“…The increase in the CDP order at the junction of geophone arrays led to the application of an additional 12 VP along the flank observation system with variable offset from 2.5 to 57.5 m. Thus, the CDP order changed from 12 to 24 because of the low relative intensity of the target wave in the fractured rocks. Office processing of field data was carried out by RadExPro software, designed for integrated processing of data of surface engineering seismics as well as for quality control of field seismic data [44]. In total, during the processing, 21 sets of seismic determinations were identified, which fitted into three types of structuring of the velocity and depth propagation of the wave extremum: one-according to CDP, and twoaccording to the "refraction correlation method" (RCM).…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

et al. 2021

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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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Multi-Physics of Dynamic Elastic Metamaterials and Earthquake Systems

et al. 2021

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Microstructured materials, namely metamaterials, are one of the most relevant topics of the recent period due to their interdisciplinary nature. Driven by their wide range of applications, we provide an overview of a class of elastic solids which embed dynamic microstructures capable of trapping energy when subject to dynamic loads. Based on the recently developed modeling approaches, we show several applications related to wave cloaking, filtering and also multi-structured surfaces, often referred to as meta-surfaces. These culminate in the analysis of a practical example, based on a real-life recent seismic event induced by a hydrofracture exploration. The latter shows the viability of the vibration analysis in the assessment of the seismic response, and also the role of meta-surfaces as localisers of vibrations, e.g. suggesting non-periodic earthquake tolerant design strategies of housing estates.

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Methodical Features of Studying the Geological Structure of the Coastal Part of the Sea of Okhotsk Based on the Integration of Continuous Aquatic Electrical Sounding and Seismoacoustics Data

Cited by 3 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

Multi-Physics of Dynamic Elastic Metamaterials and Earthquake Systems

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