Abstract
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.
Highlights
The investigated area is located on the joint of two Precambrian structures – the northern slope of Voronezh massif and the southern slope of Moscow Depression (Central Russian syneclise)
The analysis has been performed based on the transition from small to large scale: from the location of polygon position at the contact of Precambrian structures up to deriving the particular identification of regional fault in the vicinity of the area of interest
Despite the seismologically stable structural-tectonic position, the area is placed in the zone of widespread limestone which causes karst development and final reduction in the stability of the upper part of geological cross-section
Summary
The investigated area is located on the joint of two Precambrian structures – the northern slope of Voronezh massif and the southern slope of Moscow Depression (Central Russian syneclise). It is mapped within the periphery of large circular geological structure being 250 km in diameter. The circular structure is observed within the territory of Tula and Oryol Regions (Tula dome and ring structure) coinciding with significant part of Central Russian Upland (Fig. 1a) [1]. There are few kilometers from Shchekino to the area of the planned construction Another northeast-directed regional fault is in the eastern part of Tula Region.
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