Nina. Nikolaevna. Nevedrova

Institute of Computational Mathematics and Mathematical Geophysics | ICMMG

Year by year researchers use the method of electrotomography more extensively to solve a wide variety of tasks. For example, electrotomography can be applied in archaeological excavations, in the tasks of controlling mine tailings, in engineering surveys, to study fault structures, for monitoring studies in seismically active areas. It is necessary...

The article considers the method of observations, interpretation of data and results of electromagnetic monitoring with a controlled source for one of the seismically active regions of Siberia – Mountain (Gorny) Altai. The monitoring is carried out during the aftershock period in the epicentral zone of the destructive Chuya earthquake of 2003 with...

The article presents the results of the interpretation of unique archival data of vertical electrical soundings obtained in the Selenga basin of the Baikal rift zone in the 50s of the last century by the detachment of the Baikal geophysical expedition of the PGO "Irkutskgeofizika", using modern computer technologies. The purpose of this work is to...

In this paper we present the results of our studies of sections of the Uimon basin in Gorny Altai (Russia) using a complex of electrical prospecting methods. The areas of Baratal Formation at the surface have been investigated. This areas explored in order to understand the stages of formation of the depression. In addition, the possibilities of th...

The southern site is located in the junction zone of the Southwestern and Eshtykel bench, where vertical electrical soundings were performed, and a preliminary fault-block depth model was built based on the results of field data interpretation using a horizontally layered model. Comparison of geoelectric and seismological data showed that the epice...

The paper presents the results of three-dimensional modeling of the fault structure in the central part of the Chuya depression in Gornyi Altai within the Mukhor-Tarkhata plot. On this site, from 2004 to the present, researchers of the IPGG SB RAS have been conducting regular annual observations by the method of nearfield time-domain electromagneti...

The article presents the deep structure of the poorly studied Uimon depression in Gorny Altai according to the data of transient electromagnetic sounding. The studies are relevant due to the high seismic hazard of the area, and are also in demand for prospecting and exploration of minerals predicted there. In order to construct geoelectrical models...

Based on the analysis of the field data of nonstationary electromagnetic soundings with different installations, the evolution of the stressed state of the geological massif in the epicentral region of the destructive 2003 Мw7.3 Chuya earthquake is investigated in the paper. The measurements by these methods were executed in a lot of regular points...

The Kurai Basin of Gorny Altai is located in the area of high seismic activity, which is involved in the focal zone of the 2003 M 7.3 Chuya earthquake. Its aftershock process has not ceased yet, and shows the likelihood of major seismic events. The seismic monitoring records of the last 15 years after the devastating earthquake show the state of st...

This conference paper is about application of ERT to investigation of fault zones in the Altai Region

Paleoseismological studies confirm that the Uimon basin is thrust by its northern mountain border along the active South Terekta fault. The latest motion along the fault in the 7–8th centuries AD induced an earthquake with a magnitude of Mw = 7.4–7.7 and a shaking intensity of I = 9–11 on the MSK-64 scale. The same fault generated another event (M...

In the regions of high seismic activity, investigations of fault zones are of paramount importance as such zones can generate seismicity. A top task in the regional studies is determining the rates of activity from the data obtained by geoelectrical methods, especially considering the data on the faults covered by sediments. From a practical standp...

This paper presents an integrated measurement technique based on DC methods (vertical electrical sounding, electrical resistivity tomography) which was used to identify faults and determine their geoelectric parameters in the western part of the Chuya basin. New information on the structure of the Chagan River valley located in the zone of the disa...

This paper presents an integrated measurement technique based on DC methods (vertical electrical sounding, electrical resistivity tomography) which was used to identify faults and determine their geoelectric parameters in the western part of the Chuya basin. New information on the structure of the Chagan River valley located in the zone of the disa...

The relevance of the work is caused by the need to search for new industrial ore manifestations, due to the fact that most of the ex-plored deposits have already been worked out. The aim of the research is to identify ore promising objects in deep horizons and flanking parts of the Ubinsk ore field of the Rudny Al-tai using electromagnetic methods...

The Central Asian Orogen was reactivated in the Cenozoic, which gave rise to mountain systems and sedimentary basins, strike-slip and thrust faults, ramps, and rift basins under the far-field effect of the India-Eurasia collision. Pre-Cenozoic structures, as well as the superposed Cenozoic deformation, are traceable in the gravity pattern. Analysis...

Electromagnetic soundings with controlled and natural sources (TEM and MT, respectively) integrated with IP and geochemical surveys have been tested for petroleum exploration in West Siberia. The TEM method, with loop sizes smaller than the depth to the target, provide high resolution, sufficient penetration depth, and data locality. The MT method...

The deep structure of the Kurai basin and its junction with the flanking mountains has been studied by controlled-source resistivity surveys (vertical electric sounding and transient electromagnetic methods). According to the data processing results, the basin is the deepest along its northern, southern, and eastern margins. The sedimentary fill co...

На основе интерпретации данных геоэлектрики с контролируемым источником (методы ВЭЗ и ЗС) представлено глубинное строение основных элементов внутренней структуры Курайской впадины и определен характер ее пограничных взаимоотношений с горным обрамлением. Выявлено, что наиболее погруженные части впадины располагаются вдоль ее северного, южного и вост...

2 Институт нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАН, Новосибирск Профиль геофизических работ выполнен по фарватеру р. Лена. Исследования проводились комплексом методов (электромагнитные зондирования становлением поля, сейсморазведка ме-тодом ОГТ). По данным электроразведки получен полный геоэлектрический разрез осадочных отложени...

The article presents new data on the geoelectrical structure of Chuya, Kuray and Uymon intermountain basins, which are the three largest ones in Mountainous Altai, Russia. Geoelectrical models of the basins were constructed using the data obtained from field studies with application of a complex of electromagnetic methods, including transient elect...

Field data of the electromagnetic monitoring of controlled source have been obtained in two seismically active regions of Siberia. The article demonstrates an approach to the interpretation of regime observations data and it attempts to explain the variation of the electromagnetic parameters due to geodynamic processes, taking into account the pecu...

The article summarizes results of tectonophysical and geoelectric studies of rift basins in the Baikal region. Their sedimentary cover is intersected by faults, which induce shallow soft deformations in Late Cenozoic sediments. The faults observed in the internal part of the basins correlate with zones of contrast change in the deep structures of t...

The VES method was used to determine the geoelectric parameters of Cenozoic rocks in the Chuya intermontane basin. It was shown that the polyfacies and polychromous sediments filling the basin are well differentiated by their electrical parameters. A combination of methods used in data acquisition and processing, due to their high resolution capaci...

Выполнены вертикальные электрические зондирования (ВЭЗ), которые позволили получить па- раметрические характеристики кайнозойского разреза Чуйской межгорной впадины. Установлено, что полифациальные и полихронные отложения, выполняющие впадину, хорошо дифференцированы по электрическим параметрам. Использованные установки и аппаратура позволяют в гео...

Детально охарактеризована неотектоническая блоковая структура района Уймонской впадины. Приводятся результаты выполненного здесь в 2011 г. комплекса электромагнитных исследований (зондирования становлением поля, вертикальные электрические зондирования и электротомография на постоянном токе). Они дают первые представления о геоэлектрическом строении...

A procedure for the simultaneous interpretation of magnetotelluric and near-field transient electromagnetic sounding (MTS and NF TEMS, respectively) data is proposed. The advantages of the complex interpretation are demonstrated by specific examples. In accordance with the interpretation of the field data, geoelectrical sections of the lithosphere...

The results of geological, structural, tectonic, and geoelectric studies of the dry basins in the Baikal Rift Zone and western Transbaikalia, combined under the term Baikal region, are integrated. Deformations of the Cenozoic sediments related to pulsing and creeping tectonic processes are classified. The efficiency of mapping of the fault-block st...

We processed data from geophysical survey archives of the 1950s acquired in intermontane basins in the Baikal rift, including a large collection of vertical electric soundings (VES) from the Barguzin basin, which remained only partly interpreted. The processing and reinterpretation became possible with the advanced computing facilities and software...

The present paper offers the parameter of anisotropy for the use in processing experimental data of the joint seismic and electric monitoring with the aim of studying the process of consolidation in a fractured rock mass under a strong seismic load. Based on the interpreted experimental results, a seismic-electrical model is constructed for the epi...

The geometric and electric parameters of rock mass in the north-eastern section of the Baikal proving ground are determined. The methods are proposed for processing and interpreting the data of long-term measurements of active electromagnetic monitoring. The basic regularities of change in the electric parameters of time series are revealed. The se...

Electromagnetic methods with artificial field excitation are widely applied for studying the rock mass structure. Geometric and electric parameters of rock mass at north-east area of Baikal test ground have been determined by these methods. Ways for processing and interpretation of data of multiyear measurements have been offered. The main regulari...

In 1950s of the twentieth century, extensive geophysical prospecting was carried out in the region of Baikal Rift Zone with the aim to investigate the deep depression structure. The basic method of geophysical exploration was vertical electrical sounding (VES). At that time, the sufficiently complicated structure of the section gave no way of deter...

A geoelectric model of the Chuya basin has been constructed on the basis of an extensive collection of TEM data obtained in the 1970-80s. The experimental data were interpreted by solving inverse problems using the ERA and SONET computer systems. The modeling imaged the deep structure of the basin and provided a more exact idea of the thickness of...