NAILIA

@ifz.ru

Exploration Geophysics and Applied Geodynamics
SCHMIDT INSTITUTE OF PHYSICS OF THE EARTH OF THE RUSSIAN ACADEMY OF SCIENCES

NAILIA


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https://researchid.co/nelya_1957

EDUCATION

Tomsk Polytechnic Institute named after S.M. Kirov

RESEARCH, TEACHING, or OTHER INTERESTS

Earth and Planetary Sciences, Geophysics, Geophysics, Geophysics
35

Scopus Publications

Scopus Publications

  • Analysis of Tectonic Earthquakes and Industrial Explosions from the Point of Non-extensive Statistical Physics
    V. N. Sychev, N. A. Sycheva
    Springer Proceedings in Earth and Environmental Sciences, 2026
  • Crustal Stress State of Crimea, Western Caucasus, and Their Water Area According to Seismological Data
    Yu. L. Rebetsky, N. A. Sycheva
    Izvestiya Atmospheric and Oceanic Physics, 2025
  • Tectonophysical Zoning of Active Faults in the Altai‒Western Sayan Region: Identification of Locations for Preparation of Strong Earthquakes
    Yu. L. Rebetsky, N. A. Sycheva
    Geotectonics, 2025
  • DISTRIBUTION OF REDUCED SEISMIC ENERGY AND STRESS DROP IN THE ALTAI-SAYAN SEISMOACTIVE REGION
    N. A. Sycheva, L. M. Bogomolov
    Geodynamics and Tectonophysics, 2025
    The data bank has been created to address the tensor of the seismic moment of earthquakes that occurred in the Altai-Sayan seismically active region in the period 1978–2025. The scalar seismic moment M0 for these events was already known from the CMT catalog. This paper presents estimates of the following dynamic parameters: source radius r, shear stress drop ∆σ, and reduced seismic energy ePR using a phenomenological approach based on previously obtained regression relationships between the source radius r and the scalar seismic moment M0. Stress drop and reduced seismic energy estimates have been obtained for 69 earthquakes with a magnitude MW 3.5–7.2. Thus, it allows to significantly expand the data bank on these earthquake parameters for the Altai-Sayan seismically active region. Maps have been drawn of the areally averaged estimates of stress drop and reduced seismic energy.
  • TECTONOPHYSICAL ZONING OF THE TIEN SHAN ACTIVE FAULTS – DETERMINISTIC STRONG EARTHQUAKE PREDICTION
    K. E. Abdrakhmatov, O. M. Beloslyudtsev, A. V. Vilyaev, A. T. Danabaeva, T. L. Ibragimova, et al.
    Geodynamics and Tectonophysics, 2025
    The January 23, 2024 М7.0 Wushi earthquake (China) put an end to the period of strong earthquake quiescence that had lasted for about 33 years in the Tien Shan. The risk of occurrence of new strong earthquakes in the coming years has been discussed among scientists. As a result of the conference on the basis of RS RAS in Bishkek in 2024, a team of the Russian, Kyrgyz, Kazakh and Uzbek seismologists, geophysicists and tectonophysicists has been formed to collaborate on a study of seismic prediction in the Tien Shan to reach a new level of understanding of this problem and to obtain the possibility to solve it. In the last few decades, a large Tien Shan earthquake database has been compiled and catalogued involving not only place, time and intensity of an event but also earthquake focal mechanisms. For the last years, M.V. Gzovsky laboratory of tectonophysics, IPE RAS, dealt with the development of new approaches which allow the stresses, extracted from the seismological database, to be recalculated into the Coulomb stresses on active faults. The recalculation experience showed that the fault zones with high Coulomb stresses can also be distinguished as more intensive seismic regime areas. Those are areas along which there is an occurrence of earthquakes, both moderate to strong and catastrophic (retrospective prediction for the 2008 Wenchuan and 2023 Pazarcik earthquakes). Thus, it becomes possible to perform tectonophysical zoning of faults which can be considered as a long-term earthquake prediction. The joint research program also involves a new level of development of approach to moderate-term earthquake prediction as applied to certain faults.
  • SEISMICITY AND CRUSTAL SEISMOTECTONIC DEFORMATIONS OF THE ANATOLIAN PLATE (TURKEY)
    N. А. Sycheva
    Geodynamics and Tectonophysics, 2024
    The paper deals with the study of seismicity and the crustal stress-strain state of Turkey whose tectonics is caused by relative movements of the African, Aegean, Arabian, Anatolian, Black Sea and Eurasian plates. Seismotectonic deformations (STD) were calculated using the approaches proposed by Yu.V. Riznichenko and S.L. Yunga. The distribution of seismicity, average annual STD rate (STD intensity), seismogenic rupture concentration parameter and the Tsallis parameter was plotted from the earthquake catalog data analysis (more than 300000 events for 1900–2022). The representative part includes the events with М≥2.5. The distribution of the above-mentioned parameters was calculated for a 0–40 km layer wherein most of the earthquakes are located. Deep-focus earthquakes occur at a depth to 170 km. The maximum annual number of earthquakes (more than 90) was recorded in Balikesir Province. Seismicity and STD intensity analysis was made on the periods of 1997–2009 and 2010–2022 for the western and eastern parts of Turkey and for the destructive February 6, 2023 earthquake area. The number of earthquakes recorded in the western part of Turkey (75 %) largely exceeds that recorded in the eastern part (25 %). In the period 2010–2022, there was an increase in the number of earthquakes in the eastern part of Turkey relative to the period 1997–2009, which made up 38 % of the total number of earthquakes. The studies of STD direction are based on the earthquake focal mechanism data (807 events for 1976–2023). STD intensity in the February 6, 2023 earthquake area, with regard to the February 6, 2023 earthquakes, is 1.34⋅10–6 year–1, and the background intensity for the entire period of observation (1900–2022) is –10–10 year–1. The STD maps show the diversity of deformation settings in the study area. Turkey is largely dominated by the horizontal shear mode (eastern and central parts). The extension mode manifests itself in the southwestern part. The western part of Turkey and the southern part of the East Anatolian fault zone are characterized by transtension mode. The Lake Van area is characterized by transpression mode. The shortening axis direction changes from sublatitudinal in the west of Turkey to submeridional in the east. STD tensors served as a base for plotting the distributions of the Lode – Nadai coefficient με and the vertical component. Based on the seismic and GNSS data, a comparison was made between the shortening and elongation axes directions.
  • RETROSPECTIVE MEDIUM-TERM FORECAST OF A CATASTROPHIC EARTHQUAKE IN TURKEY IN 2023 (02.06.2023, MW=7.7) USING THE LURR METHOD
    A. S. Zakupin, N. A. Sycheva
    Geodynamics and Tectonophysics, 2024
    Variations of the LURR (load-unload response ratio) earthquake medium-term forecasr parameter in combination with changes in seismotectonic deformation modes (STD) for the East Anatolian fault region, where catastrophic earthquakes occurred in February 2023 (06.02.2003, MW=7.8, 06.02.2003, MW=7.6) are considered. The depth of the earthquake catalog for the LURR method calculations was equal to 23 years, and estimates of STD modes were possible received since 1976. Calculations have shown satisfactory results in detecting LURR anomalies before strong earthquakes. Almost half of the anomalies occurred in the one and a half year period before the doublet, and are unambiguously associated as precursors. The precursors were recorded by two series of LURR parameter anomalies in 2021 and 2022, and the calculation areas in which they were recorded compactly cover the East Anatolian fault, including the epicenters of the earthquakes on February 6, 2023. The results of calculations using the LURR method were compared with the reconstruction data using the STD method. As a result, it was possible to build the dynamics of the earthquake preparation process in its final part – from the appearance of the LURR anomaly to the earthquake. At the same time, the period before the appearance of anomalies (since the 1976) was also taken into account. It is shown that during the period of abnormal LURR behavior (the forecast period), the most significant changes in the geodynamic regime were observed, as well as a sharp increase in total seismic activity.
  • Solar Flares, Strong Magnetic Storms, and Variations in the Level of Seismic Noise in the Northern Tien Shan
    N. A. Sycheva
    Izvestiya Atmospheric and Ocean Physics, 2022
  • SOME CHARACTERISTICS OF THE EARTHQUAKE CATALOG AND THE SEISMIC PROCESS ACCORDING TO THE KNET NETWORK
    N. A. Sycheva
    Geodynamics and Tectonophysics, 2022
    Some characteristics of the earthquake catalog and seismic process are considered. The catalog is obtained according to the KNET network (KN-code in FSDN, International Federation of Digital Seismograph Networks, that is operated by Research Station of RAS, RS RAS) and contains more than 10000 earthquake parameters from 1994 to 2020. The catalog and seismicity characteristics were determined the whole catalog as well as the catalog that is limited by the coordinates of the Bishkek geodynamic polygon (BGP). Statistical analysis of arrival times of direct P- and S-waves registered at KNET network stations was carried out. The maximum P- and S-waves were registered at AAK station, the minimum – at ULHL station. The territory of the BGP is covered by great P-traces density. We analyzed earthquake localization errors, i.e. the difference between the observed and calculated arrival times of P-and S-wave fronts (RMS), horizontal error (ERH, epicenter) and vertical error (ERZ, depth). Occurred on the BGP territory earthquakes have minimum values of the considered errors. The representative sample is defined: for the whole catalog it includes K≥7.2 earthquakes and for the limited by BGP coordinates catalog – K≥6.7. Statistical characteristics of the representative part of the catalog in terms of time and depth are determined. The temporal distribution of earthquakes by energy classes is constructed and the absence of positive or negative trends in the number of events is noted. Spatial distribution of earthquakes by depth – 0–5, 5–10, 10–15 and more than 15 km is constructed. The smallest errors of earthquake depth determination have the events that occurred on the BGP territory. During the study 46 moderate earthquakes with K≥12 occurred. The most part of these events happened in the North Tien Shan seismgenic zone. 22 events were determined with K≥10 followed by aftershock sequences and give some aftershock characteristics. The most events with aftershocks occurred in the eastern part of the Kyrgyz ridge. The distribution of earthquake numbers and STD intensity is constructed. Zones of seismic activity and maximum intense Earth’s crust deformation are identified. The Gutenberg – Richter law and provisions of nonextensive statistical physics were used to describe the energy distribution function of earthquakes.
  • Modified data on geoeffective solar flares and seismic noise variations
    N A Sycheva, L M Bogomolov
    Iop Conference Series Earth and Environmental Science, 2021
    The problem of the relationship between strong magnetic swarms caused by solar flares and variations in seismicity is considered. The data on the temporal dependences of the parameters of seismic noise (average level, and standard deviation, RMS) recorded by the stations of the KNET seismic network have been used as the output data of monitoring the territory of the Bishkek geodynamic proving ground (Northern Tien Shan). The signatures of the influence of a magnetic swarm that occurred after an ultra-strong solar flare on September 6, 2017 have been established. The results obtained on the increase in seismic noise after this super-strong eruptive event are consistent with the results of studies on the influence of magnetic swarms on changes in regional seismicity.
  • Crustal Seismotectonic Deformations in Central and Western Tien-Shan
    N. A. Sycheva
    Journal of Volcanology and Seismology, 2021
  • Nonextensive Analysis of Aftershocks Following Moderate Earthquakes in Tien Shan and North Pamir
    V. N. Sychev, N. A. Sycheva
    Journal of Volcanology and Seismology, 2021
  • Analysis of the seismic process of the Bishkek geodynamic test site (Northern Tien Shan)
    Vladimir Sychev, Naylya Sycheva
    E3s Web of Conferences, 2020
  • A Study of Seismic Noise Level at the KNET Stations
    N. A. Sycheva, I. V. Sychev, A. N. Mansurov, S. I. Kuzikov
    Journal of Volcanology and Seismology, 2020
  • Seismotectonic deformation of the lithosphere in the pamir and adjacent territories
    N. A. Sycheva, A. N. Mansurov
    Geodynamics and Tectonophysics, 2020
  • Tectonophysical study of the verkhovoi fault activity on the northern slope of the Kyrgiz ridge
    Yu. L. Rebetsky, A. V. Marinin, S. I. Kuzikov, N. A. Sycheva, V. N. Sychev
    Geodynamics and Tectonophysics, 2020
  • Seismotectonic deformations of earth crust in Pamir and neighbor areas
    N A Sycheva, A N Mansurov
    Iop Conference Series Earth and Environmental Science, 2019
  • Analysis of seismic noise level at high-mountain stations of the KNET network
    N A Sycheva, A N Mansurov
    Iop Conference Series Earth and Environmental Science, 2019
  • The earthquakes aftershock processes of the Tien Shan and its surrounding area
    V N Sychev, N A Sycheva
    Iop Conference Series Earth and Environmental Science, 2019
  • Electromagnetic soundings of the earth crust and deformation processes in geosphere of the Bishkek geodynamic polygon (BGP)
    V N Sychev, L M Bogomolov, N A Sycheva
    Iop Conference Series Earth and Environmental Science, 2019
  • Collisional Processes in the Crust of the Northern Tien Shan Inferred From Velocity and Attenuation Tomography Studies
    Ilya V. Sychev, Ivan Koulakov, Nailia A. Sycheva, Alexander Koptev, Irina Medved, et al.
    Journal of Geophysical Research Solid Earth, 2018
  • Comparison of crustal deformation rates estimated from seismic and GPS data on the Bishkek geodynamic polygon
    N. A. Sycheva, A. N. Mansurov
    Geodynamics and Tectonophysics, 2017
  • Patterns of stress drop in earthquakes of the Northern Tien Shan
    N.A. Sycheva, L.M. Bogomolov
    Russian Geology and Geophysics, 2016
  • The stress state of the northern Tien Shan crust based on the KNET seismic network data
    Yu.L. Rebetsky, N.A. Sycheva, V.N. Sychev, S.I. Kuzikov, A.V. Marinin
    Russian Geology and Geophysics, 2016
  • Stress drop in the sources of intermediate-magnitude earthquakes in northern Tien Shan
    N. A. Sycheva, L. M. Bogomolov
    Izvestiya Physics of the Solid Earth, 2014
  • The pattern of the paleo- and present-day stresses of Northern Tien Shan
    L. A. Sim, N. A. Sycheva, V. N. Sychev, A. V. Marinin
    Izvestiya Physics of the Solid Earth, 2014
  • Development of inversion methods on fault slip data. Stress state in orogenes of the Central Asia
    Yu.L. Rebetsky, O.A. Kuchai, N.A. Sycheva, R.E. Tatevossian
    Tectonophysics, 2012
  • On geoeffective solar flares and variations of the seismic noise level
    N. A. Sycheva, L. M. Bogomolov, V. N. Sychev
    Izvestiya Physics of the Solid Earth, 2011
  • Dynamics of interaction between fields of seismicity and surface deformations (Bishkek Geodynamic Test Area)
    G. A. Sobolev, N. A. Zakrzhevskaya, K. N. Akatova, V. G. Gitis, A. B. Derendyaev, et al.
    Izvestiya Physics of the Solid Earth, 2010
  • Deformation of the Earth's crust in the Northern Tien Shan according to the earthquake focal data and satellite geodesy
    A. D. Kostyuk, N. A. Sycheva, S. L. Yunga, L. M. Bogomolov, Y. Yagi
    Izvestiya Physics of the Solid Earth, 2010
  • The effect of crossed electric and magnetic fields in loaded rock specimens
    A.S. Zakupin, L.M. Bogomolov, N.A. Sycheva
    Materials Science and Engineering A, 2009
  • Use of information technologies in calculation and mapping seismotectinic deformations in seismically active regions
    Wmsci 2008 the 12th World Multi Conference on Systemics Cybernetics and Informatics Jointly with the 14th International Conference on Information Systems Analysis and Synthesis Isas 2008 Proc, 2008
  • Seismotectonic deformations and recent tectonics of the Tien Shan
    N. A. Sycheva, S. L. Yunga, L. M. Bogomolov, V. I. Makarov
    Izvestiya Physics of the Solid Earth, 2008
  • Diurnal periodicity of weak earthquakes in Central Asia
    V. I. Zhuravlev, A. A. Lukk, K. M. Mirzoev, N. A. Sycheva
    Izvestiya Physics of the Solid Earth, 2006
  • Determination of seismotectonic crustal strains in the North Tien Shan using focal mechanisms from data of the KNET digital seismic network
    Izvestiya Physics of the Solid Earth, 2005