On the dynamics of the electromagnetic parameters of the Northern Tien Shan lithosphere

The results of geophysical monitoring of seismically hazardous regions are of undoubted interest for studying the deep structure of the lithosphere, regional seismicity, modern geodynamics, etc. The work used experimental material, including the results of magnetotelluric monitoring and the catalogs of the KNET (Kyrgyzstan Telemetered Network), KRNET (Kyrgyz Republic Digital Network) and ISC (International Seismological Center) networks obtained in the seismically active zones of the Bishkek Geodynamic Proving Ground (Northern Tien Shan). The analysis of electromagnetic monitoring results of the Northern Tien Shan seismic generating zone was carried out in a wide frequency range. The data on the parameters of the electromagnetic field of the Earth’s crust in the Northern Tien Shan are generalized and systematized. Based on the analysis of these data, the dependence of the response of seismic events in electromagnetic parameters on the distance of earthquake epicenters was studied. The most likely reason for the occurrence of anomalous changes in the electromagnetic field is the activation of deformation processes during the preparation of strong earthquakes. The results of the time-frequency analysis are presented and the features of manifestation are considered depending on the location of the hypoand epicenters of seismic events and their magnitude. Regularities have been established in the behavior of tipper variations for remote and regional earthquakes for the first quarter of 2016 with an energy class from 6 to 10.

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On the relationship of the extrema of lunar-solar tidal influences and seismic events

E3S Web of Conferences ◽

10.1051/e3sconf/202019602022 ◽

2020 ◽

Vol 196 ◽

pp. 02022

Author(s):

Elena Bataleva ◽

Ksenia Nepeina

Keyword(s):

Experimental Data ◽

Tien Shan ◽

Seismic Events ◽

Geological Environment ◽

Tidal Effects ◽

Seismic Regime ◽

Time Frequency ◽

Relationship Of ◽

The Relationship ◽

Northern Tien Shan

The paper considers experimental data obtained at stationary and regime points of magnetotelluric monitoring on the territory of the Bishkek geodynamic proving ground (Northern Tien Shan). The studies performed indicate the relationship of variations in the electromagnetic and seismic fields, lunar-solar tidal effects, seismic regime with the processes of fracturing. The results of the time-frequency analysis of the response of the geological environment to earthquakes in the electromagnetic field are presented, the features of manifestation depending on the location of the hypo-and epicenters of seismic events and their magnitude are considered. A number of responses in geophysical fields to remote and regional earthquakes of 2010-2020 with an energy class from 8 to 12 and their relationship with the extremes of lunar-solar tidal effects are considered.

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Features of the manifestation of lunar-solar tides in the electromagnetic parameters of the active fault zones of the Tien Shan

E3S Web of Conferences ◽

10.1051/e3sconf/202019603003 ◽

2020 ◽

Vol 196 ◽

pp. 03003

Author(s):

Elena Bataleva

Keyword(s):

Electromagnetic Field ◽

Cross Correlation ◽

Active Fault ◽

Active Faults ◽

Temporal Variations ◽

Fault Zones ◽

Tien Shan ◽

Tectonic Activity ◽

Electromagnetic Parameters ◽

Fault Structures

The results of monitoring studies of the electromagnetic parameters of active fault structures on the territory of the Bishkek geodynamic proving ground are shown. The temporal variations of the electromagnetic field on several active faults of the Earth’s crust, characterized by different tectonic activity, are analyzed in comparison with the variations of lunar-solar tides. It was found that in the overwhelming majority of cases, the correlation dependences are most clearly manifested in changes in the real and imaginary parts of additional impedances than the main ones. Analysis of the cross-correlation function indicates that the reason for the change in the parameters of the electromagnetic field can be lunar-solar tides.

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Modified data on geoeffective solar flares and seismic noise variations

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/929/1/012033 ◽

2021 ◽

Vol 929 (1) ◽

pp. 012033

Author(s):

N A Sycheva ◽

L M Bogomolov

Keyword(s):

Standard Deviation ◽

Solar Flare ◽

Solar Flares ◽

Seismic Noise ◽

Tien Shan ◽

Output Data ◽

Regional Seismicity ◽

Eruptive Event ◽

The Relationship ◽

Northern Tien Shan

Abstract 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.

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KAZAKHSTAN

Zemletriaseniia Severnoi Evrazii [Earthquakes in Northern Eurasia] ◽

10.35540/1818-6254.2019.22.11 ◽

2019 ◽

pp. 131-138 ◽

Cited By ~ 4

Author(s):

N. Neverova ◽

N. Mikhailova ◽

Inna Sokolova

Keyword(s):

Urban Areas ◽

Seismic Energy ◽

Focal Mechanisms ◽

Tien Shan ◽

Seismic Events ◽

Ministry Of Education ◽

Geophysical Research ◽

Seismic Arrays ◽

The Republic ◽

Northern Tien Shan

In 2013, seismic monitoring in Kazakhstan was conducted by two organizations: the Seismological Experience-Methodical expedition of the Ministry of Education and Science of the Republic of Kazakhstan (SEME), and the Institute of Geophysical Research of the Ministry of Energy of the Republic of Kazakhstan (IGR). The station network consists of three-component stations and seismic arrays. The work presents detailed information on seismic observation networks. The catalogue of seismic events of Kazakhstan is made by da-ta of above mentioned Organizations. It includes 1036 earthquakes with energy class КР=6.6–14.7. The catalog contains several additional sheets with Attachments: Microseismic data on felt earthquakes, parameters of focal mechanisms of 55 earthquakes, information on coordinates of 29 urban areas with felt shakes, parameters of 1123 aftershocks, and two forshocks of Saryzhas (Narynkol) earthquake in the range of energy classes КР=4.5–11.8. Two maps of earthquake epicenters are shown in the paper: for the whole Kazakhstan territory with КР≥8.6 and for Northern Tien Shan territory with КР≥6.6. The largest earthquake of the year was the Saryzhas earthquake that occurred in Northern Tien Shan on January 28, MS=6.0, КР=14.7. The earthquake was felt on the territory of Kazakhstan and China and was followed by numerous aftershocks. For the first day, only its number exceeded 500. It was noted that the total released seismic energy in 2013 exceeded significantly the same parameter of 2012.

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Grouping of strong earthquakes in Central Asia: New possibilities of medium-range forecast of seismic events in the northern Tien Shan region

Doklady Earth Sciences ◽

10.1134/s1028334x06080356 ◽

2006 ◽

Vol 411 (1) ◽

pp. 1324-1326 ◽

Cited By ~ 2

Author(s):

Yu. F. Kopnichev ◽

I. N. Sokolova

Keyword(s):

Central Asia ◽

Tien Shan ◽

Seismic Events ◽

Strong Earthquakes ◽

Medium Range Forecast ◽

Medium Range ◽

Northern Tien Shan

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Long- and Short-Term Monitoring of a Dam in Response to Seasonal Changes and Ground Motion Loading: The Test Case of the Kurpsai Dam, Western Kyrgyz Republic

Pure and Applied Geophysics ◽

10.1007/s00024-021-02861-5 ◽

2021 ◽

Author(s):

Marco Pilz ◽

Marius Paul Isken ◽

Kevin Fleming ◽

Sagynbek Orunbaev ◽

Bolot Moldobekov

Keyword(s):

Ground Motion ◽

Structural Response ◽

Strain Sensors ◽

Seismic Events ◽

Test Case ◽

Kyrgyz Republic ◽

Strain Measurements ◽

Time Frequency ◽

Modes Of Vibration ◽

Opening And Closing

AbstractAn experimental multi-parameter structural monitoring system has been installed on the Kurpsai dam, western Kyrgyz Republic. This system consists of equipment for seismic and strain measurements for making longer- (days, weeks, months) and shorter- (minutes, hours) term observations, dealing with, for example seasonal (longer) effects or the response of the dam to ground motion from noise or seismic events. Fibre-optic strain sensors allow the seasonal and daily opening and closing of the spaces between the dam’s segments to be tracked. For the seismic data, both amplitude (in terms of using differences in amplitudes in the Fourier spectra for mapping the modes of vibration of the dam) and their time–frequency distribution for a set of small to moderate seismic events are investigated and the corresponding phase variabilities (in terms of lagged coherency) are evaluated. Even for moderate levels of seismic-induced ground motion, some influence on the structural response can be detected, which then sees the dam quickly return to its original state. A seasonal component was identified in the strain measurements, while levels of noise arising from the operation of the dam's generators and associated water flow have been provisionally identified.

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Anamolous modulations of electromagnetic field during increased seismic activity

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/929/1/012024 ◽

2021 ◽

Vol 929 (1) ◽

pp. 012024

Author(s):

V A Mukhamadeeva

Keyword(s):

Electromagnetic Field ◽

Seismic Activity ◽

Tien Shan ◽

Geophysical Field ◽

Geomagnetic Observation ◽

Electromagnetic Monitoring ◽

Northern Tien Shan

Abstract The article presents the results of electromagnetic monitoring and geomagnetic observation during increased seismic activity in eastern part of Bishkek geodynamic range (Northern Tien-Shan) in 2017. It includes brief description of seismic conditions of the territory being researched, as well as analyses of the correlation between changes in geophysical field parameters and the earthquakes.

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STUDY OF THE DEPTH STRUCTURE OF SEISMICALLY ACTIVE ZONES BY THE METHOD OF MAGNETOTELLURIC SOUNDING

Interexpo GEO-Siberia ◽

10.33764/2618-981x-2021-1-137-143 ◽

2021 ◽

Vol 1 ◽

pp. 137-143

Author(s):

Elena A. Bataleva

Keyword(s):

Deep Structure ◽

Test Site ◽

Tien Shan ◽

Magnetotelluric Soundings ◽

Mountain Ranges ◽

Transition Zones ◽

Conductivity Anomalies ◽

Active Zones ◽

Intermontane Basins ◽

Northern Tien Shan

The paper presents the results of the analysis of data from magnetotelluric soundings performed in 2003-2020. A comparison of geoelectric models for the Chui and Kochkor basins of the Northern Tien Shan is shown. The main objective of the study is to identify patterns in the distribution of geoelectric inhomogeneities in the deep structure of the Bishkek geodynamic test site. Particular attention in geoelectric models was paid to the study of key objects of transition zones from mountain ranges to intermontane basins. The nature of crustal electrical conductivity anomalies is considered.

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