Array magnetotelluric soundings in the active seismic area of Northern Tien Shan

Рыбин, А. В.; Spichak, Viacheslav V.; Batalev, V. Yu.; Баталева, Е. А.; Matyukov, V. E.

doi:10.1016/j.rgg.2007.09.014

Cited by 20 publications

(13 citation statements)

References 4 publications

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“…1 -Научная станция РАН; 2 -пункты зондирования детализационных профилей МТЗ [Rybin et al, 2008]; 3 -основные разрывные нарушения; 4 -крупные населенные пункты;…”

Section: полигонаunclassified

“…Исследования, проводимые на прогностических полигонах, таких как Гармский [Barsukov, Sorokin, 1973;Avagimov et al, 1988], Бишкекский (рис. 1) [Bragin et al, 1990[Bragin et al, , 1992Bragin, 2001;Rybin et al, 2008Rybin et al, , 2011Bataleva et al, 2013Bataleva et al, , 2014Safronov et al, 2004], Южно-Байкальский [Nevedrova, Epov, 2012;Moroz et al, 2006Moroz et al, , 2007 и другие [Lu et al, 1999;Park et al, 1993;Ernst et al, 1993;Stanica D., Stanica M., 2007], позволили установить устойчивую взаимосвязь между изменениями электромагнитных параметров и сейсмическими событиями. Согласно современным представлениям о напряженно-деформированном состоянии земной коры и сейсмотектоническом процессе, вариации Рис.…”

Section: Introductionunclassified

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Complex Electromagnetic Monitoring of Geodynamic Processes in the Northern Tien Shan (Bishkek Geodynamic Test Area)

Баталева¹,

Мухамадеева²

2018

Geodin. tektonofiz.

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At the Bishkek geodynamic test area in the Northern Tien Shan, complex electromagnetic monitoring was conducted, including a wide frequency range by magnetotelluric sounding in various modifications and induction sounding with a controlled impulse source (method of sounding in the far zone, SFZ). The geoelectrical sections of the lithosphere were constructed for the study area. Based on the geophysical monitoring data and the profile MT monitoring data on the Baitik depression, the main faults belonging to the Northern Tien Shan fault system were detected: Shamsi-Tyundyuk (Predkirgizsky), Baitik, Chonkurchak, and Issyk-Ata. From the geoelectrical data, we obtained new information that is independent of other geophysical methods used for studying the deep structure of the Earth-the hidden fault structures and the geoelectrical segmentation of the study area were revealed. The latter reflects the main elements of the block structure of the junction zone of the Chuya basin and the Kirghiz ridge. This information needs to be taken into account when constructing a comprehensive model showing the geological, geophysical and geodynamical features of the development of the Tien Shan, a vivid example of an intracontinental orogen. The MTS, FS and SFZ data from the Ak-Suu and Chon-Kurchak electromagnetic monitoring stations were interpreted. Based on the representative array of experimental electromagnetic data, we analyzed the effective depths of field penetration, which are most sensitive to changes in the electromagnetic parameters of the medium for the stationary and routine observation sites with respect to the clusters of seismic events. This paper discusses the development of the azimuth MT monitoring technique and the analysis of the time series of electromagnetic parameters, which were used for determining the contribution of each component of the impedance tensor to the informativeness of the monitoring studies. The data from the 2004-2016 KNET Catalogue of the Research Station of RAS were analyzed in order to investigate the relationship between the space-time seismicity distribution and the electrical conductivity variations that correspond to the features of the seismicity pattern at depth. Examples discussed are the time-frequency series of MT monitoring in 2007 and 2016 at the Ak-Suu and Chon-Kurchak stations that identified anomalous electromagnetic parameters corresponding to the fluid redistribution model for the pore-cracked medium: syn-phase decreasing and increasing values of the parameter by the orthogonal azimuths. Thus, a phenomenological model has been tested. It relates the change in the stress-strain state of the medium with the redistribution of fluids between the systems of fractures, which causes variations in the active and reactive components of the electrical resistance.

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Section: полигонаunclassified

Section: Introductionunclassified

Complex Electromagnetic Monitoring of Geodynamic Processes in the Northern Tien Shan (Bishkek Geodynamic Test Area)

Баталева¹,

Мухамадеева²

2018

Geodin. tektonofiz.

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“…The seismic catalogue we use is the one provided by USGS (United States Geological Survey, https://earthquake.usgs.gov/earthquakes/ search/) in the period 30 June 2014-1 January 2016 (in accordance with our electric data and taking also under consideration the lead time of SES) and in the area [40][41][42][43][44] • N, 72-78 • E. In Table 2, we give all earthquakes with magnitude M4.9 or larger in this area. To judge which of these seven earthquakes tabulated may justify the appearance of SES, we rely on the rules emerged from the long term experimentation in Greece during 1980s and 1990s.…”

Section: The Earthquakes Possibly Preceded By Sesmentioning

confidence: 99%

Study of Geo-Electric Data Collected by the Joint EMSEV-Bishkek RS-RAS Cooperation: Possible Earthquake Precursors

Papadopoulou

Skordas

Zlotnicki

et al. 2018

Entropy

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By employing the cross-correlogram method, in geo-electric data from the area of Kyrgyzstan for the period 30 June 2014-10 June 2015, we identified Anomalous Telluric Currents (ATC). From a total of 32 ATC after taking into consideration the electric current source properties, we found that three of them are possible Seismic Electric Signal (SES) activities. These three SES activities are likely to be linked with three local seismic events. Finally, by studying the corresponding recordings when a DC alternating source injects current into the Earth, we found that the subsurface resistivity seems to be reduced before one of these three earthquakes, but a similar analysis for the other two cannot be done due to their large epicentral distance and the lack of data.

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“…A number of EM soundings in the region of Bishkek geodynamic ground were carried out (see, for instance, Trapeznikov et al, 1997;Berdichevsky et al, 2001;Rybin et al, 2008). As to the electrical properties of rocks, the cross-section of the Chu depression was studied best by parametric soundings in a series of wells.…”

Section: Em Soundingsmentioning

confidence: 99%

Estimation of the Deep Temperature Distribution in the Chu Depression (Northern Tien Shan)

Spichak¹,

Zakharova²

2015

Electromagnetic Geothermometry

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Array magnetotelluric soundings in the active seismic area of Northern Tien Shan

Cited by 20 publications

References 4 publications

Complex Electromagnetic Monitoring of Geodynamic Processes in the Northern Tien Shan (Bishkek Geodynamic Test Area)

Complex Electromagnetic Monitoring of Geodynamic Processes in the Northern Tien Shan (Bishkek Geodynamic Test Area)

Study of Geo-Electric Data Collected by the Joint EMSEV-Bishkek RS-RAS Cooperation: Possible Earthquake Precursors

Estimation of the Deep Temperature Distribution in the Chu Depression (Northern Tien Shan)

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