Methods and results of monitoring of the natural telluric field in the Baikal rift zone

Moroz, Yu. F.; Мороз, Т. А.; Mogi, Toru

doi:10.1134/s1069351307110043

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…8 that most of the earthquakes are preceded by anomalous perturbations in the elec tric field approximately 1.5-2 months before the event. Similar effects were also observed at Lake Baikal (Moroz, Moroz, and Mogi, 2007), where bay like variations attaining several hundreds mV/km were revealed in the electric field of terrestrial origin mea sured at the Tyrgan locality on the western shore of the lake. These variations were related to earthquakes with K > 12.…”

Section: The Analysis Of the Electric Field Of Terrestrial Sourcessupporting

confidence: 69%

“…Therefore, the intensity of the electrotelluric field during geomag netic storms will not exceed 22.5 mV/km. According to (Moroz et al, 1999;Moroz, Moroz, and Mogi, 2007), the intensity of low frequency variations (T = 1.5-2 months) caused by terrestrial sources is several hundreds of mV/km; further, we will discuss such anomalies in the electric field, which have a duration of 1-2 months and an intensity of a few hundred nT. Therefore, when considering the low frequency elec tric field of the Earth at periods longer than 9 days, we may ignore the variations caused by extraterrestrial sources.…”

Section: The Analysis Of the Electric Field Of Terrestrial Sourcesmentioning

confidence: 98%

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Correlation of the anomalies in the electric field and electric conductivity of the lithosphere to earthquakes in Kamchatka

Moroz

Мороз

2012

Izv., Phys. Solid Earth

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The data of long term electromagnetic monitoring are used for studying the dynamics of electric conductivity of the medium and the electric field of the terrestrial sources. The electric conductivity of the medium is estimated from the magnetotelluric transfer functions (impedance tensor and telluric tensor). The electric field of terrestrial sources is identified by filtering the variations of the observed electric field of the Earth. The magnetotelluric parameters and the electric field of terrestrial sources feature anomalous changes of supposedly earthquake related origin. The anomalies associated with the same earthquake are not simul taneous. It is shown that these anomalies are generated by processes occurring at different depths. The strong earthquake is preceded by the appearance of surface anomalies several months before the event and accom panied by a deep coseismic anomaly. The probable nature of the recognized anomalies is discussed.

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Section: The Analysis Of the Electric Field Of Terrestrial Sourcessupporting

confidence: 69%

Section: The Analysis Of the Electric Field Of Terrestrial Sourcesmentioning

confidence: 98%

Correlation of the anomalies in the electric field and electric conductivity of the lithosphere to earthquakes in Kamchatka

Moroz

Мороз

2012

Izv., Phys. Solid Earth

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“…Retrieval of this information is an important scientific problem. The anomalous varia tions in the electromagnetic field, which are related to the earthquakes, are discussed in a series of papers (Guglielmi and Zotov, 2010;Moroz and Napylova, 1993;Moroz, 1996;Moroz, Moroz, and Mogi, 2007;Rikitake, 1976;Sobolev and Morozov, 1970;Corwin and Morrison, 1977;Djedi et al, 2008;Nagao et al, 2000;Noritomi, 1978;Mogi et al, 2000;Alexopoulos, 1984: Varotsos, Alexopoulos, andLaz aridou, 1993). There is an uncertainty in identifying the anomalies that precede the earthquakes.…”

Section: Introductionmentioning

confidence: 98%

Anomalies in the electric field and electric conductivity of the Earth’s crust in relation to the Kultuk Earthquake on Lake Baikal

Moroz

Мороз

2012

Izv., Phys. Solid Earth

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We analyze the variations in the horizontal and vertical components of the Earth's electromag netic field measured at nine points onshore along the southern part of Lake Baikal. It is found that variations with a period of a few tens of seconds have decayed 20 minutes before the earthquake. This is a regional effect. It is observed in the variations of the horizontal magnetic field. The intensity of the effect in the electric field is site specific, which is due to the nonuniform distribution of electric conductivity in a medium, as revealed by the deep magnetotelluric sounding. The electric field also experiences a coseismic variation associated with the seismic wave. This effect is stronger pronounced in the vertical electric field. The bay like anomalies that precede and accompany the Kultuk earthquake are revealed in the electric field of intraterrestrial origin and in the behavior of the electric tipper. These anomalies are concurrent with the rise of the ground water level in the borehole. The probable nature of the revealed anomalies is discussed.

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“…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

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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Methods and results of monitoring of the natural telluric field in the Baikal rift zone

Cited by 6 publications

References 6 publications

Correlation of the anomalies in the electric field and electric conductivity of the lithosphere to earthquakes in Kamchatka

Correlation of the anomalies in the electric field and electric conductivity of the lithosphere to earthquakes in Kamchatka

Anomalies in the electric field and electric conductivity of the Earth’s crust in relation to the Kultuk Earthquake on Lake Baikal

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

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