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ON THE PROBLEM OF IDENTIFICATION OF POSSIBLE PRECURSORS OF STRONG SEISMIC EVENTS IN LOCAL VARIATIONS OF COMPONENTS OF THE VECTOR OF THE GEOMAGNETIC FIELD
Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Moscow, Russia
Journal: Geophysical research
Tome: 22
Number: 3
Year: 2021
Pages: 5-25
UDK: 550.344.385
DOI: 10.21455/gr2021.3-1
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Grigoryan A.G., Likhodeev D.V. ON THE PROBLEM OF IDENTIFICATION OF POSSIBLE PRECURSORS OF STRONG SEISMIC EVENTS IN LOCAL VARIATIONS OF COMPONENTS OF THE VECTOR OF THE GEOMAGNETIC FIELD // . 2021. Т. 22. № 3. С. 5-25. DOI: 10.21455/gr2021.3-1
@article{GrigoryanON2021,
author = "Grigoryan, A. G. and Likhodeev, D. V.",
title = "ON THE PROBLEM OF IDENTIFICATION OF POSSIBLE PRECURSORS OF STRONG SEISMIC EVENTS IN LOCAL VARIATIONS OF COMPONENTS OF THE VECTOR OF THE GEOMAGNETIC FIELD",
journal = "Geophysical research",
year = 2021,
volume = "22",
number = "3",
pages = "5-25",
doi = "10.21455/gr2021.3-1",
language = "English"
}
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Keywords: Earth's magnetic field, anomalous variations of the geomagnetic field, geodynamic processes, preparation of large seismic events, deep fluid-dynamic systems, regional seismicity
Аnnotation: Variations in the geomagnetic field (solar-diurnal, bay-like, etc.) caused by external sources, such as ionospheric currents in the E layer, currents flowing in the upper atmosphere, contain important information about geodynamic processes in the earth's crust. In order to estimate the change in the geological environment, the parameter N(A) was used – the ratio of the amplitudes of intensity variations of the geomagnetic field caused by an external source and measured synchronously at different stations. The calculated parameter N(A) makes it possible to estimate the spatial and temporal changes in the local response of the geomagnetic field as well as changes in electrical conductivity, to identify zones of most active development of the geodynamic process, and so to determine the areas of preparation of the foci of large earthquakes. It is shown that for the system of se-lected observation points in the Republic of Armenia, the changes in the parameter N(A) are mainly caused by the induced component of the geomagnetic field. Using bay-like variations with periods of 10–25, 25–60, 60–90 min as well as Sq variations for 1986–1993, anomalous changes in the local geomagnetic field were de-tected, reflecting the activation of various geodynamic processes at different depths of the earth's crust and upper mantle within the studied territory of the Republic of Armenia. The precursors of two strong earthquakes – the Paravan earthquake (M=5.3, 13.05.1986) and Spitak earthquake (M=7.0, 07.12.1988) were revealed. The method was also applied in the area of the Elbrus volcanic center at the Baksan and Kuban observation points. Bay-like variations with periods of 10–25, 25–60 min and Sq variations were studied for the period 2011–2013. Small values of the anomalies in the N(A) parameter indicate insignificant changes in the electromagnetic parameters in the area of observation points, which indicates weak variations in the fluid regime of the geological environment in the Elbrus volcano area and is confirmed by the data of other observations. Studies of local changes in the pa-rameter N(A) make it possible to control the processes in the geological environment associated with the stress-strain state and dynamics of the fluid regime. This is important for the search of precursors of earthquakes and volcanic eruptions.
Bibliography: Bezuglaya L.S., Prokhorov A.A., Skovorodkin Yu.P., Tonoyan E.P., The Use of Sq Variations for Studying the Seismotectonic Process, Dokl. Akad. Nauk Arm. SSR (Dokl. AN Arm. SSR), vol. 82, no. 1, pp. 33-37. [In Russian]. Dobrovolskii I.P., Mehanika podgotovki zemletriaseniia (Tectonic earthquake preparation mechanics), Moscow: IFZ AN SSSR, 1984, 189 p. [In Russian]. Gabrielian A.A., Sarkisian O.A., Simonian G.P., Seismotektonika Armianskoi SSR (Seismotectonics of the Ar-menian SSR), Erevan: Erevanskii` Universitet, 1981, 284 p. [In Russian]. Gabsatarova I.P., Borisov P.A., The modern consolidated catalog of earthquakes in the Caucasus: problems of creation and ways of improvement, in Sovremennye metody obrabotki i interpretatsii seismologicheskikh dannykh. Materialy XII Mezhdunarodnoi seismologicheskoi shkoly (Modern methods of processing and interpretation of seismological data. Materials of the XII International Seismological School), 2017. pp. 105-109. [In Russian]. Grigorian A.G., Abnormal changes in electromagnetic induction as a harbinger of strong earthquakes, in Geofizika XXI stoletiya: Sbornik trudov Sed'mykh geofizicheskikh chtenii im. V.V. Fedynskogo (Geophys-ics of the XXI century: Proceedings of the Seventh Geophysical Readings named after V.V. Fedynsky), Moscow: OOO “Izd-vo GERS”, 2005, pp. 198-205. [In Russian]. Grigorian A.G., Local geomagnetic field variations of external origin: A case study of Armenia, Izvestiya, Phys-ics of the Solid Earth, 2007, vol. 43, no. 6, pp. 88-95. Grigorian A.G., Nazaretyan S.N., Akhverdyan L.A., Oganesyan G.A., Spatiotemporal Variations in Electromag-netic Induction in the Crust and Upper Mantle of Armenia, in Trudy nauchnoi konferentsii, posvyashchen-noi 10-letiyu Spitakskogo zemletryaseniya, po problemam izucheniya zemletryasenii, Erevan, 27–28 okty-abrya 1998 g. Spets. Vypusk (Proceedings of the scientific conference dedicated to the 10th anniversary of the Spitak earthquake, on the problems of studying earthquakes, Yerevan, October 27-28, 1998 Special. Release), Yerevan: Izv. Nauki o Zemle NAN RA, 1999, vol. 4, pp. 28-29. [In Russian]. Grigorian A.G., Skovorodkin Yu.P., Magnetic Variation Monitoring in Armenia over the 1986–1988 Period, in Nauchno-prakticheskaya konferentsiya “Opyt kompleksnogo izucheniya geofizicheskikh polei dlya tselei seismoprognoza” 13–15 maya 1998 g. (Conf. Sci. Appl. Problems “Experience of Integrated Studies of Geophysical Fields in Relation to Seismic Prediction”. May 13–15, 1998), Moscow: Geoinformmark, 1998, pp. 39-40. [In Russian]. Grigorian A.G., Skovorodkin Yu.P., Akhverdian L.A., Study of geomagnetic precursors of strong earthquakes, Izv. Nauki o Zemle NAN RA (Erevan, 27-28 oktyabrya 1998 g.). Spets. vyp. (Izv. Earth Sciences NAS RA (Yerevan, October 27-28, 1998). Special. Release), 1999, no. 4, pp. 35-37. [In Russian]. Grigorian A.G., Skovorodkin Yu.P., Nazaretian S.N., Local geomagnetic field changes and seismicity of Arme-nia for 1981–1993, in Proceedings Third International Conference on seismology and earthquake engi-neering, Section 3, May 17–19, 1999, 1999, vol. I, pp. 229-234. Gufeld I.L., Geological consequences of amorphization of the structure of the lithosphere and upper mantle caused by hydrogen degassing, Geodinamika i tektonofizika (Geodynamics and Tectonophysics), 2012, vol. 3, no. 4, pp. 417-435. [In Russian]. Kanonidi K.Kh., Kanonidi Kh.D., Petrov V.G., Development of a geomagnetic observation network, in Elektro-magnitnye i plazmennye protsessy ot nedr Solntsa do nedr Zemli. Yubileinyi sbornik IZMIRAN-75 (Electromagnetic and plasma processes from the interior of the Sun to the interior of the Earth. Jubilee col-lection IZMIRAN-75), 2015, pp. 77-87. [In Russian]. Kissin I.G., Flyuidy v zemnoi kore: Geofizicheskie i tektonicheskie aspekty (Fluids in the Earth's Crust: Geo-physical and Tectonic Aspects), Moscow: Nauka, 2015, 328 p. [In Russian]. Kissin I.G., Influence of fluid systems of the consolidated crust on degassing of the earth and oil formation, Dok-lady Earth Sciences, 2011, vol. 440, no. 1, pp. 1202-1206. Likhodeev D.V., Dudarov Z.I., Zhostkov R.A., Presnov D.A., Dolov S.M., Danilov K.B., Studying the Deep Structure of Elbrus Volcano by Microseismic Sounding, Journal of Volcanology and Seismology, 2017, vol. 11, no. 6, pp. 413-418. Malovichko A.A., Gabsatarova I.P., Likhodeev D.V., Zaklyukovskaya A.S., Presnov D.A., Development of Multiscale Seismic Monitoring System in the Elbrus Volcano Region, Seismic Instruments, 2015, vol. 51, no. 3, pp. 259-266. Nazaretiaan S.N., Durgarian R.R., Mirzoian L.B., Grigorian A.G., Shakhbekian T.A., Regional'nye razlomy ter-ritorii Armenii po geofizicheskim dannym i ikh seismichnost' (Regional faults of the territory of Armenia according to geophysical data and their seismicity), Erevan: Izd-vo “Gitutyun” NAN RA, 2015, 184 p. [In Russian]. Nechaev Yu.V., Lineamenty i tektonicheskaya razdroblennost': Distantsionnoe izuchenie vnutrennego stroeniya litosfery (Lineaments and tectonic fragmentation: Distance learning of the internal structure of the litho-sphere), Moscow: IFZ RAN, 2010, 215 p. [In Russian]. Rokitianskii I.I., Kulik S.N., Logvinov I.M., Rokitianskaia D.A., Anomalies of geomagnetic variations in the northwest of the European part of the USSR, Izvestiya AN SSSR (Izvestia Academy of Sciences of the USSR. Physics of the Earth), 1982, no. 11, pp. 101-105. [In Russian]. Skovorodkin Yu.P., Izuchenie tektonicheskikh protsessov metodami magnitometrii (Study of tectonic processes using magnetometry methods), Moscow: IFZ AN SSSR, 1985, 197 p. [In Russian]. Skovorodkin Yu.P., Grigoryan A.G., Magnetic variation monitoring in the territory of Armenia for 1986-1988, in Nauchno-prakticheskaya konferentsiya “Opyt kompleksnogo izucheniya geofizicheskikh polei dlya tse-lei seismoprognoza”, 13–15 maya 1998 g. (Scientific-practical conference “Experience in the complex study of geophysical fields for seismic forecasting”, May 13-15, 1998), Moscow: Geoinformmark, 1998, 39 p. [In Russian]. Skovorodkin Yu.P., Tonoyan E.P., Temporary changes in electromagnetic induction at prognostic test sites, Seismicheskii monitoring zemnoi kory (Seismic monitoring of the earth's crust), Moscow: IFZ AN SSSR, 1986, pp. 199-203. [In Russian]. Skovorodkin Yu.P., Guseva T.V., Bezuglaya L.S., Tonoyan E.P., Issledovanie geomagnitnykh variatsii s tsel'yu izucheniya geodinamiki i glubinnogo geologicheskogo stroeniya v seismoopasnykh zonakh Tadzhikskoi SSR (Study of Geomagnetic Variations in Relation to Geodynamics and Deep Geological Structure in Seismically Hazardous Zones of the Tajik SSR), Moscow: IFZ AN SSSR, 1985, 60 p. [In Russian]. Sobisevich A.L., Izbrannye zadachi matematicheskoi geofiziki, vulkanologii i geoekologii. T. 2. Severo-kavkazskaya geofizicheskaya observatoriya. Sozdanie, analiz rezul'tatov nablyudenii (Selected Problems on Mathematical Geophysics, Volcanology, and Environmental Geology, vol. 2: North Caucasian Geo-physical Observatory. Foundation, Analysis of Monitoring Results), Moscow: IFZ RAN, 2013, 288 p. [In Russian]. Sobisevich A.L., Sobisevich L.E., Kanonidi K.Kh., Likhodeev D.V., Gravimagnetic Perturbations Preceding Earthquakes, Doklady Earth Sciences, 2017, vol. 475, no. 2, pp. 891-894. Sobolev G.A., Osnovy prognoza zemletryasenii (Basics of earthquake prediction), Moscow: Nauka, 1993, 344 p. [In Russian]. Vanyan L.L., Hindman R.D., On the Origin of Electrical Conductivity in the Consolidated Crust, Izvestiya. Physics of the Solid Earth, 1996, vol. 32, no. 4, pp. 266-271. Yamazaki Y., Rikitake T., Local anomalous chandes in the geomagnetic field at Matsushirc, Bull. Earthq. Res. Inst. Univ. Tokyo, 1970, vol. 48, p. 637-643. Yanovsky B.M., Zemnoi magnetism. Tom I (Terrestrial magnetism. Vol. I), Leningrad: LGU, 1964, 445 p. [In Russian]. Yanovsky B.M., Zemnoi magnetizm (Terrestrial magnetism), Leningrad: LGU, 1978, 482 p. [In Russian].
