ASSESSMENT OF THE GEOENVIRONMENT STRESS STATE AT THE CAUCASIAN MINERAL WATERS TEST PLOT USING LONG-TERM SEISMIC-ECOLOGICAL MONITORING
© 2019 O. G. Popova^1,*, M. G. Popov^2,**

¹Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences,
Ulanskii per., 13, str. 2, Moscow, 101000 Russia
^*E-mail: oksana-p@list.ru

²Geological Faculty, Lomonosov Moscow State University,
Vorob'evy Gory, 1, Moscow, 119899 Russia
^**E-mail: mgpopov@list.ru

According to the results of continuous long-term seismic-ecological monitoring at the Cauca­sian Mineral Waters test plot (the seismic zone in the Cis-Elbrus region), data on the seismic veloci­ty distribution pattern were obtained for the test plot territory. The high-speed structure is revealed, the horizontal dimensions of which do not allow predicting local earthquakes with a very high magni­tude in this territory. Three-dimensional models of anisotropy index y were obtained and the indexes of stress state S were estimated for different depths according to the interpretation results of converted PS waves from distant earthquakes. It is found that the distribution of the anisotropy index y varies continuously by the depth, by the laterals and in time. The cyclic changes in the index S with time are noted for all depths.

Keywords: anisotropy, stress state, geoenvironment, seismic-ecological monitoring, microseismic back­ground, distant catastrophic and local earthquakes, gradient zones of high-speed structures.

DOI: https://doi.org/10.31857/S0869-78092019515-22

REFERENCES

1. Gamburtsev, A.G. Seismicheskii monitoring litosfery [Seismic monitoring of the lithosphere]. Moscow, Nauka, 1982, 200 р. (in Russian)

2. Dobrovolskii, I.P. Teoriya podgotovki tektonicheskogo zemletryaseniya [Theory of preparation of a tectonic earthquake]. Moscow, IFZ AN SSSR, 1991, 216 p. (in Russian)

3. Egorkin, A.V. Stroenie zemnoi kory po seismicheskim geotraversam [The structure of the Earth crust by the seismic geotraverses]. Glubinnoe stroenie territorii SSSR [Deep structure of the USSR territory]. V.V. Belousov, N.I. Pavlenkova, and G.I. Kvetkovskaya, Eds. Moscow, Nauka, 1991, pp. 118-135. (in Russian)

4. Koronovskii, N.V., Demina, L.N. Kollizionnyi etap razvitiya Kavkazskogo sektora Al'piiskogo skladchatogo poyasa: geodinamika i magmatism [Collision develop­ment stage of the Caucasian sector of the Alpine fold­ed belt: geodynamics and magmatism]. Geotektonika, 1999, no. 2, pp. 17-35. (in Russian)

5. Krylov, S.V., Mishen'kin, B.P., Mishen'kina, Z.R. Detal'nye seismicheskie issledovaniya litosfery na P i S volnakh [Detailed seismic research of the lithosphere on P and S waves]. Novosibirsk, Nauka, 1993, 199 p. (in Russian)

6. Milanovskii, E.E., Rastsvetaev, A.V., Kukhmazov, S.U., Birman, A.S., etc. Noveishaya geodinamika El'brussko-Mineralovodskoi oblasti Severnogo Ka- vkaza [The newest geodynamics of the Elbrus and Mineralnye Vody region in the North Caucasus]. Ge- odinamika Kavkaza [Geodynamics of the Caucasus]. Moscow, Nauka 1989, pp. 99-105. (in Russian)

7. Popova, O.G., Konovalov, Yu.F., Popov, M.G. Oso- bennosti struktury zemnoi kory seismoopasnykh i aseismichnykh regionov po dannym geotraversov (na primere profilei Baza'lt, Rubin, Kvarts i Armash-Akhaltsikhe) [Features of crust structure in seismic and aseismic regions according to geotraverses (by the example of the Basalt, Rubin, Quartz and Armash-Akhaltsikhe profiles). Vulkanologiya i seismologiya, 1998, no. 4-5, pp. 178-189. (in Russian)

8. Popova, O.G., Seryi, A.V., Konovalov, Yu.F., Nedy- ad'ko, V.V. Vliyanie katastroficheskikh zemletryasenii na napryazhennoe sostoyanie sredy udalennykh territorii [Influence of catastrophic earthquakes on the stress state of the environment in remote areas]. Geo­physics of the XXI century: 2006. Proc. 8th Geophys­ical V.V. Fedynskii Conference. Moscow, 2007, pp. 200-204 (in Russian)

9. Popova, O.G., Seryi, A.V., Konovalov Yu.F. Re- zul'taty dolgovremennogo seismicheskogo monitoring v seismoopasnom raione Kavkazskikh Mineral'nykh Vod [Results of long-term seismic monitoring in the seismic-prone region of Caucasus Mineral Waters]. Geoekologiya, 2008, no. 2, pp. 135-140. (in Russian)

10. Popova, O.G., Popov, M.G., Arakelyan, F.O., Nedy- adko, V.V., Vasyutinskaya, S.D. Osnovnye rezul'taty po lokal'nomy seismoekologicheskomy monitoring v raznykh regionakh Rossiiskoi Federatsii [The main re­sults on local seismic-ecological monitoring in differ­ent regions of the Russian Federation]. Geoekologiya, 2016, no. 6, pp. 483-496. (in Russian)

11. Popova, O.G., Makeev, V.M., Popov, M.G., Arakely­an, F.O., Nedyadko, V.V. Geodinamicheskoe sostoyanie sredy territorii planiruemykh i desitvuyushchikh atomnykh elektrostantsii, raspolozhennykh v raznykh tektonicheski aktivnykh oblastyakh [Geodynamic state of the environment in the areas of planned and operating nuclear power plants, located in different tectonically active areas]. Geologiya i geofizika Yuga Rossii, 2017, no. 4, pp. 99-108. (in Russian)

12. Popova, O.G., Makeev, V.M., Popov, M.G., Arakely­an, F.O., Nedyadko, V.V. Otsenka geodinamiki platformennykh territorii po rezul'tatam seismoekologicheskogo monitoring [Assessment of geodynamics in the platform territories by the results of seismic ecological monitoring]. Geoekologiya, 2018, no. 4, pp. 40-52. (in Russian)

13. Solodilov, L.N., Popova, O.G., Konovalov, Yu.F. Vozmozhnost' monitoringa sostoyaniya zemnoi kory s ispol'zovaniem zapisei dalekikh zemletryasenii [Possibil­ity of Earth crust state monitoring using the records of far-distant earthquakes]. Razvedka i okhrana nedr, 1999, no.11, pp. 51-53 (in Russian)

14. Schneerson, M.B. Vvedenie v seismicheskuyu anizotropiyu: teoriya i praktika [Introduction to seismic anisotro­py: theory and practice]. Moscow, GERS, 2006, 160 p. (in Russian)

15. Aki, K., Christoffersson, A., Husebye, E.S. Determi­nation of the three-dimensional seismic structure of the lithosphere. J. Geophys. Res., 1977, vol. 82, no. 2, pp. 277-296.

16. Crampin, S. A review of wave motion in anisotropic and cracked elastic media. Wave motion vol. 3, 1981, pp. 343-391.

17. Crampin, S. Seismic-wave propogation through a cracked solid: polarization as a possible dilatancy diag­nostic. Geophys J.R. astr. Soc., 1978, no. 53, pp. 426-467.