LOCAL SEISMO-ECOLOGICAL MONITORING RESULTS IN CONNECTION WITH TO THE GEOLOGICAL ENVIRONMENT ASSESSMENT

Popov M.G.^*1, Makeev V.M.^*2, Popova O.G.¹

 ¹ Lomonosov Moscow State University, Moscow, Russia
² Sergeev Institute of Environmental Geoscience the Russian Academy of Sciences, Moscow, Russia

The article presents the results of local seismoecological monitoring of the geological environment in the Caucasian Mineralnye Vody foothills and the Balakovo, Nizhegorodskaya and Kolskaya nuclear power plants (NPP) areas located on the East European platform. Using PS-waves of remote earthquakes, the geological structure and recent geodynamic conditions are studied in these locations. The areas with abnormal wave refraction are correlated for the first time with active dislocation zones. For the geological environment in the Caucasian Mineralnye Vody and Balakovo NPP areas, the three-dimensional models of depth and velocity structures were created using the kimatics of P and PS-waves from distant earthquakes. As a result, the linear high-speed and low-contrast structural heterogeneities were revealed, which are interpreted as fault zones and specific seismogenic areas. The faults correspond to transition zones from high- to low-speed boundaries of converted wave propagation. Seismogenic volumes are high speedy. Their formation is associated with the activity of upper mantle intrusions (diapirs), the rise of which causes high elastic straining in the earth’s crust layers. For the Nizhegorodskaya and Kolskaya NPPs geological environment, three-dimensional geodynamic indicators models of anisotropy g and straining state S were built for different time intervals. As a result, these indicators anomalies were detected, pronounced in a sharp rise or reduction (sometimes almost to zero) of the geoenvironment anisotropy and strain-stress state indices. The reason is the mobility (activity) of tectonic dislocation zones. In the Nizhegorodskaya NPP area, the anomalies of geodynamic parameters are related to the extension zone pronounced in dip-slip fault fissures and suffusion-karst processes. In the Kolskaya NPP area, the distant Indonesian catastrophic earthquake with M = 7.8 influenced the change in the values of geodynamic indicators. The influence was expressed in the form of induced seismic activity. This permitted us to conclude about the elevated susceptibility of geoenvironment in the Kolskaya NPP area to external strong earthquakes and remote technogenic explosions in ore mines upon the mineral deposit extraction. The research proved that the local seismo-ecological monitoring is effective for identifying, evaluating and taking into account of deep areas with variable geodynamic parameters considered as seismogenic zones. In particular, this monitoring is acute for the geoenvironmental studies in low-active platform regions upon the engineering design of highly responsible, technologically complex and unique facilities (nuclear power plants, nuclear particle accelerators, radioactive waste disposal facilities, etc.), due to the induced seismicity problems.   

Key words: converted waves, three-dimensional models, geodynamic parameters, anisotropy, straining, deep faults, active zones, seismicity, geological environment, monitoring, nuclear power plants 

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