Definition of the Seismic Field of the Underground Sources in the Ambient Seismic Noise in the Tien Shan Region Using a
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ISSN 1674-487X
Definition of the Seismic Field of the Underground Sources in the Ambient Seismic Noise in the Tien Shan Region Using a Three-Component Gradient System Anatoly Kuzmich Rybin 1, Elena Anatol’evna Bataleva1, Kseniia Sergeevna Nepeina *1, Pavel Alexandrovich Kaznacheev2, Pavel Alexandrovich Matiukov1, Pavel Nikolaevich Aleksandrov3 1. Research Station of the Russian Academy of Sciences, Bishkek 720049, Kyrgyz Republic 2. The Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Moscow 123242, Russia 3. Geoelectromagnetic Research Center of the Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Troitsk 108840, Russia Anatoly Kuzmich Rybin: https://orcid.org/0000-0001-7810-3278; Kseniia Sergeevna Nepeina: https://orcid.org/0000-0003-0725-8023 ABSTRACT: This paper considers a new approach to solving the problem of quantitative estimation of the microseism energy for underground sources that is based on the synthesis of noise interferometry and the passive seismic method of the gradient system. The selection of a seismic field of the underground sources is considered in an experiment conducted in the Tien Shan region. The peculiarities of approach include the separation of vertical microseisms in the ambient seismic noise field structure according to the data of the seismic gradient system and a passive noise interferometry diagram, where microseisms from the underground sources are used as the seismic signal source. It is shown that the use of noise interferometry and passive seismic gradient system allows using the synchronous microseism recordings in a small number of points for passive medium sensing, and leads to the restoration of unknown energy parameters of the seismic field of underground sources. KEY WORDS: gradient system, passive seismic, Tien Shan, geodynamics. 0
INTRODUCTION Ambient seismic noise could be effective in monitoring present-day geodynamic processes in the areas with the known geologic features. We suggest the new approach of the microseism energy estimation for underground sources with the passive seismic method of gradient system. This signal processing method is also related to the seismic gradiometer array by Langston (2007) to study the site effects on the plane or 2D seismic wavefield reconstruction as Maeda et al. (2016). Such studies have not been performed in the territory of Russia and the former USSR. In Kyrgyzstan, we have applied such a method and its practical implementation for the first time, but with seismic sounding. It is shown, that the combination of methods allows using the synchronous noise recordings, eliminates the influence of horizontal seisms on the signal, and we could numerically separate the vertical component of the wave field in the ambient seismic noise. In this experiment, we study the microseisms registered on the ground surface by the passive seismic method. Due to the high seismic and geodynamic activity, the inland Tien Shan *Corresponding author: [email protected] © China University of Geosci
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