The Structure of the Onega Downthrown Block and Adjacent Geological Objects According to the Microseismic Sounding Method
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The geological structure of the major part of the Arkhangelsk region in the North–West Russia has been poorly studied. In the present work, the microseismic sounding method was, for the first time, used to carry out a detailed geological–geophysical survey in the region. The particles motion study confirmed the results of mathematical modeling of the smallest imaged heterogeneity and resolution of the method. The microseism stability study allowed to determine the amount of error of the microseismic sounding method which is 1–2 dB. Two geophysical cross sections of the north-eastern and south-western boundaries of the Onega downthrown block were studied. The method was shown to allow obtaining seismic images with a high precision in the horizontal direction at relatively low costs in terms of time and finances. The obtained data provided additional information about the structure of the crust, which was consistent with the known geological and geophysical information for the surveyed area. Based on the data, it was concluded that the main reasons of the dissonance of geological information were most likely the division of the downthrown block into the northern and southern blocks and horizontal displacement of the layer to the North at a depth ranging from 3 to 5 km. It was suggested that the most active tectonic processes, including eruptions of ancient volcanoes, occurred in the northern block. Two benches at the studied downthrown block were allocated at the depths of 5 and 10 km.
KeywordsMicroseism sounding amplification particles motion errors
Dr Danil Korelskiy and Danilov Mikhailare are gratefully acknowledged for the language help. The discussions with Dr A. V. Gorbatikov, Dr V. I. Francuzova, Dr A. N. Morozov, Yu. N. Afonin, and A. V Koshkin were very helpful. This work was carried out as a part of the research project of Federal Agency for Scientific Organizations, project no AAAA-A16-116052710111-2.
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