HYPOTHESIS OF STRONG SEISMIC EVENT ORIGIN IN RASVUMCHORR MINE ON JANUARY 9, 2018

In spotlight is a strong magnitude 3.3 seismic event which took place on Jan 9 2018 in Rasvumchorr Mine, Apatite Circus deposit, with big noise, underground and surface shaking, appreciable damage of mine workings, and was felt both by mine personnel and residents of Kirovsk and Apatity towns. The damaged zone in adjacent rock mass is revealed within the elevation range of 100 m. The volume of damaged rocks reaches 135000 m3. Such rank events are observed in the Khibiny rockburst-hazardous rock mass at a period of 5–10 and more years, are hard to predict and very hazardous. They induce heavy damage in mines and on ground surface, violate production process and, what is specifically critical, threaten the health of miners. The difficulties of predicting and classifying such events are described. A new definition of an induced earthquake is proposed for the classification of seismic events in mines. The actual survey results obtained in underground excavations immediately after the seismic event of Jan 9, 2018 are presented, and the automated seismic audit data in Rasvumchorr Mine are analyzed. The geological, geomechanical and geotechnical factors that have influence on geodynamic behavior in the rock mass area under analysis are discussed, and the hypothesis of the origin of the event and its classification are proposed.


The studies were performed in the framework of the research topics of the 0226-2016-0004_GoI «Study of the processes of energy exchange in the geological environment of mining systems for providing geodynamic safety of the mining development of the North-West Arctic region».

Keywords

Rockburst-hazardous deposit, induced earthquake, tectonic rockburst, stress–strain state, underground mineral mining, geodynamically active structures.

Issue number: 12
Year: 2018
ISBN:
UDK: 551.2/.3+622.83
DOI: 10.25018/0236-1493-2018-12-0-74-83
Authors: Kozyrev A. А., Semenova I. E., Zhuravleva O. G., Panteleev A.V.

About authors: Kozyrev A.А., Doctor of Technical Sciences, Professor, Deputy Director for Scientific Work, e-mail: kozar@goi.kolasc.net.ru, Semenova I.E., Candidate of Technical Sciences, Leading Researcher, e-mail: innas@goi.kolasc.net.ru, Zhuravleva O.G., Candidate of Technical Sciences, Senior Researcher, e-mail: ZhuravlevaOG@goi.kolasc.net.ru, Panteleev A.V., Leading Engineer, e-mail: PanteleevAV@goi.kolasc.net.ru, Mining Institute — Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences» (Mining Institute KSC RAS), 184209, Apatity, Russia.

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