METADATA IN ENGLISH

About the journal

SEISMICHESKIE PRIBORY, ISSN: 0131-6230, eISSN: 2312-6965, DOI: 10.21455/si,

http://elibrary.ru/title_about.asp?id=25597

English Translation: Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online),

https://link.springer.com/journal/11990

Application of robust phase algorithms

for seismic emission recognition in region

of mine explosions

A.V. Varypaev1, I.A. Sanina1, A.B. Chulkov1, A.F. Kushnir2

1 Institute of Geosphere Dynamics RAS, Moscow, Russia

2 Institute of Earthquake Prediction Theory and Mathematical Geophysics, RAS, Moscow, Russia

Corresponding author: A.V. Varypaev, e-mail: avalex89@gmail.com

Abstract. Multichannel signal processing algorithms have been developed, which allow detecting signals of weak seismic events observed against the background of natural seismic noise. The algorithms of weak seismic signal detection are based on the estimation of coherence measure of P-waves, recorded by a small aperture array. The advantage of these algorithms over the known single-channel STA/LTA detector is the ability to detect time intervals of P-waves with a signal-to-noise ratio (SNR) less than one. Using the robust to noise phase bimforming algorithm [Zhang et al., 2008; Kushnir, Varypaev, 2017], an apparent slow-motion vector can be then estimated by the revealed time intervals of the seismic records, where the values of the coherence measure exceed a certain threshold. The developed multichannel signal processing algorithms were tested with the real seismic records by a small aperture array, deployed in the area of the Kursk Magnetic Anomaly, directly near the mining facilities for extraction of iron ore. Within 20 hours of seismic records, signals were revealed of both strong (underground mine explosions) and weak seismic events. In some cases it was possible to show that seismic events have a complex focal mechanism. On the basis of the optimal Capon filter [Capon, 1969] we have discovered the similarity (up to sign) of P-waves generated by the different weak events, the duration of which does not exceed 0.2 s and the shape is similar to the known function of the Ricker pulse [Bording, 1996].

Keywords: weak seismic event, small aperture array, signal detection, Capon filter, microseismicity monitoring.

About the authors

VARYPAEV Alexander Vyacheslavovich – Senior Researcher Institute of Geopheres Dynamics of the Russian Academy of Sciences. 119334, Moscow, Leninsky Prospect, 38, building 1. Phone: +7(495) 939-75-82. E-mail: avalex89@gmail.com

CHULKOV Alexey Borisovich – Lead engineer, Institute of Geopheres Dynamics of the Russian Academy of Sciences. 119334, Moscow, Leninsky Prospect, 38, building 1. Phone: +7(495) 939-75-82. E-mail: alxchl@yandex.ru

SANINA Irina Alfatovna – Head of the laboratory Institute of Geopheres Dynamics of the Russian Academy of Sciences. 119334, Moscow, Leninsky Prospect, 38, building 1. Phone: +7(495) 939-75-82. E-mail: irina@idg.chph.ras.ru

KUSHNIR Alexander Fedorovich – Leading Researcher, Institute of Theory of Earthquake Prediction and Mathematical Geophysics of the Russian Academy of Sciences. 117997, Moscow, Profsoyuznaya street, 84/32. Phone: +7(495) 333-34-01. E-mail: afkushnir@gmail.com

Cite this article as: Varypaev A.V., Sanina I.А., Chulkov A. B., Kushnir A.F. Application of robust phase algorithms for seismic emission recognition in region of mine explosions. Seismicheskie Pribory, 2018, Vol. 54, no 2, pp. 33-48. (in Russ.). DOI: 10.21455/si2018.2-3

English translation of the article will be published in Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online), https://link.springer.com/journal/11990), 2019, Volume 55, Issue 2.