Seismo-Acoustic data analysis at I34MN Mongolia - Songino Seismo-Acoustic data analysis at I34MN Mongolia - Songino RESEARCH CENTRE OF ASTRONOMY AND GEOPHYSICS.

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Seismo-Acoustic data analysis at I34MN Mongolia - Songino Seismo-Acoustic data analysis at I34MN Mongolia - Songino RESEARCH CENTRE OF ASTRONOMY AND GEOPHYSICS OF MONGOLIAN ACADEMY OF SCIENCES Ch. Bayarsaikhan, M. Ulziibat, A. Le Pichon, A. Schlupp

TOPICS DESCRIPTION OF MINE EXPLOSIONS AROUND I34MN SEISMO-ACOUSTIC DATA ANALYSIS STATISTICS AND VARIABILITY OF THE PROPAGATION PARAMETERS OF MINE EXPLOSIONS EVALUATION OF THE CELERITY SEASONAL VARIATION OF INFRASONIC DETECTION CONCLUSION

Four infrasound sensors arranged as a triangular array of 3 km aperture. I34MN INFRASOUND STATION IN SONGINO

Wind noise Hz Signals WIND-NOISE REDUCING SYSTEM Gravel filters for wind noise reducing

Seismic stations are equipped with 9 vertical component short-period seismometers and one tree component short and long period seismic sensors. The 10 seismic stations which form double circled array with radius 1-3 km. SEISMIC NETWORK

Several large mines in the region routinely generate explosions that are detected seismically and with infrasound sensors. Mines are located km from the seismic and infrasound array. Baganuur coal mine, 180 km east of the array, regularly produces 5-10 seismic detections per week. Erdenet copper mine, which located 300 km north-west produces several explosions every week between UTM time. Shariin gol Mine km north-east. Borundur km south-east. Bagahangai 97.8 km east-south. …

IDENTIFYING AND LOCALIZATION OF QUARRY BLAST USING SEISMIC DATA Real time processing and interpretation of seismic data from 15 seismic stations For identifying quarry blast we use waveforms, first motion, magnitude ratio of Ms and Ml. JADE and ONYX software are used for determining location and origin time of quarry blast. Results are stored in Oracle database.

~10 min I arrivals JADE

ONYX

Others Baganuur Shariingol Erdenet SEISMIC LOCATIONS Quarries identification

Infra and seismic continuous real time data observation in JADE Automatic processing of Infrasonic data done by PMCC ( Hz) Detailed processing of data is done manually using WinPmcc ~12 min INFRASONIC DATA PROCESSING JADEWinPmcc + I arrivals

WinPmcc analysis: different arrivals generated by one explosion

V ARIABILITY OF THE PROPAGATION PARAMETERS ERDENET MINE Average number of detection on from April to September no detection Average azimuth on Average trace velocity on Azimuth: °Celerity: 0.30 – 0.34 km/sTrace velocity: 0.35 km/s

V ARIABILITY OF THE PROPAGATION PARAMETERS BAGANUUR MINE Average number of detection on from March to July no detection Average azimuth on Average trace velocity on Azimuth: °Celerity: km/sTrace velocity: km/s

CELERITY ESTIMATION The distance to Baganuur coal mine is 150 km and travel time of infrasonic wave is sec The distance to Erdenet copper mine is 300 km and travel time of infrasonic wave is sec The distance to Shariingol coal mine is 180 km and travel time of infrasonic wave is sec The distances to other coal mines are in 300 km range and travel time of infrasonic wave is sec Celerity calculated using all explosion data C = km/s

PHASE IDENTIFICATION

SEASONAL VARIATION OF INFRASONIC DETECTION For the Erdenet copper mine explosions, we have clear seasonal variation. Erdenet mine is making every week one series of explosions. Seasonal variation of the detections are observed. Baganuur mine explosions are made not on fixed time in July and August we got 4 detections. Blue is detections of Infrasound Red is seismic detections From November to February, ~50% of the explosions generate also infrasonic arrivals.

STATISTICS ON ALL DETECTIONS AUTOMATICALLY DETECTED BY PMCC Azimuth distribution of infrasonic detection on Statistics on the number of detections from the automatic bulletin Hz The source of detection is mainly from mine explosions, military activity, city noises and also some time from large teleseismic events IIIIII IV VVI VIIVIIIIX X XI XII

CONCLUSION  Because of surrounding mines, explosions are detected by both Infrasound and Seismic stations. The seismo-acoustic synergy enables a fine analysis of the source.  The detections of Infrasound station clearly depend on the season: propagation effects and wind-noise variability.  Future work: automatic association of I and S arrivals for quarries location.