5:15 PM - 6:30 PM
[MTT43-P01] Infrasound detection of mining blasts from eastwards and westwards
Keywords:Infrasound, Mining blast, CTBT
There are several large mines in Southwestern Siberia, Russia, blasting using explosives is carried out for the topsoiling and mining of minerals. When blasting, shock waves are generated according to the power of the explosive, including expansion of high-temperature and high-pressure gases. Even if the explosives are installed in the ground, when crushed materials and pressure waves erupt into the atmosphere with the explosion, they can be observed as infrasound. In the case of known mines, the distance to the station is known, so it is possible to estimate the propagation time depending on weather conditions. Furthermore, when seismic waves propagated through the ground are observed at several seismic stations, the seismic origin position and origin time are determined, and it is also possible to determine the location of the sound source based on the azimuth analyzed from the infrasound data and the observation time.
CTBT Infrasound station of I46RU is consisted of 4 sites installed infrasound sensor (MB2000), is also deployed at Zalesovo, Russia. Within 1,000 km of the I46RU, there are several mines in operation, and infrasound by blasting can be observed from eastward, and westward during the same time. As a feature of the signals, they have a dominant frequency between 1 Hz and 4 Hz, the duration is about 10 seconds. Since the time of mining is concentrated in the day, trace velocity of many signals are analyzed that propagate roughly straight near the ground surface due to the effect of forming a reverse fault between several height and the ground surface, after that, signals of the trace velocity which seems to have been propagated by guiding between the tropopause, or the stratopause and the ground surface can be observed.
In the poster, we would like to consider the characteristics of signals when propagated from eastward and/or westward sound sources based on the differences in seasonal atmospheric conditions.
CTBT Infrasound station of I46RU is consisted of 4 sites installed infrasound sensor (MB2000), is also deployed at Zalesovo, Russia. Within 1,000 km of the I46RU, there are several mines in operation, and infrasound by blasting can be observed from eastward, and westward during the same time. As a feature of the signals, they have a dominant frequency between 1 Hz and 4 Hz, the duration is about 10 seconds. Since the time of mining is concentrated in the day, trace velocity of many signals are analyzed that propagate roughly straight near the ground surface due to the effect of forming a reverse fault between several height and the ground surface, after that, signals of the trace velocity which seems to have been propagated by guiding between the tropopause, or the stratopause and the ground surface can be observed.
In the poster, we would like to consider the characteristics of signals when propagated from eastward and/or westward sound sources based on the differences in seasonal atmospheric conditions.