Abstract
The network of infrasound stations (I34MN) in Mongolia daily registers set of infrasound from various sources besides explosions. The data from explosions in mines in region and from other sources detected since 2000 to 2009 in seismic and infrasound stations is analyzed. The analysis these signals dependence of speed distribution of sound from seasonal, wind forces and direction moreover on short distances. From detected in infrasound stations (I34MN) in year 80-90 % of signals make microbaroms, the wide range of their sources is visible from the frequency analysis. From the general analysis registered seismo and acoustic signals of explosions on the seismic and infrasound networks stations miscalculate not only speeds of distribution of sounds on close distances (50-500 km), and also the speed model of atmosphere is made.
Highlights
Infrasound observation has recently been widely applied to clarify manmade and natural producing low-frequency acoustics in the atmosphere, such as ground coupled air waves from large earthquakes
This study provides further confirmation that short-range sound propagation depends strongly on the atmospheric conditions, primarily on the variability of the meridional and zonal winds
Infrasonic waves propagate both in the stratosphere and in the thermosphere sound channels
Summary
Infrasound observation has recently been widely applied to clarify manmade and natural producing low-frequency acoustics in the atmosphere, such as ground coupled air waves from large earthquakes The Mongolian NDC (RCAG) operates seismo-acoustic (infrasound) array with which it has identified 27.22% of the total number of seismic events (~709 per year) occurring on the Mongolian mining explosions. Theoretical method Effective speed of sound: Infrasound wave propagation is, in first order, dependent on the composition and wind and temperature structure of the atmosphere. Refraction of infrasound may occur from regions where ceff becomes larger than its surface value and depends on the orientation of the wave-front This can be caused by an increase in wind, or temperature, or a combined effect. The Songino (I34MN) array has been set up to characterize infrasonic sources and to improve atmospheric and propagation models This array is a prototype CTBT1 station. A comparison of the performance of this pipe array with completely open ports demonstrated that the
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