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The records analysis of the Chebarkulsky meteorite at infrasoundarrays of nuclear monitoring

Authors: Дубровин Виталий Игоревич, Смирнов Александр Александрович

Keywords: метеорит, взрыв

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On February 15, 2013 the network of seismic and infrasound arrays of Kazakhstan recorded signals from fireball explosion around Chelyabinsk. Using infrasound station records the signals from fireball explosion were detected and investigated, apparent velocity, frequency bands, azimuths of signal arrival were determined. Using seismic stations data the time and place of acoustic wave ground impact and magnitude of seismic event were determined. This event is the second by its force after falling of Tungus meteorite in 1908.

Historical seismic records of explosions, carried out to create the mud dam in Medeo

Authors: Соколова Инна Николаевна

Keywords: взрыв, сейсмограмма

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The author studied characteristics of explosions in Medeo (October 21, 1966, April 14, 1967 and November 20, 1973) implemented for construction of the dam, information on macro-seismic occurrences of these explosions in Almaty city as well as seismic effect in comparison with strong industrial and research explosions during the construction of dams in Central Asia. A travel-time curve of main regional phases for close and regional distances was described; it was constructed on the basis of historical archived seismograms as well as a composite travel-time curve for the region of Northern Tien Shan near Almaty. There was a comparison drawn with the travel-time curve, constructed on records of a strong Kambarata explosion on December 22, 2009, in Kyrgyzstan. The obtained results may be used to improve localization of seismic events and modeling of early warning system in Almaty.

Estimation of the power class of technogenic seismic events in the conditions of the Voronezh crystalline massif

Authors: Дубянский А.И., Ефременко М.А., Пивоваров С.П., Дубянский А.И.

Keywords: взрыв, техногенное воздействие, Воронеж, кристаллический массив

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The analysis results of power class value distributions of technogenic seismic events in the territory of the Voronezh crystalline massif are given in work. It is established that for the same events the value of a power class varies depending on distance and can differ in hundreds of times. The major influencing factor is generally amplitudes of transverse waves.

Characterizing and modelling ocean ambient noise using infrasound network and middle atmospheric models

Authors: Де Карло М., Ле Пишон А., Де Карло М., Ардуин А., Нэшолм С.П.

Keywords: взрыв, атмосфера, инфразвуковая сеть

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Infrasound is one of the technologies of the International Monitoring System (IMS) supporting the verification regime of the Comprehensive Nuclear-Test-Ban Treaty (CTBT). In the frequency band of interest to detect atmospheric explosions, ambient noise may affect detection and particularly ocean noise referred to as microbaroms. Ocean wave interactions generate acoustic noise almost continuously which can obscure signals of interest in their frequency range. The detectability of such noise strongly depends on atmospheric conditions along the propagation paths. Using ocean wave action model developed by IFREMER and considering the effects of general middle-atmospheric products delivered by ECMWF in long-range propagation, microbarom amplitudes and direction of arrivals derived from various propagation models are compared with the observations. With this study, it is expected to enhance the characterization of the ocean-atmosphere coupling. In return, a better knowledge of microbarom sources would allow to better characterize explosive atmospheric events hidden in the ambient noise.