Parameters of the Infrasonic Signal Generated by the Kamchatka Meteoroid

The paper discusses the results of the detection of seismic and infrasonic waves generated by a major earthquake and its aftershock (the moment magnitude MW=4.9 and MW=4.2 respectively), which occurred in northern Mongolia under Lake Hovsgool on December 5, 2014. The joint analysis of waveforms of seismic and infrasonic oscillations has shown that the signal recorded by the infrasound station of the Geophysical Observatory of the Institute of Solar-Terrestrial Physics SB RAS (ISTP SB RAS) is formed from sources of three generation types: local, secondary, and epicentral. This analysis enables us to propose a hypothesis of generation of epicentral infrasonic signal by flexural waves in an elastic ice membrane on the surface of Lake Hovsgool, which appear during the passage of seismic wave packets. This hypothesis explains the similarity between seismic and epicentral infrasonic signals, negative initial phase of epicentral infrasonic waves, and detection of a weak signal after a small-magnitude aftershock.

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Infrasound signals from earthquakes of December 5, 2014 in the water area of lake Hovsgol, Northern Mongolia

Доклады Академии наук ◽

10.31857/s0869-56524845610-614 ◽

2019 ◽

Vol 484 (5) ◽

pp. 610-614

Author(s):

A. G. Sorokin ◽

A. V. Klyuchevskii

Keyword(s):

Water Area ◽

Comprehensive Analysis ◽

Signal Generation ◽

Flexural Waves ◽

Geophysical Observatory ◽

Russian Academy Of Sciences ◽

Lake Hovsgol ◽

Northern Mongolia ◽

Academy Of Sciences ◽

Infrasonic Signal

A comprehensive analysis of waveforms of seismic and infrasonic vibrations from the earthquake that occurred on December 5, 2014, in the water area of Lake Hovsgol was performed. The analysis showed that the infrasonic signal recorded at the Tory station (Geophysical Observatory of the Institute of Solar-Terrestrial Physics, Russian Academy of Sciences) was formed by the sources of three generation types: local, secondary, and epicentral. The obtained results allow us to propose the model of epicentral infrasonic signal generation by flexural waves from an elastic ice membrane on the surface of Lake Hovsgol.

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Variation of infrasonic signal spectrum during wave propagation from Earth’s surface to ionospheric altitudes

Acoustical Physics ◽

10.1134/s1063771013060109 ◽

2014 ◽

Vol 60 (1) ◽

pp. 19-28 ◽

Cited By ~ 4

Author(s):

V. M. Krasnov ◽

Yu. V. Kuleshov

Keyword(s):

Wave Propagation ◽

Signal Spectrum ◽

Infrasonic Signal

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Experimental study of infrasonic signal generation during rock fracture under uniaxial compression

International Journal of Rock Mechanics and Mining Sciences ◽

10.1016/j.ijrmms.2012.12.023 ◽

2013 ◽

Vol 60 ◽

pp. 37-46 ◽

Cited By ~ 9

Author(s):

Xing Zhu ◽

Qiang Xu ◽

Jianbin Zhou ◽

Minggao Tang

Keyword(s):

Experimental Study ◽

Uniaxial Compression ◽

Rock Fracture ◽

Signal Generation ◽

Infrasonic Signal

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Infrasonic Signal Observation through the Monitoring Network

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.643.224 ◽

2014 ◽

Vol 643 ◽

pp. 224-227

Author(s):

Juan Zhao ◽

Guo Cheng Hao ◽

Zuo Xun Zeng

Keyword(s):

Gravity Wave ◽

Spectrum Analysis ◽

High Frequency ◽

Correlation Method ◽

Monitoring Network ◽

Travel Speed ◽

Calculation Error ◽

Acoustic Gravity Wave ◽

Earthquake Sources ◽

Infrasonic Signal

The methods of observing and processing infrasonic signals from earthquake sources are discussed in this paper. The categories of earthquake infrasound are firstly discussed. Spectrum analysis as well as travel speed calculation are used to distinguish high frequency local infrasound from the acoustic-gravity wave. Monitoring network has been established to capture the signals from the atmosphere. Basing on a simplified correlation method, a triangle array made of three sensors can decide the direction of the coming signal, and locate the earthquake sources. The calculation error and steps of further improvement are also discussed at the end of the paper.

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Experimental studies of vibration fields of a freight train in the far zone

Journal of Physics Conference Series ◽

10.1088/1742-6596/2131/5/052051 ◽

2021 ◽

Vol 2131 (5) ◽

pp. 052051

Author(s):

E Ya Bubnov

Keyword(s):

Solid Medium ◽

Experimental Studies ◽

Wave Structure ◽

Seismic Signal ◽

Railway Track ◽

Railway Transport ◽

Frequency Range ◽

Freight Train ◽

Spring Suspension ◽

Infrasonic Signal

Abstract The article analyzes the sources of radiation of seismic and acoustic signals of railway transport. To determine the wave structure of the seismic field of freight train in the experiment, a linear antenna was used, located at a distance of 1000 m from the railway track. A fine spectral analysis of the seismic signal reveals the presence of two harmonics in the frequency range 1–6 Hz. One of the dominant in amplitude discrete coincides in frequency with the harmonic of the acoustic signal, which indicates the refraction of the acoustic wave into a solid medium at the location of the seismic sensor. The source of the infrasonic signal at the specified frequency can be the resonant oscillation of the car on the spring suspension elasticity. The second discrete at a frequency of 2.7 Hz remains unchanged during the movement of various trains and is even present in microseismic noise, which indicates the imposition of a layered structure of a solid medium. The propagation velocity of this harmonic of the seismic signal is less than the velocity of sound. The totality of the marked features makes it possible to identify this wave with the surface wave formed by the layer.

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Infrasonic waves and assessment of energy of explosion of Beringovomorsky meteoroid on December 19, 2018

Доклады Академии наук ◽

10.31857/s0869-56524894409-413 ◽

2019 ◽

Vol 489 (4) ◽

pp. 409-413

Author(s):

E. I. Gordeev ◽

S. N. Kulichkov ◽

P. P. Firstov ◽

O. E. Popov ◽

I. P. Chunchuzov ◽

...

Keyword(s):

Bering Sea ◽

International System ◽

Kamchatka Peninsula ◽

Space Body ◽

Infrasonic Waves ◽

Infrasonic Signal ◽

The Bering Sea

On December 18, 2018 at 23:48 UTC in the Earths atmosphere, at the height of 25,6 km over the Bering sea, destruction of a meteoroid with formation of a shockwave occurred. The mass of the Beringovomorsky meteoroid is estimated as 1600 tons, and its diameter is estimated as 9-14 meters. If assessment is right, then for the last 30 years it was the second in energy explosion of a space body in the Earths atmosphere. The nearest to the epicenter of meteoroid explosion station of the international system of infrasonic monitoring (IS44 station) is located on the Kamchatka peninsula at a distance of 1024 km. At IS44 station, an infrasonic signal from destruction of a meteoroid was registered. In this paper, the results of analysis of the infrasonic signal registered by IS44 are represented and the estimation of energy of this event is carried out.

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