Coseismic infrasound in the ionosphere by continuous Doppler sounding

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F17%3A00477741" target="_blank" >RIV/68378289:_____/17:00477741 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Coseismic infrasound in the ionosphere by continuous Doppler sounding
Original language description
Examples and analysis of coseismic infrasound waves observed in the ionosphere by an international network of continuous Doppler sounders are presented. It is documented that the co-seismic infrasound is generated by vertical movement of the ground surface caused by seismic waves propagating at supersonic speeds from strong, M>7, earthquakes. The coseismic infrasound propagates nearly vertically and has usually periods of several tens of seconds far away from the epicenter. However, in the vicinity of the epicenter (up to distance about 1000-1500 km), the large amplitudes might lead to nonlinear formation of N-shaped pulse in the upper atmosphere with much longer dominant period, e.g. around 2 min. The experimental observation by continuous Doppler sounding at horizontal distance about 800 km from the epicenter of M 8.3 earthquake and at height around 200 km is in good agreement with full wave numerical modeling that uses as boundary condition the measured vertical velocity of the ground surface. It is also shown that the spectral content can be nonlinearly changed at intermediate distances (around 3000-4000 km), though the Nshaped pulse is not obvious.
Czech name
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Czech description
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Project
<a href="/en/project/GC15-07281J" target="_blank" >GC15-07281J: Phenomena coupling the neutral and ionized atmosphere</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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