Coseismic infrasound in the ionosphere by continuous Doppler sounding

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Coseismic infrasound in the ionosphere by continuous Doppler sounding

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Coseismic infrasound in the ionosphere by continuous Doppler sounding

Popis výsledku anglicky

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.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

<a href="/cs/project/GC15-07281J" target="_blank" >GC15-07281J: Jevy spojující neutrální a ionizovanou atmosféru</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů