Ionospheric signatures of the April 25, 2015 Nepal earthquake and the relative role of compression and advection for Doppler sounding of infrasound in the ionosphere

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F16%3A00456744" target="_blank" >RIV/68378289:_____/16:00456744 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1186/s40623-016-0401-9" target="_blank" >http://dx.doi.org/10.1186/s40623-016-0401-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1186/s40623-016-0401-9" target="_blank" >10.1186/s40623-016-0401-9</a>

Result language

angličtina

Original language name

Ionospheric signatures of the April 25, 2015 Nepal earthquake and the relative role of compression and advection for Doppler sounding of infrasound in the ionosphere

Original language description

Ionospheric signatures possibly induced by the Nepal earthquake are investigated far outside the epicentral region in Taiwan (3700 km distance from the epicenter) and in the Czech Republic ( 6300 km distance from the epicenter). It is shown that the ionospheric disturbances were caused by long period, 20 s, infrasound waves that were excited locally by vertical component of the ground surface motion and propagated nearly vertically to the ionosphere. The infrasound waves are heavily damped at the heights of F layer at around 200 km, so their amplitude strongly depends on the altitude of observation. In addition, in the case of continuous Doppler sounding, the value of the Doppler shift depends not only on the advection (up and down motion) of the reflecting layer but also on the compression/rarefaction of the electron gas and hence on the electron density gradient. Consequently, under significant differences of reflection height of sounding radio waves and partly also under large differences in plasma density gradients, the observed ionospheric response at larger distances from the epicenter can be comparable with the ionospheric response observed at shorter distances, although the amplitudes of causative seismic motions differ by more than one order of magnitude.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BL - Plasma physics and discharge through gases

OECD FORD branch

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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

2016

Confidentiality

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

Name of the periodical

Earth, Planets and Space

ISSN

1880-5981

e-ISSN

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Volume of the periodical

68

Issue of the periodical within the volume

1

Country of publishing house

DE - GERMANY

Number of pages

12

Pages from-to

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UT code for WoS article

000370471100003

EID of the result in the Scopus database

2-s2.0-84959290180