interpretation of deformed ionograms induced by vertical ground motion of seismic rayleigh waves and infrasound in the thermosphere
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ID: 192204
2016
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Abstract
The vertical ground motion of seismic surface waves launches acoustic waves
into the atmosphere and induces ionospheric disturbances. Disturbances due to
Rayleigh waves near the short-period Airy phase appear as wavy fluctuations
in the virtual height of an ionogram and have a multiple-cusp signature (MCS)
when the fluctuation amplitude is increased. An extremely developed MCS was
observed at Kazan, Russia, after the 2010 M 8.8 Chile earthquake. The ionogram
exhibited steep satellite traces for which the virtual heights increased
rapidly with frequency starting near the top of cusps and continuing for
0.1–0.2 MHz. This complicated ionogram was analyzed by applying a ray
tracing technique to the radio wave propagation in the ionosphere that was
perturbed by acoustic waves. Acoustic wavefronts were inclined by the effects
of finite Rayleigh wave velocity and sound speed in the thermosphere. The
satellite echo traces were reproduced by oblique returns from the inclined
wavefronts, in addition to the nearly vertical returns that are responsible
for the main trace.
| Reference Key |
maruyama2016annalesinterpretation
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|---|---|
| Authors | ;T. Maruyama;T. Maruyama;K. Yusupov;A. Akchurin |
| Journal | journal of food measurement and characterization |
| Year | 2016 |
| DOI |
10.5194/angeo-34-271-2016
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| URL | |
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