Far-field coseismic ionospheric disturbances of Tohoku earthquake

Krasnov, V. M.; Drobzheva, Ya.V.; Chum, Jaroslav

doi:10.1016/j.jastp.2015.09.017

Cited by 17 publications

(13 citation statements)

References 16 publications

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“…Numerical simulations of the neutral atmosphere showed that acoustic waves, with a period of 15–40 s and a vertical seismic velocity of the order 1 mm/s at ground level, were sufficient to create the observed multiple‐cusp signatures (Maruyama & Shinagawa, ). Intense long‐period (>30 s) acoustic waves excited by the seismic waves were also observed on an HF Doppler system over the Czech Republic, which was 9,000 km from the epicenter of the Tohoku earthquake (Chum et al, ; Krasnov et al, ). The ratio of air particle velocity to ground surface motion considering the sound absorption was estimated to be ~10 3 at an altitude of 100 km (Chum et al, ).…”

Section: Introductionmentioning

confidence: 99%

Periodic Oscillations in the D Region Ionosphere After the 2011 Tohoku Earthquake Using LF Standard Radio Waves

et al. 2018

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We report the first observations of~100-s periodic oscillations of intensity in low-frequency (LF) standard radio waves over Japan at 05:51-05:56 UT, which was about 4 min and 42 s after mainshock onset of "the 2011 off the Pacific coast of Tohoku earthquake" on 11 March 2011 (Mw 9.0). The LF radio wave propagation paths used in this study were JJY (Japan, 60 kHz)-Rikubetsu (RKB, Japan), and BPC (China, 68.5 kHz)-RKB, where the minimum distances between the epicenter and the LF propagation paths were 413.6 and 561.5 km, respectively. The observed modulations in intensity and phase were about 0.1 dB and 0.5°, respectively. Based on a numerical simulation of the neutral atmosphere and the wave-hop method, the occurrence time of the~100-s periodic oscillations was in good agreement with the total propagation time of the Rayleigh wave that spread concentrically from the epicenter to the LF propagation paths and acoustic waves propagating vertically from the Earth's surface to the bottom of the ionosphere. Variations in synthesized electric field intensity of ground waves and sky waves, calculated by the wave hop method up to 10 hops, reproduced similar~100-s periodic oscillations that were caused by the difference in arrival time of the acoustic waves excited by the Rayleigh waves at each hop point. The amplitude of the D region electron density variations at 70 km altitude during the~100-s periodic oscillation was estimated to be about 1% compared to the background electron density, based on the numerical simulation.

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Section: Introductionmentioning

confidence: 99%

Periodic Oscillations in the D Region Ionosphere After the 2011 Tohoku Earthquake Using LF Standard Radio Waves

et al. 2018

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“…Interactions among the subsystems are greatly amplified when the triggering of massive releases of energy from either natural or anthropogenic sources occurs. The former include major geospace storms (Buonsanto, 1999; Carlowicz & Lopez, 2002; Chernogor et al., 2020; Gonzalez et al., 1994; J. Y. Liu et al., 1996; Laštovička & Chum, 2017; Lathuillère et al., 2002), large celestial bodies entering the terrestrial atmosphere (Chernogor, 2014, 2015, 2018; Chernogor & Rozumenko, 2013; Gehrels, 1994; Popova et al., 2013), high‐energy atmospheric processes (Šindelarova, Burešová, & Chum, 2009; Šindelarova, Buresova, et al., 2009; Šindelarova et al., 2015; Kelley & Dao, 2018; Nishioka et al., 2013; Raju et al., 1981; Shao & Lay, 2016), volcano eruptions (C. H. Liu et al., 1982; Roberts et al., 1982), violent earthquakes (J. Y. Liu et al., 2016; Krasnov et al., 2015; Laštovička et al., 2010; S. Pulinets & Boyarchuk, 2004; S. A. Pulinets et al., 2015), and tsunamis (Artru et al., 2005; Galvan et al., 2011, 2012; J. Y. Liu et al., 2006), etc. The anthropogenic sources include powerful chemical and nuclear explosions (Blanc & Jacobson, 1989; Blanc & Rickel, 1989; Calais et al., 1998; Chernogor & Garmash, 2018; Fitzgerald, 1997; Jacobson et al., 1988), large rocket, spacecraft, and aircraft engine burns (Chernogor & Blaunstein, 2013), chemical releases (Haerendel & Sagdeev, 1981; Häusler et al., 1986), and artificial plasma and beams of energetic charged particles injections (Haerendel & Sagdeev, 1981; Häusler et al., 1986).…”

Section: Introductionmentioning

confidence: 99%

Disturbances in the Ionosphere That Accompanied Typhoon Activity in the Vicinity of China in September 2019

et al. 2022

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We have acquired HF Doppler measurements and studied the dynamics of the ionosphere in the ∼100–300 km altitude range during the 1–10 September 2019 period of typhoon activity near the People's Republic of China (PRC). The multifrequency multiple path system located at the Harbin Engineering University campus, the PRC, and probing the ionosphere at oblique incidence was used to identify the effects from the typhoons. The response of the ionosphere to the Typhoon Lingling was detected along three adjacent radio‐wave propagation paths where chaotic and quasiperiodic variations in the Doppler shift and a significant (from −1 to 1 Hz or greater) Doppler spectrum broadening were observed to occur. The Doppler spectrum chaotic variations are due to plasma turbulence generated by typhoons in the ionosphere, and the Doppler shift quasiperiodic variations along the main ray are due to infrasound and atmospheric gravity waves (AGWs) launched by the typhoons. The relative amplitude of quasiperiodic variations in the electron density in the field of the infrasound wave reached several percent, and in the field of the AGW attained from ten to a few tens of percent. The effects of the Typhoon Faxai during 9/10 and 10/11 September 2019 nights were accompanied by a 27% decrease in the electron density in the ionospheric E and F regions. At the closest approach of the Typhoon Faxai to the ionosonde during 8/9 September 2019 night, when it had the largest energy, a 56% increase was detected in the ionospheric F region electron density.

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“…As an example, in this work we consider a case of influence of a P wave onto the ionosphere. The model of vertical motion of earth surface is developed on the basis of seismic data and in detail described in [6]. The basic oscillations of the earth surface motion under action of P wave occurred in the frequencies range of 0.0195 Hz (the period -51.2 s) and 0.039 Hz (the period 25.6 s, Fig.2).…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose it is necessary to define maximal horizontal distance from the observation point up to the surface element, from which the acoustic ray can propagate to the observation points. For example, the earth's surface with radius of 240 km forms an acoustic field at a height of 215 km during the TohokuOki earthquake [6].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, there is the model for a point source, which allows calculation of the acoustic field taking into account atmospheric inhomogeneity, nonlinear effects, absorption and divergence of the wave front because of longrange acoustic wave propagation [7]. Krasnov et al [6] have developed an algorithm, which can be used to adapt this model and the Rayleigh integral for the calculation of infrasonic fields caused by an earthquake at heights of the ionosphere.…”

Section: Introductionmentioning

confidence: 99%

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Choice of optimum heights for registration of ionospheric response onto earthquakes

et al. 2017

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To investigate the dependence of ionospheric disturbances on height we used model calculations, and the data of seismic and ionospheric observations during the Tohoku-Oki earthquake. High-altitude dependences of "portraits" of ionospheric disturbances are calculated for a case of influence of a seismic P-wave onto the ionosphere. We compared the "portraits" of ionospheric disturbances with the "portraits" of the seismic recording. The correlation coefficient of the recordings for the height of 100 km was about 0.81, for 130 km -0.85, for 160 km -0.77, for 180 km -0.76, for 200 km -0.7, for 230 km -0.54 and for 250 km -0.41. At the same time the maximum of F2-layer was at the height about 250 km. Thus, the height of a maximum of F2-layer was not optimum for registration of ionospheric disturbances due to the earthquake. It was preferable to carry out measurements of the ionospheric disturbances at the heights below 200 km. The profile of amplitude of the ionospheric disturbance had no sharply expressed maximum at the height of a maximum of F2-layer. Therefore it is problematic to use the approach of the thin layer for interpretation of TEC disturbances.

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Far-field coseismic ionospheric disturbances of Tohoku earthquake

Cited by 17 publications

References 16 publications

Periodic Oscillations in the D Region Ionosphere After the 2011 Tohoku Earthquake Using LF Standard Radio Waves

Periodic Oscillations in the D Region Ionosphere After the 2011 Tohoku Earthquake Using LF Standard Radio Waves

Disturbances in the Ionosphere That Accompanied Typhoon Activity in the Vicinity of China in September 2019

Choice of optimum heights for registration of ionospheric response onto earthquakes

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