Over-the-Horizon Anomalous VHF Propagation and Earthquake Precursors

Devi, M.; Barbara, A. K.; Ruzhin, Y.; Hayakawa, Masashi

doi:10.1007/s10712-012-9185-z

Cited by 22 publications

(15 citation statements)

References 37 publications

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“…Now, to understand why an earthquake precursory signature on radio refractive index should exceed the critical limit of −157 km −1 one needs to understand the role of Earth's surface in the heat exchange processes. As mentioned in Devi et al [20] the Earth's surface act as a catalyst of energy exchange processes with the near-Earth environment, the troposphere. In order to understand the heat exchange processes, the changes in specific latent heat flux (SLHF) were evaluated prior to the Earthquake [21].…”

Section: Resultsmentioning

confidence: 99%

Modification in Atmospheric Refractivity and GPS Based TEC as Earthquake Precursors

Karia¹,

Pathak²,

Yadav³

et al. 2014

POS

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The present paper reports the modification in GPS TEC (total electron content) and atmospheric refractivity prior to the Iran earthquake that had occurred on 16 April 2013 in Iran (28.10˚N, 62.05˚E). The analysis of GPS-based TEC from two GPS receivers, Surat (21.16˚N, 72.78˚E) and Lucknow (26.91˚N, 80.95˚E) and results of atmospheric refractivity profile for radiosonde observation stations (Shiraz, Iran and Delhi, India) around the fault line are presented in this paper. It is seen that atmospheric refractivity gets modified from 8 to 6 days prior to the earthquake at Shiraz, Iran and Delhi, India. The GPS TEC showed variations a few days prior to the earthquake. We conclude that in search of precursory signatures for an earthquake, both GPS TEC and refractivity are important parameters.

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Section: Resultsmentioning

confidence: 99%

Modification in Atmospheric Refractivity and GPS Based TEC as Earthquake Precursors

Karia¹,

Pathak²,

Yadav³

et al. 2014

POS

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“…Authors of [88] confirmed that the anomalous propagation events were the result of scattering of VHF-band radio waves in the troposphere immediately prior to an EQ, by documenting reception at an observatory that was beyond the line of sight of transmission location. Authors of [5] [90] have additionally observed the anomalous VHF-band radio-wave propagation beyond the line of sight prior to EQs. Open Journal of Earthquake Research Authors of [91] have proposed a generation mechanism of atmospheric disturbances resulting from changes in geochemical quantities associated with EQs and VHF radio wave refraction.…”

Section: Electromagnetic Phenomenamentioning

confidence: 99%

“…The perturbation of air temperature and density in the atmosphere could follow the pre-seismic hot water and gas releases resulting in the generation of AGWs with the periods in a range of 6 -60 min. Seismo-induced AGWs could lead to the ionosphere turbulence [4] and the over-the-horizon VHF radio wave propagation in the atmosphere [5]. Among the possible AGW effects are the perturbations of VLF/LF waves in the lower ionosphere [6] and the depression of ULF emissions of magnetosphere origin observed on the ground [7].…”

Section: Introductionmentioning

confidence: 99%

A Review on Electrodynamic Influence of Atmospheric Processes to the Ionosphere

Сорокин¹,

Chmyrev²,

Hayakawa³

2020

OJER

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This work is an attempt to critically analyze the existing theoretical models of the impact of earthquake preparation processes on the state of the earth's atmosphere and ionosphere in the zone of growing seismic activity, as well as the mechanisms of formation and transfer of disturbances in various media over the earthquake center. The determining factor (criterion) of the analysis is the degree of compliance of the simulation results with experimental data obtained at various phases of earthquake development by direct and remote diagnostic methods using ground and aerospace technologies. The key role is played by the model's compliance with the results of measuring electric fields and currents in the near-ground atmosphere and ionosphere, small-scale ionospheric inhomogeneities and correlated field-aligned currents and electromagnetic ULF/ELF emissions. A full-fledged model should also explain the origin of such seismic related phenomena as the generation in the troposphere and over-horizon propagation of pulsed VHF radiation, thermal effects and associated IR emissions as well as the modification of plasma distribution in the D, E and F layers of the ionosphere. The use of this criterion in the analysis allowed us to identify a theoretical model that most fully describes the totality of the above-mentioned experimental data within a single physical mechanism. This is an electrodynamic model based on the perturbation of the conductivity current in the global atmosphere-ionosphere electric circuit due to the injection of charged aerosols into the atmosphere during the preparation and development of an earthquake. The present paper describes this model and the formation mechanisms of related phenomena in the atmosphere and ionosphere, which can be considered as short-term precursors to earthquakes.How to cite this paper: Sorokin, V.M., Chmyrev, V.M. and Hayakawa, M. (2020) A Review on Electrodynamic Influence of Atmospheric Processes to the Ionosphere.

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“…The coordinated measurement is already described in the previous future aspect from a practical science, which include ionospheric (VLF, ionosonde etc. ), atmospheric perturbation (ULF/ELF (extremely low frequency) radiation , over-the-horizon VHF wave reception (Devi et al, 2012)), lithospheric radiation (ULF emissions etc. ), satellite observation (plasma, waves, Earth's surface temperature etc.).…”

Section: Future Of Eq Predictionmentioning

confidence: 99%

Earthquake prediction with electromagnetic phenomena

Hayakawa

2016

AIP Conference Proceedings

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Over-the-Horizon Anomalous VHF Propagation and Earthquake Precursors

Cited by 22 publications

References 37 publications

Modification in Atmospheric Refractivity and GPS Based TEC as Earthquake Precursors

Modification in Atmospheric Refractivity and GPS Based TEC as Earthquake Precursors

A Review on Electrodynamic Influence of Atmospheric Processes to the Ionosphere

Earthquake prediction with electromagnetic phenomena

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