Analysis of seismoionospheric disturbances at the Chain of Japanese stations for vertical sounding of the ionosphere

Korsunova, L. P.; Khegai, V. V.

doi:10.1134/s0016793208030134

Cited by 22 publications

(18 citation statements)

References 4 publications

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“…The epicentres are located at a distance 90-500 km from Athens. However, it was found that there is a limitation in distance after which we could not find any reliable ionospheric anomalies (Korsunova and Khegai, 2008;Perrone et al, 2010). In our case, we did not analyse the more distant EQs from the Athens ionosonde station, i.e.…”

Section: Discussionmentioning

confidence: 99%

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Ionospheric anomalies detected by ionosonde and possibly related to crustal earthquakes in Greece

et al. 2018

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Abstract. Ionosonde data and crustal earthquakes with magnitude M ≥ 6.0 observed in Greece during the 2003-2015 period were examined to check if the relationships obtained earlier between precursory ionospheric anomalies and earthquakes in Japan and central Italy are also valid for Greek earthquakes. The ionospheric anomalies are identified on the observed variations of the sporadic E-layer parameters (h Es, foEs) and foF2 at the ionospheric station of Athens. The corresponding empirical relationships between the seismoionospheric disturbances and the earthquake magnitude and the epicentral distance are obtained and found to be similar to those previously published for other case studies.The large lead times found for the ionospheric anomalies occurrence may confirm a rather long earthquake preparation period. The possibility of using the relationships obtained for earthquake prediction is finally discussed.

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Section: Discussionmentioning

confidence: 99%

“…According to Korsunova and Khegai (2008) and Perrone et al (2010), the deviations in h Es, fbEs and foF2 ionospheric parameters should simultaneously satisfy the ionospheric anomaly selection criteria.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric anomalies detected by ionosonde and possibly related to crustal earthquakes in Greece

et al. 2018

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“…According to Korsunova and Khegai (2008) the deviations in three h Es, fbEs, and foF2 ionospheric parameters should simultaneously satisfy the precursor selection criteria. The occurrence of abnormally high Es layer for 2-3 h is considered as a necessary condition for identification.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric precursors for crustal earthquakes in Italy

2010

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Abstract.Crustal earthquakes with magnitude 6.0>M≥5.5 observed in Italy for the period 1979-2009 including the last one at L'Aquila on 6 April 2009 were considered to check if the earlier obtained relationships for ionospheric precursors for strong Japanese earthquakes are valid for the Italian moderate earthquakes. The ionospheric precursors are based on the observed variations of the sporadic E-layer parameters (h Es, fbEs) and foF2 at the ionospheric station Rome. Empirical dependencies for the seismo-ionospheric disturbances relating the earthquake magnitude and the epicenter distance are obtained and they have been shown to be similar to those obtained earlier for Japanese earthquakes. The dependences indicate the process of spreading the disturbance from the epicenter towards periphery during the earthquake preparation process. Large lead times for the precursor occurrence (up to 34 days for M=5.8-5.9) tells about a prolong preparation period. A possibility of using the obtained relationships for the earthquakes prediction is discussed.

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“…Any attempt to derive quantitative relationships for the seismo-ionospheric coupling should be considered an important step towards better understanding of the physical mechanisms driving such phenomena. An approach showing remarkable results was proposed by Korsunova and Khegai [41,42] and successively applied by Perrone et al [43,44], according to which a dense Es layer can be produced over the preparation zone of future EQs at 120-140 km height. The preparation zone is defined by the Dobrovolsky formula [45], ρ ≤ 10 0.43M , where M is the magnitude of the EQ and ρ is the radius (in km) of the supposed circular preparation zone, centered in the epicentral location.…”

Section: Introductionmentioning

confidence: 99%

“…The preparation zone is defined by the Dobrovolsky formula [45], ρ ≤ 10 0.43M , where M is the magnitude of the EQ and ρ is the radius (in km) of the supposed circular preparation zone, centered in the epicentral location. A multi-parametric approach considering quasi-simultaneous variations in three parameters of the Es and regular F2 layers is applied [42][43][44]46]. This approach relates the lead time ∆T for a future EQ event, counted from the moment of the observed ionospheric anomaly occurrence, with the magnitude of the EQ and the distance of its epicenter.…”

Section: Introductionmentioning

confidence: 99%

Ionosonde Data Analysis in Relation to the 2016 Central Italian Earthquakes

et al. 2020

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Ionospheric characteristics and crustal earthquakes that occurred in 2016 next to the town of Amatrice, Italy are studied together with the previous events that took place from 1984 to 2009 in Central Italy. The earthquakes with M larger than 5.5 and epicentral distances from the ionosonde less than 150 km were selected for the analysis. A multiparametric approach was applied using variations of sporadic E-layer parameters (the height and the transparency frequency) together with variations of the F2 layer critical frequency foF2 at the Rome ionospheric observatory. Only ionospheric data under quiet geomagnetic conditions were considered. The inclusion of new 2016 events has allowed us to clarify the earlier-obtained seismo-ionospheric empirical relationships linking the distance in space (km) and time (days) between the ionospheric anomaly and the impending earthquake, with its magnitude. The improved dependencies were shown to be similar to those obtained in previous studies in different parts of the world. The possibility of using the obtained relationships for earthquake predictions is discussed.

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Analysis of seismoionospheric disturbances at the Chain of Japanese stations for vertical sounding of the ionosphere

Cited by 22 publications

References 4 publications

Ionospheric anomalies detected by ionosonde and possibly related to crustal earthquakes in Greece

Ionospheric anomalies detected by ionosonde and possibly related to crustal earthquakes in Greece

Ionospheric precursors for crustal earthquakes in Italy

Ionosonde Data Analysis in Relation to the 2016 Central Italian Earthquakes

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