Formation mechanism of great positive TEC disturbances prior to Wenchuan earthquake on May 12, 2008

Клименко, М. В.; Клименко, В. В.; Zakharenkova, Irina; Пулинец, С. А.; Zhao, Biqiang; Tsidilina, M. N.

doi:10.1016/j.asr.2011.03.040

Cited by 92 publications

(45 citation statements)

References 44 publications

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“…For example, Zolotov et al (2008) Zolotov et al (2008) have shown that the observable TEC perturbation is due to an additional electric field with an amplitude of 6 mV/m. It is further suggested by Klimenko et al (2011Klimenko et al ( , 2012 and Namgaladze et al (2009) that a possible general cause of TEC perturbation is a vertical plasma drift by the zonal electric field. Computer simulations by Klimenko et al (2012) have shown that the amplitude of electric field disturbance is required to be 3-9 mV/m.…”

Section: Basic Properties Of DC Electric Fieldsmentioning

confidence: 99%

Generation of Seismic-Related DC Electric Fields and Lithosphere-Atmosphere-Ionosphere Coupling

Сорокин¹,

Hayakawa²

2013

MAS

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This paper reviews modeling of the influence of earthquake (EQ) preparation processes on the ionosphere through the electric field and electric current occurring in the global atmosphere-ionosphere electric circuit. Our consideration is based on the satellite-and ground-based experimental data of electric fields, plasma and electromagnetic perturbations obtained for several days before an EQ. We have ruled out the models which are not consistent with the experimental data on the electric fields in the ionosphere and also on the ground surface. There has then been proposed a new model of the generation of electric field on the basis of injection of charged aerosols into the atmosphere, and we discuss the mechanism of lithosphere-atmosphere-ionosphere coupling. It is then shown that such changes in the electric field within the ionosphere induce a variety of plasma and electromagnetic phenomena associated with an impending EQ.

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Section: Basic Properties Of DC Electric Fieldsmentioning

confidence: 99%

Generation of Seismic-Related DC Electric Fields and Lithosphere-Atmosphere-Ionosphere Coupling

Сорокин¹,

Hayakawa²

2013

MAS

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“…Xu et al (2011) reported the existence of the unusual changes in latent heat flux and TEC 3 days prior to the powerful Tohoku earthquake of 11 March 2011. Klimenko et al (2011) suggested that such great TEC enhancement observed 3 days prior to the Wenchuan earthquake could be explained by combined action of seismogenic vertical electric field and internal gravity waves (IGWs) generated by the solar terminator. After removing the influence of solar radiation origin in GIM (Global Ionospheric Map) TEC, the analysis results of He et al (2012) show that the TEC around the forthcoming epicenter and its conjugate were significantly enhanced in the afternoon period of 8 March 2011, 3 days before the Tohoku earthquake.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Support vector machines for TEC seismo-ionospheric anomalies detection

Akhoondzadeh

2013

Ann. Geophys.

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Using time series prediction methods, it is possible to pursue the behaviors of earthquake precursors in the future and to announce early warnings when the differences between the predicted value and the observed value exceed the predefined threshold value. Support Vector Machines (SVMs) are widely used due to their many advantages for classification and regression tasks. This study is concerned with investigating the Total Electron Content (TEC) time series by using a SVM to detect seismo-ionospheric anomalous variations induced by the three powerful earthquakes of Tohoku (11 March 2011), Haiti (12 January 2010) and Samoa (29 September 2009). The duration of TEC time series dataset is 49, 46 and 71 days, for Tohoku, Haiti and Samoa earthquakes, respectively, with each at time resolution of 2 h. In the case of Tohoku earthquake, the results show that the difference between the predicted value obtained from the SVM method and the observed value reaches the maximum value (i.e., 129.31 TECU) at earthquake time in a period of high geomagnetic activities. The SVM method detected a considerable number of anomalous occurrences 1 and 2 days prior to the Haiti earthquake and also 1 and 5 days before the Samoa earthquake in a period of low geomagnetic activities. In order to show that the method is acting sensibly with regard to the results extracted during nonevent and event TEC data, i.e., to perform some null-hypothesis tests in which the methods would also be calibrated, the same period of data from the previous year of the Samoa earthquake date has been taken into the account. Further to this, in this study, the detected TEC anomalies using the SVM method were compared to the previous results (Akhoondzadeh and Saradjian, 2011; Akhoondzadeh, 2012) obtained from the mean, median, wavelet and Kalman filter methods. The SVM detected anomalies are similar to those detected using the previous methods. It can be concluded that SVM can be a suitable learning method to detect the novelty changes of a nonlinear time series such as variations of earthquake precursors

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“…We show that small-scale Internal Gravity Waves (IGWs) and/or seismogenic electric fields in the Earth's ionosphere can be considered as the most probable formation mechanisms of TEC disturbances, observable prior to strong midlatitude earthquakes. This fact is also marked in Hayakawa (2007) and Klimenko et al (2011). We present the GSM TIP model simulation results of the ionospheric response to the small-scale IGWs and/or seismogenic electric fields in the epicentral vicinity of the Greek earthquake of 8 January 2006.…”

Section: Introductionmentioning

confidence: 99%

Modeling of local disturbance formation in the ionosphere electron concentration before strong earthquakes

Клименко

Zakharenkova

et al. 2012

Earth Planet Sp

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In the past numerical experiments had shown that local disturbances of zonal electric fields allow reproducing the morphology of ionospheric disturbances during seismic active periods. In these numerical experiments the physical processes leading to the formation of such electric fields were not discussed. This paper offers two potential formation mechanisms of ionospheric precursors based on (1) the propagation and dissipation of smallscale internal gravity waves (IGWs) in the upper atmosphere, and (2) the penetration of a vertical electric field from the atmosphere into the ionosphere. We have simulated the effects of small-scale IGWs and the penetration of a vertical electric field for a mid-latitude earthquake in Greece using the Global Self-consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP). It is shown that the simulation results obtained with the IGWs hypothesis are in good qualitative agreement with GPS TEC data. The simulation results obtained with the vertical electric field hypothesis are in less good agreement with GPS TEC data.

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Formation mechanism of great positive TEC disturbances prior to Wenchuan earthquake on May 12, 2008

Cited by 92 publications

References 44 publications

Generation of Seismic-Related DC Electric Fields and Lithosphere-Atmosphere-Ionosphere Coupling

Generation of Seismic-Related DC Electric Fields and Lithosphere-Atmosphere-Ionosphere Coupling

Support vector machines for TEC seismo-ionospheric anomalies detection

Modeling of local disturbance formation in the ionosphere electron concentration before strong earthquakes

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