Recent progress in ionospheric earthquake precursor study in China: A brief review

Le, Huijun; Liu, Jing; Liu, Libo

doi:10.1016/j.jseaes.2015.06.024

Cited by 18 publications

(8 citation statements)

References 87 publications

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“…The study of the anomalous ionospheric variations before earthquakes has attracted the attention of geophysicists for many years, which has also been considered to be a possible method to identify the ionospheric earthquake precursors. Le et al [59] gave a brief summary of the recent progresses in this field. It is not confirmed whether these anomalies are really related to incoming earthquakes; there are many debates or doubts regarding this in the community.…”

Section: Ionospheric Climatology and Structuresmentioning

confidence: 99%

New understanding achieved from 2 years of Chinese ionospheric investigations

Liu

Wan

2016

Science Bulletin

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Section: Ionospheric Climatology and Structuresmentioning

confidence: 99%

New understanding achieved from 2 years of Chinese ionospheric investigations

Liu

Wan

2016

Science Bulletin

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“…The abnormal ionospheric plasma density variations before and/or after earthquakes have attracted much attention from the geophysicists for many years (e.g., Pulinets and Boyarchuk, 2004;Le et al, 2015). In general, ionospheric measuring techniques are categorized as ground and space observations to obtain the ionospheric parameters (Xiong et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Using a Spatial Analysis Method to Study the Seismo-Ionospheric Disturbances of Electron Density Observed by China Seismo-Electromagnetic Satellite

et al. 2022

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Due to the complex processes of earthquake preparation, the observations and studies associated with earthquakes have attracted the attention of geophysicists for many years. The CSES was successfully launched on 2 February 2018. This satellite can provide global data of the electromagnetic field, plasma, and energetic particles in the ionosphere to monitor and study the ionospheric perturbations associated with earthquakes. Focusing on the characteristics of CSES, a spatial analysis method was proposed to extract the disturbances of electron density prior to earthquakes. Taking Indonesia Mw6.9 earthquake that occurred on 5 August 2018 as an example, the spatial method was illustrated and verified by another analysis method also using the data of electron density and GPS TEC data with the same analysis method. Based on the electron density of CSES for more than 2 years, this method was applied to carry out the statistical study prior to Mw ≥ 6.0 global earthquakes using the superposed epoch and space approach (SESA) method. It was found that 1) relative to the epicenters, seismo-ionospheric disturbances are more obvious in the equator direction than those in the polar direction; 2) the anomalies within 300 km distance from the epicenter are significant 11, 3, and 2 days prior to Mw ≥ 6.0 earthquakes; 3) the influence region of perturbances associated with earthquakes enlarges with the magnitude increase, and the stronger magnitude is the earlier disturbance appears. These statistical characteristics were not detected for the random earthquakes. Comparing the statistical result with the simulation output, the electric field pathway could be considered as the main channel of lithosphere–atmosphere–ionosphere coupling.

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“…The abnormal ionospheric density variations before and/or after earthquakes have attracted much attention from the geophysicists for many years (e.g., Pulinets & Boyarchuk, 2004a;Le et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Ionospheric total electron content anomaly possibly associated with the April 4, 2010 Mw7.2 Mexico earthquake

Liu

Wang

Zhang

2020

Preprint

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Abstract. Identifying ionospheric disturbances potentially related to an earthquake is a challenging work. Based on the ionospheric total electron content (TEC) data from the madrigal database at the Haystack Observatory, Massachusetts Institute of Technology, a new decomposition and nonlinear fitting method has been developed and applied in this work to extract the TEC disturbances that are potentially related to the Mw7.2 Mexico earthquake occurred on April 4 2010. By analyzing the TEC data for a long period of time (72 days) before and after the earthquake, we found that a unique TEC depletion occurred in the region around the epicenter on March 25. No other significant ionospheric TEC anomalies were identified in the 72-day period around the earthquake, except some TEC disturbances that appeared to be related to the geomagnetic activity between April 1 and 6, 2010. We further analyzed the TEC data from other magnetically quiet days, and no TEC anomaly like that occurred on March 25 was detected. The TEC data calculated from a first principles model SD-WACCM-X were also analyzed using the same method as that for the observational data. No TEC anomaly was found on March 25 from the model outputs either. Thus the source of the TEC anomaly on March 25 is unlikely from the lower atmosphere waves. In this study, we show the occurrence of TEC anomaly on March 25, 10 days before the Mw7.2 Mexico earthquake and this TEC anomaly may not be explained by lower atmosphere or geomagnetic activity forcing.

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Recent progress in ionospheric earthquake precursor study in China: A brief review

Cited by 18 publications

References 87 publications

New understanding achieved from 2 years of Chinese ionospheric investigations

New understanding achieved from 2 years of Chinese ionospheric investigations

Using a Spatial Analysis Method to Study the Seismo-Ionospheric Disturbances of Electron Density Observed by China Seismo-Electromagnetic Satellite

Ionospheric total electron content anomaly possibly associated with the April 4, 2010 Mw7.2 Mexico earthquake

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