Research Papers

Multiparameter seismo-ionospheric anomaly observation before the 2008 Wenchuan, China, Mw7.9 earthquake

[+] Author Affiliations
Yan Xiangxiang

Institute of Geology, China Earthquake Administration, State Key Laboratory of Earthquake Dynamics, Beijing 100029, China

Shan Xinjian

Institute of Geology, China Earthquake Administration, State Key Laboratory of Earthquake Dynamics, Beijing 100029, China

Zhang Xuemin

Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China

Qu Chunyan, Tang Ji

Institute of Geology, China Earthquake Administration, State Key Laboratory of Earthquake Dynamics, Beijing 100029, China

Wang Feifei

China Research Institute of Radio Wave Propagation, Qingdao 266107, China

Wen Shaoyan

Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China

J. Appl. Remote Sens. 7(1), 073532 (Jul 19, 2013). doi:10.1117/1.JRS.7.073532
History: Received February 5, 2013; Revised May 2, 2013; Accepted May 6, 2013
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Abstract.  The atmosphere-ionosphere response before 2008 Mw7.9 Wenchuan earthquake based on global positioning system (GPS), detection of electro-magnetic emission transmitted from earthquake regions (DEMETER), and National Oceanic and Atmospheric Administration—advanced very high resolution radiometer (NOAA/AVHRR) satellite data is analyzed. It is found that GPS total electron content (TEC) above the epicenter continuously decreased in the afternoon periods from 6 to 10 May but increased in the afternoon of 9 May. Contour analysis on ionospheric plasma using Instrument Sonde de Langmuir data onboard DEMETER satellite showed that electron density (Ne) and ion density (Ni) was also reduced from 6 to 10 May, the anomalous region mainly distributed in the south of the epicenter, conforming to the anomalous TEC area. The brightness temperature (Tb) from NOAA/AVHRR data, calculated by K index method, shows a noticeable enhancement on the northwest side of the epicenter on 7 May, while ion temperature (Ti) from DEMETER data increased on 9 May with the order of 12.5%. The energetic particle flux presents an obvious enhancement for the spectrum at 100 to 600 keV energy range on 6 May. Preliminary study suggests the perturbations of these parameters (TEC, Ne, Ni, Tb, and Ti) before the Wenchuan earthquake may be related to the changes of vertical electric field in the atmosphere and ionosphere, induced by the enhancement of stress in tectonic regions and the electromagnetic signal propagation from the earthquake preparation area.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Yan Xiangxiang ; Shan Xinjian ; Zhang Xuemin ; Qu Chunyan ; Tang Ji, et al.
"Multiparameter seismo-ionospheric anomaly observation before the 2008 Wenchuan, China, Mw7.9 earthquake", J. Appl. Remote Sens. 7(1), 073532 (Jul 19, 2013). ; http://dx.doi.org/10.1117/1.JRS.7.073532


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