GPS total electron content and surface latent heat flux variations before the 11 March 2011 M9.0 Sendai earthquake |
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Authors: | Tong Xu Zhi Chen Chunbin Li Jian Wu Yanli Hu Zhensen Wu |
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Institution: | 1. National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China;2. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;3. School of Science, Xidian University, Shannxi, Xi’an 710071, China |
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Abstract: | The present paper describes the variations of the GPS total electron content (TEC) from the International GNSS service network and surface latent heat flux (SLHF) from the Scientific Computing Division of the National Center for Atmospheric Research (NCAR) before the 11 March 2011 M9.0 Sendai earthquake, respectively. The analysis shows pronounced enhancements in the GPS TEC and SLHF a few days prior to the earthquake event. The maximum increase in the GPS TEC was about 30 TECu with an extended spatial distribution on a geomagnetically quiet day (Dst ? −20 nT, between two moderate geomagnetic storms), 8 March, 3 days prior to the earthquake. This giant positive disturbance was possibly associated with the impending disastrous earthquake and contributed from the enhanced solar radiation. Moreover, there were several anomalous regions of SLHF on the global map, but an area of enhanced SLHF very close to the epicenter. The purpose of this paper is to report the existence of the changes in surface and ionosphere, and show the potential application of multi-source data to identify seismic precursors. |
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Keywords: | Total electron content Surface latent heat flux Earthquake |
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