以2008年5月12日汶川Ms8.0地震为例,利用电离层层析成像技术重建了震前5月8-10日震中附近上空电离层的电子密度分布(UT9:00),发现5月9日出现电离层异常,且该异常在时空上与同一时段的电离层VTEC异常分布结果一致(排除空间天气活动对电离层造成的可能干扰后),认为该异常即是地震的电离层前兆信息.研究表明:电离层层析成像技术在地震预测研究领域有广阔的应用前景.%The technology of Computerized Ionospheric Tomography was used to reconstruct the distribution of electron density on UT9:00 from May 8th, to May 10th, 2008 before Wenchuan Ms8. 0 earthquake that occurred on May 12th. It is found that an ionospheric anomaly had taken place on May 9th, and the aspect about when and where this anomaly occurred is consistent with the conclusion made by VTEC analysis. After eliminating the possible impacts that space weather event existed in the ionosphere, we can undoubtedly maintain that the ionospheric anomaly on May 9th is a precursor of Wenchuan earthquake. Integrating all mentioned above, our study indicates that Computerized Ionospheric Tomography has great opportunities to be widely applied in the field of earthquake prediction.
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