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2014年8月3日云南省鲁甸发生了6.5级地震。针对震前电离层异常问题,利用IGS提供的全球电离层数据,采用滑动四分位法对鲁甸地震震中及其周围格网点的TEC进行异常探测,发现震前3d、6d和13d电离层有明显的异常,其中震前3d、6d的异常最为显著。在进一步分析了太阳地磁活动及这几天的全球TEC异常分布后,认为这3d的电离层异常可能与震前的孕育地震有关。另外,这3d的TEC异常分布区域都满足在经度方向跨度和纬度方向跨度长度比约为3∶1,且异常的峰值点并不位于震中的正上方,而是位于震中偏向赤道方向,同时赤道共轭区域也存在异常,但范围和幅度都较小。
On August 3, 2014, a magnitude 6.5 earthquake occurred in Ludian, Yunnan Province. Aiming at the anomalous ionospheric anomalies before the earthquake, using the global ionospheric data provided by IGS, we use the sliding quadrant method to detect the TEC of the epicenter in and around the Ludian earthquake. It is found that the ionosphere on the 3d, 6d and 13d before the earthquake Obvious abnormalities, of which 3d, 6d before the earthquake the most significant anomalies. After further analysis of the solar geomagnetic activity and the global TEC anomaly distribution over the past few days, it is considered that the 3d ionospheric anomaly may be related to the pre-earthquake geocentric earthquake. In addition, the 3D TEC anomaly distribution area meets the requirement that the ratio of span length and latitude span is about 3: 1 in longitude direction, and the abnormal peak point is not located directly above the epicenter but in the epicenter direction while the equator The conjugate region is also abnormal, but the range and amplitude are small.