【摘要】 在分析了2014年4月5日、8月17日永善5.2和5.0级地震及8月3日鲁甸6.5级地震前滇东北地区定点前兆异常的基础上,总结了前兆异常特征。研究结果表明,临近地震发生的短临阶段,前兆异常数量明显增多,永善5.2级地震的异常主要集中出现在震前3个月前后,鲁甸6.5级地震的异常主要集中出现在震前1个月左右;空间上前兆异常分布比较集中,大多观测点有2个以上测项出现异常;鲁甸6.5级地震的异常数量是永善5.2级地震的近2倍,地震震级与异常数量呈正相关;鲁甸6.5级和永善5.0级地震的发震时间相隔14天,震前异常无法明确区分。更多还原

【Abstract】 In this paper,the fixed point precursory anomalies in Northeast of Yunnan Province before Yongshan5. 2,5. 0 and Ludian 6. 5 earthquakes on 5 April,17 August and 3 August 2014 respectively are analyzed. At the same time,the characteristics of anomalies are summarized. The result show that during the short time,the quantity of precursory anomalies significantly increased. The anomalies mainly concentrated in period of 3 months before Yongshan 5. 2 earthquake,and the anomalies of Ludian 6. 5 earthquake concentrated in about 1 month. More are concentrated in the spatial distribution of anomalies. And most of observation points have 2 or more anomalies. Abnormal quantity before the Ludian 6. 5 earthquake is 2 times that before the Yongshan 5. 2 earthquake. The magnitude is positively correlated with the number of anomalies. Yongshan 5. 0 earthquake occurred 14 days after Ludian6. 5 earthquake. Their precursory anomalies cannot be clearly distinguished.更多还原