云南盈江MS 6.1地震前兆异常特征分析*
李 琼,付 虹,钱晓东

(云南省地震局,云南 昆明650224)

盈江MS6.1地震; 前兆异常; 时空演化特征

Analysis on Characteristics of Precursory Anomalies of Yingjiang MS6.0 Earthquake in Yunnan
LI Qiong, FU hong, QIAN Xiaodong

(Earthquake Administration of Yunnan Province, Kunming 650224, Yunnan, China)

Yingjiang MS6.0 earthquake; precursory anomalies; temporal-spatial evolution characteristics

备注

通过对2014年5月30日盈江MS6.1地震前距离震中450 km范围内所有前兆观测资料进行分析,提取震前异常,总结异常特征。研究结果表明:前兆异常在时间上具有阶段性特征,中、短期阶段,震前1年左右异常数量开始增加; 短临阶段,震前1～2月异常数量增加、速率加大,同时有部分前兆趋势异常出现转折结束。前兆异常在空间上比较分散,但距离震中200 km范围内的异常数量比例比震中距200～450 km范围内的大。水温、流量、水氡、气汞测项的映震效果最好。

Analyzing all the precursory observation data in the range from the epicenter of 450 km before Yingjiang MS6.0 earthquake on May.30, 2014, we extracted the precursory anomaly information and summarized the characteristic of the anomalies, and found that the precursor anomalies had the characteristic of periodic variation. In the medium and short-term stages, the number of abnormal items began to increase about a year before the earthquake; in the short-term and impending stages, the growth rate of the number of abnormal item began to speed up about 1～2 months before the earthquake, at the same time, the partial precursor trend anomalies began to turn over. The spatial distribution of the precursory anomalies was relatively dispersed, however, the proportion of abnormal items in the range from the epicenter of ≤200 km was still higher than that in the range from the epicenter of >200 km. The effect of the corresponding earthquake of the water temperature, flow, water Radon and gas mercury was the best.