2011年6月20日和8月9日，云南腾冲地区先后发生MS 5.2地震，构成腾冲MS 5.2双震。2次腾冲MS 5.2地震前，地震地球物理异常集中分布在震中100 km范围的近场区，对2次地震近场区内水位、形变（水平摆观测）、水氡、水温、流量等地球物理观测资料进行综合分析，分析发现：①大部分异常持续时间在3个月以上，部分异常始于2010年初，显著中期异常测项为腾冲滇19井水位和腾冲水平摆倾斜观测；②2次地震发震前2个月，龙陵邦腊掌水氡测项出现高值异常；③临震阶段，6月20日腾冲MS 5.2地震前，腾冲荷花塘、热海大滚锅出现明显宏观异常，震后异常强度和频率明显增强，对8月9日腾冲MS 5.2地震有明显指示意义。值得注意的是，在震中85 km范围内，2011年3月10日发生盈江MS 5.8地震，2次腾冲地震的中期异常成为此次盈江地震“共同的地震地球物理异常”，且震后部分异常持续，并出现新的异常，表现出异常时空演化过程与地震活动迁移相匹配的特征。
On June 20 and August 9, 2011, the Tengchong area in Yunnan Province experienced two MS5.2 earthquakes, forming the Tengchong MS5.2 double earthquakes. Before the two Tengchong MS5.2 earthquakes, geophysical anomalies were concentrated in the near-field area within 100 km of the epicenter. A comprehensive analysis of geophysical observation data such as water level, deformation (horizontal pendulum observation), water radon, water temperature, and flow in the near-field area of the two earthquakes revealed that:① most anomalies lasted for more than 3 months, and some began in early 2010. The significant mid-term anomaly measurement items were the water level of the Dian 19 well and the horizontal pendulum tilt observation in Tengchong;② Two months before the two earthquakes, there was a high-value anomaly in the water radon measurement item at Longling Bangla Zhang;③ During the pre-earthquake stage, before the Tengchong MS5.2 earthquake on June 20, there were obvious macroscopic anomalies in the Tengchong Hehuatang and Rehai Dagunguo. The intensity and frequency of the anomalies significantly increased after the earthquake, which has a clear indicative significance for the Tengchong MS5.2 earthquake on August 9. It is worth noting that within a range of 85 km from the epicenter, the Yingjiang MS5.8 earthquake occurred on March 10, 2011. The mid-term anomalies of the two Tengchong earthquakes became the “common geophysical anomaly” of this Yingjiang earthquake, and some anomalies persisted after the earthquake, with new anomalies appearing, showing characteristics that match the abnormal spatiotemporal evolution process with seismic activity migration.
2024,45(2): 34-43 收稿日期：2023-05-09
DOI：10.3969/j.issn.1003-3246.2024.02.005
作者简介：马学智（1978—），女，工程师，主要从事地震监测预报和流体学研究工作。E-mail：786795293@qq.com
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