双阳水管地倾斜观测在松原地震前后的异常变化  

Anomalous Changes of Shuangyang Water Tube Tiltmeter Observation Before Songyuan Earthquakes

作　　者：唐春呈 郑传芳[1] TANG Chun-cheng;ZHENG Chuan-fang(Jilin Earthquake Agency,Jilin Changchun 130117,China)

机构地区：[1]吉林省地震局,吉林长春130117

出　　处：《防灾减灾学报》2018年第3期29-33,共5页Journal of Disaster Prevention And Reduction

摘　　要：选择双阳地震台DSP型水管倾斜仪日均值观测数据和地倾斜潮汐因子作为研究对象,利用形态法和Venediov调和分析方法,对2006年吉林乾安—前郭M5.0地震和2013年吉林前郭M5.8地震发生前后双阳水管倾斜仪的异常变化特征进行研究。结果表明:(1)双阳水管地倾斜观测数据在两次地震前均存在异常变化,即地倾斜观测日均值数据在两次地震发生前1～2年呈趋势性下降(或年变幅减小)变化,并在下降过程中发震,震后1～2年恢复,潮汐因子在地震前后1～2年内波动很大;(2)跨断层测项的水管仪器观测异常明显,且两次震前出现异常都是以跨段层的南北测项为主,东西测项为辅,说明在相同应力的作用下,不完整的块体更容易产生变形。This paper chose daily mean value of Shuangyang DSP water tube inclinometer and ground tilt tidal factor as studying objects, and studied the variation features of the objects before Qian＇an M5.0 earthquake and Qianguo M5.8 earthquake swarm by applying morphological method and Venediov harmonic analysis method. Through analysis, the conclusion is that： （1） Shuangyang water tube tiltmeter observation has precursory variation before Songyuan earthquakes. The daily mean value of Shuangyang water tube tiltmeter had a tendency decline for one or two years before earthquake （or yearly amplitude of variation decreases）. Earthquake occurred during the declining process, then restored to original vaue in one or two years after earthquake; tidal factor fluctuated dramatically in one or two years before and after earthquakes. （2） The abnormal of the water pipe tube observation across the fault survey is very obvious. The precursory anomalies that existed before two earthquakes are dominated by the north-south measured item in the stratum layer, supplemented by east-west measurement, indicating that under the effect of the same stress, incomplete blocks are easier to deformate.

关 键 词：松原地震 水管倾斜仪 潮汐因子 双阳台 

分 类 号：P315.72[天文地球—地震学]