地磁异常识别技术在松原5.7级地震前的应用研究

Application of Geomagnetic Anomaly Identification Technology Before Songyuan M5.7 Earthquake

运用地磁异常识别技术对2018年5月28日松原5.7级地震前的地磁异常展开研究。采用加卸载响应比法、逐日比法、日变化空间相关法、异常叠加法对吉林省三岗台、通化台及东北地区邻近的大连台、营口台、朝阳台、铁岭台等台站,运用松原5.7级地震前18个月内的地磁预处理分钟值数据进行计算分析和异常判定识别。研究结果表明:在加卸载响应比法、逐日比法和日变化空间相关法的基础上,运用异常叠加法提取的地磁异常,其预测的位置与真实值更加接近,预测结果对省内地震具有重要的指示意义。

The paper uses the geomagnetic anomaly identification technology to study the geomagnetic anomaly before the Songyuan M5.7 earthquake on May 28,2018.It uses the load-unload response ratio method,daily comparison method,daily variation spatial correlation method,and anomaly superposition method to calculate,analyze,and identify anomalies at 10 stations located at northeast of China,including Sangang Station,Tonghua Station,Dalian Station,Yingkou Station,Chaoyang Station,Tieling Station,etc,using the minute value data of geomagnetic preprocessing within 18 months before the Songyuan 5.7 earthquake.The results of the research show that on the basis of the load-unload response ratio method,the daily comparison method and the daily variation spatial correlation method,the predicted position of the geomagnetic anomaly extracted by the anomaly superposition method is closer to the true value,and the pre‐diction results have more important and significant indication for earthquakes in the province.