蒙甘宁地区地磁垂直分量加卸载响应比分析

Analysis on Load-unload Response Ratio of Geomagnetic Vertical Component in Inner Mongolia,Gansu and Ningxia Region

选取2008-2018年内蒙古、甘肃、宁夏及临近地区(陕)部分地磁观测数据,运用垂直分量的日变幅加卸载响应比方法,结合实际震例对所选数据进行处理,分析该方法在研究区的适用性;分析结果表明:(1)蒙甘宁地区异常判定阈值标准P(Z)为3.0较为适宜;(2)研究区内加卸载响应比高值异常与M≥4.1以上地震有较好的对应关系;(3)研究区内预期地震震中主要集中在加卸载响应比高值异常空间分布阈值线附近;(4)研究区2008—2018年的15组加卸载响应比高值中虚报率为38.5%、漏报率为15.4%,较为合理。

Using the data of Geomagnetic vertical component ratio of load-unload response in Inner Mongolia,Gansu,Ningxia and neighboring area from 2008 to 2018,the serviceability of the method though combining with earthquake cases are analyzed.The results indicate that:(1)The anomaly evaluation index which is suitable for in Inner Mongolia-Gansu-Ningxia region is 3.0;(2)The high value exception of load-unload response ratio in research area has a good correspondence with Earthquakes which M≥4.1;(3)The expected epicenters of earthquakes in the study area are mainly concentrated near the threshold line of spatial distribution of anomalies with high load-unload response ratio;(4)The false reporting rate is 38.5%and the failure rate is 15.4%,in the study area,which are reasonable in the 15 groups high value of load-unload response ratio of from 2008 to 2018.