地磁加卸载响应比与宁强MS5.3地震

Geomagnetic Loading-Unloading Response Ratio and the Ningqiang MS5.3 Earthquake

摘要:

2018年9月12日19时6分在陕西省宁强县（32.75°N，105.69°E）发生M_S5.3地震，震源深度11 km。以宁强县及其周边420 km为研究区域，使用地磁垂直分量Z加卸载响应比的方法，对陕-川-甘地区的汉中、周至楼、乾陵、泾阳、成都、天水和兰州七个地磁台站的资料进行处理分析，发现加卸载响应比P（Z）的高值异常与此次宁强县地震有较好的对应，为今后中短期预报提供一定的依据，也进一步推广和检验了地磁加卸载响应比在地震预报方面的应用。

Abstract:

On September 12, 2018, an M_S5.3 earthquake with a focal depth of 11 km occurred in Ningqiang County, Shaanxi Province (32.75°N, 105.69°E). In this work, Ningqiang County and its surrounding areas (within the radius of 420 km) were taken as the study areas. Data from seven geomagnetic stations located in Hanzhong, Zhouzhilou, Qianling, Jingyang, Chengdu, Tianshui, and Lanzhou were processed and analyzed by using the loading-unloading response ratio method of the geomagnetic Z component. Results showed that high values of abnormal changes in the load-unloading response ratio P(Z) had a strong correspondence with the Ningqiang M_S5.3 earthquake. The results of this study can provide a basis for mid-short term earthquake prediction in the future. Meanwhile, the application of the loading-unloading response ratio method in earthquake prediction warrants further promotion and testing.