摘要
应用差分法分析了高淳台、溧阳台、高邮台、连云港台、宿迁台、海安台地磁垂直分量Z的变化,以加卸载响应比方法研究地磁极值的变化,用Z极小值时间进行地磁低点位移分析,对这些台站资料进行相关分析,研究发现中强震前高淳台的地磁场存在明显的异常变化。
The geomagnetic Z-component observation data from the Gaochun,Liyang,Gaoyou,Lianyungang,Suqian and Haian seismic station are analyzed using finite difference method.Then,the extremal value of the observation data is studied using the method of loading-unloading response ratio.The geomagnetic low-point displacement is also analyzed using minimum value time of the geomagnetic Z-component.The result shows that geomagnetic filed at Gaochun seismic station changes obviously before moderate-strong earthquake.
出处
《华北地震科学》
2011年第2期49-52,共4页
North China Earthquake Sciences
关键词
地磁异常
地磁场
加卸载响应比
高淳台
geomagnetic anomaly
geomagnetic field
loading-unloading response ratio
GaoChun seismic station
