肇庆台数字化地磁观测资料震磁关系的分析研究

使用肇庆地磁台2003～2005年的高精度数字化地磁观测资料,采用地磁短周期转换函数、加卸载响应比等方法,系统地分析研究了肇庆地磁台周边地区在此期间的震磁异常对应关系。研究结果表明,在2004年9月17日阳江M_L 5．2级地震前,肇庆地磁台的地磁短周期转换函数A、B,加卸载响应比P(Z)均有比较明显的前兆异常。该异常具有中期异常特征,而对临震异常特征识别则不好区分和把握。

Analysis and Research on Seismo-Magnetic Relation by Using the Digital Geomagnetic Observation Data from Zhaoqing Observatory

Based on the high accuracy digital geomagnetic data observed at Zhaoqing geomagnetic observatory from Jan.2003 to Dec.2005,applying the seismic-magnetic relation research methods such as geomagnetic short-period transfer function,load and unload response ratio and so on,we systematically analyzed the seismo-magnetic anomaly corresponding relation arround Zhaoqing geomagnetic observatory during this period.The result shows that A,B value of geomagnetic short-period transfer function and P(Z)value of load and unload response ratio are obviously anomalous before the Yangjiang M_LS.2 earthquake on September 17,2004.There are the signs of medium term precursor anomalies,but short term anomalies are not obvious.