摘要
四川流动地磁测量布设于鲜水河断裂带的甘孜—泸定一带,共103个测点,观测地磁总场F的变化。1985年—1989年共测6期。本文利用多台平均差值法及趋势面分析方法研究的结果表明,在1989年巴塘、小金及石棉等中强地震前,差值曲线有6—8nT的变化,把磁总场F年变增强方向由东北转向西南,转折时间为1987—1988年;泰勒多项式的α系数及残差分析结果也有相应的反映。
From 1985 to 1989,geomagnetic total intensity had been measured for 6 times along rhe Ganzi-Luding geomagnetic observatory networks with 103 sites distributed over the Xianshuihe Fractures. By means of multistation averaging and trend analysing,We studied the measurde data and found that before the Batang, Xiaojin and Shimian earthquakes as well as other events occured in Sichuan during 1989,there were variations of 6-8 nT between two continual measurements. The annual variation of geomagnetic total intensity F increased with a diversion from Northeast to Southwest during 1987-1988. The analysis of the coefficent a of Tailor polynome and the residual error also reflect the phenomena.
出处
《中国地震》
CSCD
北大核心
1991年第2期55-61,共7页
Earthquake Research in China
