摘要
利用红山、后土桥等台近30年的的地磁绝对观测资料,对F、H、Z各分量进行了分析,对Z分量的年速率进行了研究。结果:1999年和2000年F总场和Z分量长期变相继出现了转折,结束了逐年上升的变化趋势,但局部地区近两年有所回升。而H分量趋势没有变化,依照原来的趋势在下降;Z分量年速率的减缓变化往往与华北地区较强地震有关。
The F, H and Z component of geomagnetic data observed by some seismostations in recent 30 years, such as Hongshan, Houtuqiao, are analyzed, and the annual rate of Z component is also studied. The results show ： ended the yearly ascending tendency, the long term variation of F and Z component showed a turning respectively in 1999 and 2000, but recovered a little in some local region in recent two years; with a descending tendency, the H component did not change. The slow down of variations in Z component is usually relevant to the relatively strong earthquake in North China area.
出处
《华北地震科学》
2007年第1期1-5,共5页
North China Earthquake Sciences
关键词
长期变
年速率
转折
华北地区
long term variation
annual rate
turning
North China area
