2006～2010年云南东部地区磁偏角变化特征*
倪 喆1,2,李春光2,陈 斌3,袁洁浩3,狄传芝3

(1.北京大学 地球与空间科学学院,北京 100871; 2.云南省地震局,昆明 650224; 3.中国地震局地球物理研究所,北京 100081)

曲面样条模型; 磁偏角异常; 云南东部地区

Variation of Geomagnetic Declination in East Yunnan from 2006 to 2010
NI Zhe1,2,LI Chun-guang2,CHEN Bin3,YUAN Jie-hao3,DI Chuan-zhi3

(1.School of Earth and Space Sciences,Peking University,Beijing 100871,China)(2.Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)(3.Institute of Geophysics,CEA,Beijing 100081,China)

surface spline model; anomaly of geomagnetic declination; east Yunnan

备注

利用2006～2010年云南东部地区9期地磁三分量观测资料,经过日变改正、长期变化改正消除地磁场的日变化及长期变化影响,计算各期地磁内源场的曲面样条模型并剥离出地磁异常场分布,求解相邻两期地磁异常场差异获取地磁异常场的变化,并对磁异常场中磁偏角分布的变化进行了描述。

Using nine-term of three-component geomagnetic data observed in the eastern area of Yunnan Province from 2006 to 2010,we eliminate the effects of the diurnal variation and the secular variation of the geomagnetic field through correction,calculate each term's surface spline model of the interior geomagnetic field,separate the distribution of the geomagnetic anomalous field,and get the differences between two successive terms of the geomagnetic anomalous field and acquire the variation of the geomagnetic anomalous field.Finally,we describe the variation of the distribution of the geomagnetic declination in the geomagnetic anomalous field.