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Zhang Suqin,Yang Dongmei,Li Qi,Zhao Yongfen
Author NameAffiliation
Zhang Suqin Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 
Yang Dongmei Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 
Li Qi Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 
Zhao Yongfen Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 
摘要:
关键词:  天文台 地震预报 观测 研究 中国
DOI:
分类号:
基金项目:
The Study of Two Geomagnetic Jerks in China
Zhang Suqin,Yang Dongmei,Li Qi,Zhao Yongfen
Abstract:
This paper analyzes the first differences of the annual means (annual rate) for the Y and Z components of the geomagnetic field from nine magnetic observatories in China, measured from 1985 to 2003. The 1991 jerk was obvious in the Y component measured but not clear for the Z component. Rapid changes in the Z components were ubiquitous around 2000-2001, but not seen for the Y component. External effects were removed from the monthly means by comparing the monthly mean of the geomagnetic field components at the observatories with the monthly time series of the A_p geomagnetic index. However, some examples were analyzed and showed whether external effects were removed or not, there was no marked distinction in determining the jerks in China for the Y component and the Z component of the geomagnetic field. Finally, the isolines of the first differences of the annual means were used to analyze the spatial and temporal distributions of the jerks.
Key words:  Jerk  Annual rate  External field  Isolines  A_p index