| 中国部分地磁台站年均值与IGRF模型一致性分析 |
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| 引用本文： | 张素琴,杨冬梅,李琪,赵永芬.中国部分地磁台站年均值与IGRF模型一致性分析[J].地震地磁观测与研究,2008,29(2):42-49. |
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| 作者姓名： | 张素琴 杨冬梅 李琪 赵永芬 |
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| 作者单位： | 中国北京,100081,中国地震局地球物理研究所 |
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| 摘 要： | 利用中国部分地磁台站1990～2003年的年均值资料，研究了台站年均值与IGRF模型计算值的一致程度，结果表明：①我国地磁台站的长期变速度与IGRF模型的长期变速度有差异：总体来讲，我国台站磁偏角D和垂直强度Z的长期变速度低于IGRF模型的相应速度；水平强度H的长期变速度在1990～1995年间高于IGRF模型的相应速度，在1995～2000年间低于IGRF模型的相应速度；②台站年均值与IGRF模型值的差值曲线中，H和Z有明显的起伏，反映了地磁场长期变的非线性；③虽然有上述长期变上的差异，但对于同一个台站，各地磁要素年均值与IGRF模型值的差值的标准偏差均低于IGRF模型的误差水平，说明IGRF模型与台站年均值的一致性比较好；④对于同一地磁要素，不同台站的年均值与IGRF模型值的差值的平均值相差较大，反映出台站所在位置地壳磁异常的巨大差异。通过总结上述工作，文中还讨论了地磁台站保持长期可靠运行的重要性以及地磁台网历史观测资料抢救的紧迫性。
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| 关 键 词： | 地磁 台网 IGRF年均值 一致性 |
| 文章编号： | 1003-3246(2008)02-0042-08 |
| 修稿时间： | 2007年8月20日 |
The consistence analysis of IGRF model value and annual mean value of some geomagnetic observatories in China |
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| Zhang Suqin,Yang Dongmei,Li Qi,Zhao Yongfen.The consistence analysis of IGRF model value and annual mean value of some geomagnetic observatories in China[J].Seismological and Geomagnetic Observation and Research,2008,29(2):42-49. |
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| Authors: | Zhang Suqin Yang Dongmei Li Qi Zhao Yongfen |
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| Institution: | (Institute of geophysics. China Earthquake Administration, Beijing 100081, China) |
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| Abstract: | Utilizing 1990～2003 annual mean values of our some geomagnetic observations, the consistency of annual mean value and IGRF model value are analyzed in this paper. The result shows： ① the secular rate is difference between observatory and IGRF model. Generally speaking, for D and Z, the secular rates of observatories are lower than those of IGRF model; for H, the secular rate of observatories is higher than that of IGRF model within 19904～1995, lower than the corresponding rate of IGRF model within 1995～2000. ② In the curve, H and Z have obvious wave, which reflect the non-linearity of the secular variation. ③ For the same observatory, the standard deviation of difference between annual mean value and IGRF model value is lower than IGRF model error in every element, proving that the consistency of IGRF model values and annual mean values are better. ④ For the same geomagnetic element, average of difference of annual mean value and IGRF model value is differing greatly, reflecting the crust geomagnetic anomalies in the region where the observation lies. Through summarizing the work mentioned above, the importance to keep the geomagnetic observatories running for a long time, and the urgency to retrieve the history materials of the geomagnetic network are also discussed in this paper. |
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| Keywords: | geomagnetic international geomagnetic reference field annual mean value consistence |
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