地震研究

利用2010.0—2016.0年中国国际地磁交换台站和中国邻近地区共14个地磁台站的X,Y,Z分量观测数据,结合世界资料中心发布的静扰日数据,计算了台站十日静日午夜均值,并进行三次多项式拟合,得到X,Y,Z分量的长期变化和年变率。同时,利用CHAOS-6和IGRF-12模型计算了2010.0—2016.0年F分量的长期变化,分别得到了CHAOS-6及IGRF-12模型计算值与台站观测值的差值。结果表明:同一地区的台站X,Y,Z分量变化趋势基本一致; Z分量的平均年变率与X,Y分量相比偏大; CHAOS-6和IGRF-12模型描述的F分量的长期变化与台站观测值之间的差值的绝对值分别为4.8～253.7 nT和0.9～420.0 nT。产生上述误差的原因主要是CHAOS-6和IGRF-12模型是描述全球地磁场的模型,而地磁场及其长期变化具有显著的区域特征和局部特征。

Using the observation data(X,Y,Z components of geomagnetic field)of 4 China international geomagnetic exchange observatories and 10 geomagnetic observatories in China's neighboring regions during the period 2010.0—2016.0,and combining with the quietest and most disturbed data released by the World Data Center,we calculated the mean values at the midnight of every 10 days in the above observatories,which is fitted with cubic polynomial so as to obtain the analysis of geomagnetic secular variation and annual variation of X,Y,Z components of geomagnetic field. At the same time,using the CHAOS-6 model and the IGRF-12 model,we calculated the geomagnetic secular variation of the F component during the period 2010.0—2016.0,and obtained the difference between the calculated values of the CHAOS-6 and IGRF-12 models and the observed values of observatories respectively. The result shows that the variation trends of X,Y,Z components of observatories are basically consistent in the same area,and the average annual variability of the Z component is larger than that of the X,Y components. The absolute values of the difference between geomagnetic secular variation of the F component described by the CHAOS-6 and IGRF-12 models and the observed values of observatories are 4.8～253.7 nT and 0.9～420.0 nT,respectively. The main reason for the above error is that the CHAOS-6 model and the IGRF-12 model describ the global geomagnetic field,while the geomagnetic field and its secular variations have significant regional and local characteristics.

引言
1 地磁台站数据选取及处理方法
2 地磁台站各分量长期变化及年变率
3 地磁台站观测值与两种模型描述的F分量长期变化差异分析
4 结论

图1 中国及邻近地区14个地磁台站的分布示意图<br/>Fig.1 Distribution of the 14 geomagnetic observatories in China and its neighboring regions

图1 中国及邻近地区14个地磁台站的分布示意图
Fig.1 Distribution of the 14 geomagnetic observatories in China and its neighboring regions

图2 中国及邻近地区地磁台站X,Y,Z分量的长期变化<br/>Fig.2 Geomagnetic secular variations of X,Y,Z components at the observatories in China and its neighboring regions

图2 中国及邻近地区地磁台站X,Y,Z分量的长期变化
Fig.2 Geomagnetic secular variations of X,Y,Z components at the observatories in China and its neighboring regions

表1 2011—2015年地磁台站X,Y,Z分量十日静日午夜均值的年变率<br/>Tab.1 Annual variability of mean value of midnight in the quietest day of ten days of X,Y,Z components at the observatories from 2011 to 2015

表1 2011—2015年地磁台站X,Y,Z分量十日静日午夜均值的年变率
Tab.1 Annual variability of mean value of midnight in the quietest day of ten days of X,Y,Z components at the observatories from 2011 to 2015

图3 地磁台站X(a),Y(b),Z(c)分量十日静日午夜均值的平均年变率的等值线分布<br/>Fig.3 Contour distribution map of average annual variability of mean value of midnight in the quietestday of ten days of X(a),Y(b),Z(c) components at the observatories

图3 地磁台站X(a),Y(b),Z(c)分量十日静日午夜均值的平均年变率的等值线分布
Fig.3 Contour distribution map of average annual variability of mean value of midnight in the quietestday of ten days of X(a),Y(b),Z(c) components at the observatories

图4 地磁台站F分量观测值与CHAOS-6和IGRF-12模型描述的F分量的长期变化<br/>Fig.4 Geomagnetic secular variations of F component at the observatories and that described by CHAOS-6 and IGRF-12 models

图4 地磁台站F分量观测值与CHAOS-6和IGRF-12模型描述的F分量的长期变化
Fig.4 Geomagnetic secular variations of F component at the observatories and that described by CHAOS-6 and IGRF-12 models

表2 地磁台站F分量观测值与CHAOS-6、IGRF-12模型计算值的差值<br/>Tab.2 Difference between geomagnetic secular variations of F component and that described by CHAOS-6 model and IGRF-12 model

表2 地磁台站F分量观测值与CHAOS-6、IGRF-12模型计算值的差值
Tab.2 Difference between geomagnetic secular variations of F component and that described by CHAOS-6 model and IGRF-12 model

安振昌.2002.中国地磁测量、地磁图和地磁场模型的回顾[J].地球物理学报,45(增刊1):189-196.
安振昌.2003.2000年中国地磁场及其长期变化冠谐分析[J].地球物理学报,46(1):68-77.
陈斌,顾左文,高金田,等.2010.中国地区地磁长期变化研究[J].地球物理学报,53(9):2144-2154.
陈斌,顾左文,高金田,等.2011a.2005.0年代中国地区地磁场及其长期变化球冠谐和分析[J].地球物理学报,54(3):771-779.
陈斌.2011b.自然正交方法在地震地磁监测中的应用[J].地震研究,34(4):466-469.
陈斌,顾左文,高金田,等.2012a.IGRF-11描述的2005—2010年中国地区地磁长期变化及其误差分析[J].地球物理学进展,27(2):512-521.
陈斌,顾左文,狄传芝,等.2012b.第11代国际地磁参考场[J].国际地震动态,398(2):20-29.
丁新娟,杨福喜,贾路,等.2017.2015年新疆皮山6.5级地震前岩石圈磁场局部异常特征分析[J].地震研究,40(3):362-367.
傅承义,陈运泰,祁贵仲.1985.地球物理学基础[M].北京:科学出版社.
高金田,安振昌,顾左文,等.2006.用曲面Spline方法表示1900—1936年中国(部分地区)地磁场及其长期变化的分布[J].地球物理学报,49(2):398-407.
顾春雷,张毅,徐如刚,等.2010.地震前后岩石圈磁场变化特征分析[J].地球物理学进展,25(2):472-477.
顾左文,陈斌,高金田,等.2009.应用NOC方法研究中国地区地磁时空变化[J].地球物理学报,52(10):2602-2612.
顾左文,张毅,姚同起,等.2006.九江—瑞昌MS5.7地震地磁异常的观测与分析[J].地震学报,28(6):611-621.
康国发,白春华,高国明.2008.地磁长期变化和日长十年尺度变化的周期特征[J].地球物理学报,51(2):369-375.
倪喆,陈双贵,袁洁浩,等.2014a.芦山7.0级地震前后岩石圈地磁变化异常研究[J].地震研究,37(1):61-65.
倪喆.2014b.洱源5.5级地震前后地磁变化异常特征分析[J].地震研究,37(3):426-432.
倪喆,陈斌,崔兴平,等.2017.地震孕育过程中地下磁化率结构的变化分析[J].地震研究,40(3):382-387.
苏树朋,赵慧琴,李博,等.2017.大华北地区岩石圈磁场空间分布与地震地质特征[J].地震研究,40(3):345-351.
王粲,袁洁浩,王振东.2017.基于2008年CHAMP卫星地磁总强度数据分析中国及邻区地磁异常特征[J].地震研究,40(3):399-403.
王振东,顾左文,陈斌,等.2017.CHAOS-6模型描述的中国地区地磁长期变化及误差分析[J].地震研究,40(3):404-410.
徐文耀,魏志刚,夏国辉.2005.2000年中国地区地磁场长期变化的区域特征[J].地球物理学报,48(3):551-560.
徐文耀.2003.地磁学[M].北京:地震出版社.
徐文耀.2014.地磁活动性概论[M].北京:科学出版社.
张忠龙,赵育飞,顾健,等.2017.小江断裂带及邻区岩石圈磁场变化特征分析[J].地震研究,40(3):372-376.
Barraclough D.1987.International geomagnetic reference field:The fourth generation[J].Phys Earth Planet Int,48(3):279-292.
Barton C.1997.International geomagnetic reference field:The seventh generation[J].J Geomag Geoelect,49(2-3):123-148.
Finlay C C,Olsen N,Kotsiaros S,et al.2016.Recent geomagnetic secular variation from Swarm and ground observatories as estimated in the CHAOS-6 geomagnetic field model[J].Earth Planets Space,68(1):112.
Finlay C C,Olsen N,Toeffner-Clausen L.2015.DTU candidate field models for IGRF-12 and the CHAOS-5 geomagnetic field model[J].Earth Planets Space,67(1):114.
Langel R.1992.International geomagnetic reference field:The sixth generation[J].J Geomag Geoelect,44(9):679-707.
Olsen N,Luehr H,Finlay C C,et al.2014.The CHAOS-4 geomagnetic field model[J].Geophys J Int,197(2):815-827.
Olsen N,Luehr H,Sabaka T J,et al.2006.CHAOS-a model of Earth's magnetic field derived from CHAMP,Ørsted,and SAC-C magnetic satellite data[J].Geophys J Int,166(1):67-75.
Olsen N,Mandea M,Sabaka T J,et al.2009.CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data[J].Geophys J Int,179(3):1477-1487.
Olsen N,Mandea M,Sabaka T J,et al.2010.The CHAOS-3 geomagnetic field model and candidates for the 11th generation of IGRF[J].Earth Planets Space,62(10):719-727.
Peddiie N W.1982.International geomagnetic reference fied:The third generation[J].J Geomag Geoelect,34(6):309-326.
Thébault E,Finlay C C,Beggan C D,et al.2015.International geomagnetic reference field:The 12th generation[J].Earth Planets Space,67(1):79.
Wang Z,Chen B,Yuan J,et al. 2018. Localized geomagnetic field anomalies in an underground gas storage[J]. Phys Earth Planet Inter,283:92-97.
Wang Z,Yuan J,Chen B,et al. 2019. Local magnetic field changes during gas injection and extraction in an underground gas storage[J]. Geophys J Int,217:271-279.
Zmuda A.1971.The international geomagnetic reference field:Introduction[J].Bull Int Assoc Geomag Aeronomy,28:148-152.

备注

引言

1 地磁台站数据选取及处理方法

2 地磁台站各分量长期变化及年变率

3 地磁台站观测值与两种模型描述的F分量长期变化差异分析

4 结论

期刊信息