CAJ | 학술논문

中国地震局地球物理研究所与蒙古科学院天文与地球物理研究中心于2011—2012年合作开展了蒙古119个野外地磁测点的测量工作．本文利用蒙古119个测点准确可靠的地磁数据，分别加上9组边界点 EMM2010模型计算值，得到了蒙古2010．0年代地磁异常场的9个球冠谐和模型；给出了地磁异常场北向分量ΔX 、东向分量ΔY 和垂向分量ΔZ 的等值线分布图，并比较分析了这9个模型的异同；同时计算了119个测点的地磁测量值与模型计算值之差的均方根误差σ，以σ为指标来表征这9个模型的精度，由此定量评价了边界点选取对模型精度的影响．结果表明，适当引入边界点能够提高模型精度，而远离测区3°—5°的均匀边界点也能起到改善模型精度的作用．因此在实际建模时，应当在计算区域边界引入适当的边界点，以改善地磁模型的精度．
중국지진국지구물리연구소여몽고과학원천문여지구물리연구중심우2011—2012년합작개전료몽고119개야외지자측점적측량공작．본문이용몽고119개측점준학가고적지자수거，분별가상9조변계점 EMM2010모형계산치，득도료몽고2010．0년대지자이상장적9개구관해화모형；급출료지자이상장북향분량ΔX 、동향분량ΔY 화수향분량ΔZ 적등치선분포도，병비교분석료저9개모형적이동；동시계산료119개측점적지자측량치여모형계산치지차적균방근오차σ，이σ위지표래표정저9개모형적정도，유차정량평개료변계점선취대모형정도적영향．결과표명，괄당인입변계점능구제고모형정도，이원리측구3°—5°적균균변계점야능기도개선모형정도적작용．인차재실제건모시，응당재계산구역변계인입괄당적변계점，이개선지자모형적정도．
During the period of 2011 to 2012,Institute of Geophysics,China Earthquake Administration has partnered with Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences,and accomplished geomag-netic survey (total intensity F ,magnetic declination D ,magnetic inclination I ) of 119 stations in Mongolia.We calculate nine spherical cap harmonic models of geomagnetic anomaly field in Mongolia of 2010.0 epoch by using the accurate geomagnetic data of 119 stations and adding selected boundary point values of nine groups calculated by EMM2010 model respectively.And then we give the contour maps of north component ΔX ,east component ΔY and vertical compo-nent ΔZ ,by which the nine models are compared.Root mean square (RMS)error of the difference between geomagnetic survey values and calculated values at 119 survey stations is calculated to represent the accuracy of the nine models so as to evaluate quantitatively the influence of boundary points selection on the accuracy of the models.The RMS analysis results indicate that,besides appro-priate boundary points selection can improve model accuracy,the boundary points away from the measuring region 3°—5°can also improve model accuracy. Therefore,the appropriate boundary points should be introduced to improve accuracy of geomagnetic model in establishing model.