摘要
基于2000年中国地区的实测地磁3分量数据,分别选用Taylor模型和第四代地磁场综合模型——CM4计算并绘制出正常场分布图。由于2种正常场分布较为相似,为了进一步比较研究,分别将实测值减去2种正常场模型值以得到2种磁异常值,并利用曲面Spline模型绘制各地磁分量磁异常图,结果显示:2种异常图分布基本一致,以CM4模型作为正常场与国界外的地磁分布结合得较好,适合进行大尺度的磁场研究,计算的磁异常分布在国内以负异常为主;以Taylor模型作为正常场适合进行局部区域的磁场研究,获得的磁异常图正负分布较为均匀、合理。
Based on three components survey data of China in 2000,two kinds of normal field,main field model of CM4 and Taylor polynomial model,were chosen to calculate and draw the distribution plots of normal field. Due to the high similarity between the two kinds of normal field and in order to make more precise comparative analysis of them,two kinds of anomaly values were correspondingly calculated by using the two models. Moreover,the Surface Spline model was selected to draw anomaly plots of each component. Results showed that the distribution of the two kinds of the normal field is very similar. The normal field made by CM4 has a good coincidence with the distribution outside the boundary,which is suit for the study of the geomagnetic anomaly on large scale. Nevertheless,the negative values dominate in most regions of China; On the contrary,the normal field made by Taylor model is suit for the study of the regional geomagnetic anomaly,the distribution of positive and negative values is comparatively uniform and reasonable in the mainland.
出处
《地球科学进展》
CAS
CSCD
北大核心
2010年第7期723-729,共7页
Advances in Earth Science
基金
国家高技术研究发展计划课题研究专项"室内水下地磁定位导航技术研究"(编号:2007AA12Z328)资助
