论文部分内容阅读
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 the measured geomagnetic 3-component data in China in 2000, the Taylor field model and the fourth generation geomagnetic field integrated model - CM4 are respectively used to calculate and draw the normal field distribution. Since the distributions of the two normal fields are similar, for further comparison, we subtract the two normal field values from the measured values to obtain two kinds of magnetic anomalies, and use the Spline model to draw the magnetic anomaly maps of each component. The results show that: The distribution of the two kinds of anomaly maps is basically the same. The CM4 model is used as the normal field to combine with the geomagnetic distribution outside the national boundaries, which is suitable for the large-scale magnetic field research. The calculated magnetic anomaly distribution is dominated by the negative anomaly in China. The normal field is suitable for the magnetic field research in the local area, and the positive and negative distribution of the magnetic anomaly map obtained is more uniform and reasonable.