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| 海洋磁力数据地磁日变时差校正的局部极值比对法 |
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刘 宾1, 王景强2,3, 张振波1, 周章国2, 宋德龙2, 付永涛2
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1.中海石油(中国)有限公司深圳分公司;2.中国科学院海洋研究所 海洋地质与环境重点实验室;3.国家海洋局第一海洋研究所
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| 摘要: |
| 为了对海洋磁力数据进行更精确合理的地磁日变校正, 参考多台站地磁观测数据时差计算的方法, 总结出一种适合于海洋磁力数据地磁日变时差校正的方法——局部极值比对法。利用局部极值比对法对南海北部两条海洋磁力测线进行地磁日变时差校正后, 海洋磁力数据与陆地地磁日变数据的相关系数分别提高到0.98 和0.92。通过与经度差法的比较, 证明局部极值比对法可以提高地磁日变时差计算的精确度和海洋磁力数据处理的效率。该方法为今后的海洋磁力调查工作提供了一种精确有效的工具。 |
| 关键词: 海洋磁力测量 陆地地磁日变 时差校正 局部极值比对法 |
| DOI：10.11759/hykx20140311002 |
| 分类号: |
| 基金项目:海洋战略先导专项(XDA1103010102) |
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| The local-extreme comparison on the time difference calculating for geomagnetic diurnal variation correction in marine magnetic data processing |
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| Abstract: |
| To correct marine magnetic data processing using the geomagnetic diurnal variation data, with time difference calculation methods between two or three geomagnetic diurnal variation stations, the local-extreme comparison was performed and summarized in this paper. This method was appropriate to the geomagnetic diurnal variation correction in marine magnetic data processing. By the local-extreme comparison, herein we corrected marine magnetic data with geomagnetic diurnal variation data. After the correction, the correlation coefficients between marine magnetic data and geomagnetic diurnal variation data increased to 0.98 and 0.92. Compared to the longitude difference calculation, the time difference obtained by local-extreme comparison can reflect the actual time difference between marine magnetic data and geomagnetic diurnal variation data. The local-extreme comparison can provide an actual and useful tool for the marine magnetic survey in the future. |
| Key words: marine magnetic survey geomagnetic diurnal variation time difference calculating local-extreme comparison |
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