变倾角磁异常化极方法  

The varying inclination method for magnetic reduction to the pole

作　　者：李勤[1] 李庆春[2] 景月红 

机构地区：[1]西安科技大学地质与环境学院,西安710054 [2]长安大学地质工程与测绘学院,西安710054 [3]东方地球物理公司国际部,天津300457

出　　处：《地球物理学进展》2014年第4期1497-1502,共6页Progress in Geophysics

基　　金：国家自然科学基金项目(41374145;41304105);高等学校博士学科点专项科研基金项目(20120205130002);陕西省教育厅专项科研计划项目(12JK0470)联合资助

摘　　要：磁异常化极是磁测资料处理和解释的重要基础,在大面积磁法测量及编图工作中,测区内磁纬度的变化范围很大,多个图幅资料只采用单一的磁倾角作化极处理显然是不合理的,必须考虑变磁倾角的处理方法.本文针对这一问题,改进常规的化极实现途径,尝试了在频率域进行大区域逐点变磁倾角实现化极的方案.理论模型和实际资料均表明,该方法在磁倾角变化范围很大的情况下,数值恢复精度比传统方法有较大提高,对目前大面积矿产资源磁法勘探资料连片处理具有实际意义.Reduction-to-the-pole（RTP）of magnetic anomalies has played a key role in the interpretation of magnetic anomalies.In large area magnetic survey and map compilation,magnetic latitude has great varying range,so it is unreasonable to do RTP with constant magnetic inclination.To solve this problem, we have tried a RTP strategy using varying inclination with respect to each observation station.The tests of synthetic model and processing of real data prove that the method preferred in this paper is better than the conventional ones in the areas with great varying range of magnetic inclination.The proposed method has practical significance to present mineral magnetic prospecting.

关 键 词：变倾角 磁异常 频率域 化极 

分 类 号：P631[天文地球—地质矿产勘探]