低纬度磁异常化极方法应用效果对比  被引量:16

Comparison of the application effects of the reduction-to-the-pole methods at low magnetic latitudes

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作  者:彭利丽[1] 郝天珧[1] 姚长利[2] 徐亚[1] 赵百民[3] 

机构地区:[1]中国科学院地质与地球物理研究所,中国科学院油气资源研究重点实验室,北京100029 [2]中国地质大学北京,北京100083 [3]中国国土资源航空物探遥感中心,北京100083

出  处:《地球物理学进展》2010年第1期151-161,共11页Progress in Geophysics

基  金:国家“973”计划(2007CB411701);“863”计划(2006AA09A101-0201);国家自然科学基金项目(40804016)联合资助

摘  要:低纬度磁异常化极的方法很多,包括在空间域化极和在频率域化极,比较起来,频率域方法计算简单快速,目前化极主要在频率域进行.然而大部分低纬度化极方法只压制了噪声并没有针对化极因子做改动,也就没有真正达到压制南北向条带状拉长的目的.本文针对其中4种在频率域对化极因子做处理的方法(双曲正弦法,压制因子法,直接阻尼法,伪倾角法),设计模型进行对比,并用南海某地区的实测数据进行4种方法的化极效果对比,选出一种最符合南海地区实际情况的化极方法.并对原有的直接阻尼法和伪倾角法做了适当的改进.There are many methods of reduction to the pole at low magnetic latitudes (RTP-L), including time domain and wavenumber domain. Comparatively, the latter is easy and rapid, so currently the RTP is done mainly in wavenumber domain. However, most of the RTP-L methods can just suppress noise instead of eliminating noise because they don't change the RTP operator itself. Most importantly, all methods suppress the power amplification caused by noise in and near the direction of the magnetic declination, at a cost of stretching the true anomalies in the direction perpendicular to the declination. In order to select the most appropriate method for the actual situation at the South China Sea, this paper designed models and used data from some region in the South China Sea to compare four RTP-L methods (the hyperbolic sine method, the suppression RTP filter method, the direct damping method and the pseudo-inclination method) in the wavenumber domain which change the RTP operator. And also some improvements were made for the direct damping method and the pseudo-inclination method.

关 键 词:低纬度化极 双曲正弦法 压制因子法 直接阻尼法 伪倾角法 

分 类 号:P318[天文地球—固体地球物理学]

 

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