CAJ | 학술논문

低纬度磁异常化板的方法很多,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.
저위도자이상화판적방법흔다,포괄재공간역화겁화재빈솔역화겁,비교기래,빈솔역방법계산간단쾌속,목전화겁주요재빈솔역진행.연이대부분저위도화겁방법지압제료조성병몰유침대화겁인자주개동,야취몰유진정체도압제남북향조대상랍장적목적.본문침대기중4충재빈솔역대화겁인자주처리적방법(쌍곡정현법,압제인자법,직접조니법,위경각법),설계모형진행대비,병용남해모지구적실측수거진행4충방법적화겁효과대비,선출일충최부합남해지구실제정황적화겁방법.병대원유적직접조니법화위경각법주료괄당적개진.
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.