摘要
在安装地震仪器时,方位精度要求到6′,而在许多台站的摆房里预先没有划好方位线,故不得不借助罗盘定向,且必须用磁偏角修正。阐述了磁偏角的变化,提出了计算磁偏角的方法,推出了实用的计算公式。
Orientation, the accuracy should be 6＇, for the seismic instruments is important. Because there is no orientation line in many seismic stations, people has to use the compass to find the earth＇ s north orientation and use the magnetic declination to correct the result. This paper describes the change of the magnetic declination and the method and the formation for calculating magnetic declination are presented as well.
出处
《大地测量与地球动力学》
CSCD
北大核心
2006年第2期120-123,共4页
Journal of Geodesy and Geodynamics
基金
国家数字地震台网研究项目
关键词
地震仪器定向
磁偏角
罗盘
磁北极
地理北极
seismic instrument orientation, magnetic declination, compass, magnetic north pole, geographical north pole
