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第二种测定法是古磁学分析法， 也叫磁极地层学测定法。
The second dating method was palaeo - magnetic analysis, or magnetic polarity stratigraphy .
在翻转期间，磁场保持它的双极子外形，保留了古磁学家一直能够追踪南极踪迹的现象。
And during the transition, the field retains its dipole shape, a phenomenon paleomagnetists have traced all the way to the south pole.
六个教员，四个博士后研究人员和研究生从事于区域内全球地震学、反射地震学、动力学、大地测量学、古磁学。
Six faculty members, four postdoctoral researchers, and graduate students work in the areas of global seismology, reflection seismology, geodynamics, geodesy, and paleomagnetism.
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