The original orientation ( i . e . the mol with respect to the geographical north ) of the core in the formation can be obtained by palaeomagnetic orientation tests . the two results are combined to define the direction of the maximum principle stress of the well or field 该方法根据差应变分析( dsa )实验确定地应力相对于岩心标志线的方向，利用古地磁方法确定岩心标志线相对于现代地理北极的方位，两者结合确定地应力方向。
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