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在讨论地应力的空间分布、时间变化时,相当高的精度是非常必要的。8元件应力计法是伴随应力释放的孔底面上应变量的测定法之一,3维应力的6个分向,就是根据最小二乘法,利用回归模式估算的应变量。回归模式的误差,是使估算应力产生的误差。根据这次从理论和实际两方面对回归模式进行重新研究的结果,在估算的应力值中,包含有在讨论地球物理学时成为问题的误差。另外,如果对这些误差进行修正,就可以从以往的测定值中得到置信度更高的应力估算值。
In discussing the spatial distribution of geostress and the time variation, a very high degree of accuracy is necessary. The 8-element stress meter method is one of the methods for determining the amount of strain on the bottom of a hole with stress relief. The 6-direction stress in 3-dimensional stress is the amount of strain estimated by regression mode according to the least square method. The error of the regression model is to make the error of estimating the stress. According to this re-study of the regression model both theoretically and practically, the estimated stress values include errors that have been a problem in the discussion of geophysics. In addition, if these errors are corrected, a more confident estimate of stress can be obtained from past measurements.