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钻孔应变仪直接观测的是筒壁的直径变化,并不是地壳应变.在进行潮汐分析时必须首先将观测值转换为应变值.基于2008年1月1日至2013年4月19日全国部分钻孔应变观测资料,选取应变差分值进行计算.我们首先对观测数据进行相对标定、绝对标定,反演得到地理坐标系下观测点的应变分量.采用球状径向不均匀弹性地球模型计算理论应变固体潮.最终运用调和分析方法,得到面应变固体潮的M2波潮汐振幅因子.分析潮汐因子变化特征以及影响潮汐因子动态变化的因素,发现观测点的纬度和高程对潮汐因子的影响可以忽略,而围岩的性质对潮汐因子影响明显.
The borehole strain gauge directly observes the change in the diameter of the cylinder wall and is not the crustal strain. The tidal analysis must first be converted to strain values. Based on the National Sections from January 1, 2008 to April 19, 2013 Borehole strain observation data, select the strain difference value for calculation.We first relative measurement of the observed data, absolute calibration, inversion of the geostationary coordinate system at the observed point of the strain component.Using spherical radial uneven elastic earth model to calculate the theoretical strain Finally, the M2 wave tidal amplitude factor of surface strain solid tide is obtained by harmonic analysis.Analysis of the characteristics of tidal factor changes and the factors that affect the dynamic changes of tidal factors, we find that the impact of latitude and elevation on the tidal factor can be neglected, The nature of the surrounding rock has a significant impact on the tidal factor.