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本文首先给出了北京地区若干跨断层位移测量结果的年周期变化.而后,用二维非线性有限元方法,模拟了温度变化引起的跨断层位移测量结果的年周期变化.计算得到的应变量与野外观测大体一致.结果表明,在地壳介质不均一条件下,地表温度变化足以引起已观测到的种种复杂现象,诸如:存在两类基线,一类是当地表温度升高时增长;另一类是当地表温度升高时缩短.同时,存在两类水准变化,一类是断层热胀系数大的一盘,当地表温度上升时抬升;另一类则相反等等.一般说来,地壳介质是不均一的,因而温度对跨断层位移测量的干扰是不容忽视的.
In this paper, the annual cycle variations of some cross-fault displacement measurements in Beijing area are given first, and then the annual variation of cross-fault displacement measurement results caused by temperature changes is simulated by two-dimensional nonlinear finite element method.The calculated strain The results show that under the condition of uneven crustal medium, the change of surface temperature is enough to cause the observed complex phenomena, such as two types of baseline, one is the increase when the local surface temperature increases and the other one The class is shortened when the local surface temperature rises, and there are two kinds of level changes, one is a plate with a large thermal expansion coefficient of the fault, raised when the local surface temperature rises, and the other is the opposite, etc. In general, the crust The medium is non-uniform, and therefore the interference of temperature on cross-fault displacement measurements can not be ignored.