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用多道维纳滤波方法处理了唐山地震前后十年左右的墙子路、小水峪基线测量资料。观测资料存在明显的年周期变化。处理结果表明,资料的年变化主要与温度影响有关,降雨因素亦对基线测量资料略有影响。墙子路垂直基线测量资料在基本消除年变化影响后表明,震前四年左右存在明显下降变化,震后五年多资料趋于平稳。斜交基线测量资料则在1974年上半年出现明显下降变化,而在1975年底出现反向变化。墙子路基线测量资料在震前的变化幅度约为(2～3)×10~(-5)。小水峪资料震前约三年左右曲线缓慢上升,震后基本上趋于稳定。变化幅度约为(1～2)×10~(-5)。经过处理后的基线测量资料表明,断层在唐山地震前存在明显的水平方向运动。
Multi-channel Wiener filtering method was used to process the baseline data of Qianzilu and Xiaushuanyu ten years before and after the Tangshan earthquake. The observed data have obvious annual cycle changes. The treatment results show that the annual variation of the data is mainly related to the temperature influence, and the rainfall factor also slightly affects the baseline measurement data. The vertical baseline measurement data of the wall road show that the annual change has basically eliminated the influence of annual change before and after the earthquake, and there is a marked decrease in the data about four years before the earthquake. The data stabilized more than five years after the earthquake. Oblique baseline measurements were significantly reduced in the first half of 1974, but reversed at the end of 1975. The variation of baseline data of wall road before earthquake is about (2 ~ 3) × 10 ~ (-5). Before the earthquake, the curve of Xiao Shui Yu slowly rose about three years after the earthquake and basically stabilized after the earthquake. The variation range is about (1 ~ 2) × 10 ~ (-5). After processing the baseline measurement data show that there is a clear horizontal movement of the fault before the Tangshan earthquake.