乌鲁木齐形变站2020年4月27日观测资料异常分析研究

ANOMALY ANALYSIS AND STUDY OF OBSERVATION DATA ON APRIL 27,2020 IN URUMQI DEFORMATION STATION

根据2020年4月27日乌鲁木齐形变站定点跨断层水准观测出现的NW测线和EW测线的大幅异常变化,采用对比复测的方法进行了异常核实和提取。通过对比观测排除了仪器和人员观测影响的因素,观测资料真实可靠,异常属实,从地质角度判断可能是W点受到某种干扰造成不稳定。为了论证造成乌鲁木齐形变站观测资料异常变化的原因,通过各方面的调查分析,认为此次异常变化是由于靠近观测场地附近地下水变化和场地南面的水塔山绿化灌溉用水量增加造成了W点的位移变化,而非地震前兆异常。

According to the significant abnormal changes of NW and EW survey lines in the fixed-point cross fault leveling observation of Urumqi deformation station on April 27,2020,the anomaly verification observation is carried out by using the method of comparative retest.The observation results are similar,excluding the factors affecting the observation of instruments and personnel.The observation data are reliable,and the anomaly do exist.Judging from the geological point of view,point W may be unstable due to some interference.In order to demonstrate the reasons for anomaly of Urumqi deformation station,through the investigation and analysis of various aspects,it is considered that the anomaly is due to the displacement change of point W caused by the change of groundwater near the observation site and the greening irrigation of Shuitashan in the south,rather than the precursory anomaly of earthquake.