差分GPS方法在城市活断层探测中的应用探讨

使用差分GPS方法, 测量西宁盆地内部各级阶地参数, 对比野外阶地特征, 探讨区域新构造时期活动特征, 以及西宁城市周缘活断层的分布及活动特征。 通过这一区域的实践, 认为DGPS方法能够快速、 精确的获得区域内阶地面的坐标和高程, 是确定弱活动或隐伏断裂的可行方法。 南川河断裂错断T₃、 T₄、 T₅阶地, 断裂的活动时间为T₃阶地形成后, T₂级阶地形成前的0.10 Ma B.P.至0.05 Ma B.P.。 垂直断距15～20 m, 最小垂直活动速率约为0.30 mm/a。

Use of differential GPS in detecting active faults in cities

By using the method of differential GPS,on the basis of observing the features of the terraces in Huangshui basin,we have surveyed the parameters of the terraces in Huangshui basin,and primarily ascertained the characteristics of neo-tectonics in this region,and also found out the distribution and movement features of the active faults around Xining City.Through the research described above, we draw a conclusion as follows: by using the DGPS,the coordinate and elevation of the terraces can be quickly and accurately acquired;so the DGPS is a feasible way to find the positions and other features of weak active or concealed faults.T3,T4,T5 terraces is dislocated by Nan chuan river fault between 0.10 Ma B.P.and 0.05 Ma B.P.with the least velocity of 0.15 mm/a.