repeated levelling survey 重复水准测量
Repeated levelling surveys have been made at the seismic areas before and after the earthquake.
在该震区地震前后做了一些大地测量的复测工作。
The Quaternary tectonic stress states over the mentioned area and its relations to earthquakes are studied by combining the methods of geology, geomorphology. seismology and repeated levelling.
本文用地质、地貌、地震等综合方法研究第四纪构造应力状态。 本区第四纪主压应力为北东东—南西西方向。
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