Abstract: There is no reasonable explanation for the abnormal phenomenon of the annual cycle disappearance and change of trend of the short baseline since 2012 at the Tangshan station. The potential interference factors are verified to be the construction of large buildings near the observation site. To analysis quantitatively the influence of building construction on the phenomena, this paper is based on many years of cross-fault data and uses a finite element method of 2-d linear elastic model to simulate the fault movement. The results show that nearby large building construction do cause a decrease in the tendency of the fault tensional movement and the starting point matches the observation in time. But it can't cause reverse to be compression. At same time, it can decrease the annual amplitude of fault-cross short baseline but can't lead the year cycle to disappear. So it can be considered that these abnormal phenomena have higher reliability and are related to the regional tectonic movement and stress field change. That means the tectonic compressive movement may have be strengthened by 2012 in north China.

Key words: Cross-fault observation, Numerical simulation, Tangshan station