利用跨断层形变资料研究近期唐山断裂活动性

Researches on Activities of the Tangshan Fault with Cross-fault Deformation Data

采用1999年1月-2012年9月唐山台跨断层基线和水准数据资料，计算出唐山断裂水平和垂直形变及断层活动速率。并求解了唐山台站的应变特征和主应变方向，研究了唐山断裂的活动特征，并探讨了唐山断裂活动与地震活动的关系。结果表明，较远区域的大震和本地区中强地震对唐山断裂的水平向张压运动和垂向运动都可能有一定的影响。2003年可能是唐山断裂周边应力场发生较大改变的一年。

Using the data of cross-fault baseline and leveling recorded by Tangshan Stations from Jan. , 1999 to Sep. , 2012, the horizontal and vertical deformation and fault activity rate of Tangshan Fault are calculated. By solving the local strain characteristics and principal stress direction, the relationship between Tangshan Fault activities and seismic activities is discussed. The results show that large earthquake in remote field and local moderate strong earthquake may have a certain influence on the horizontal and vertical movement of the Tangshan Fault, and the stress field of the Tangshan Fault and its surrounding area may have great changed in 2003.