山西霍山山前断裂的水平运动研究

The Study about the Horizontal Motion of the Piedment Fault of Mt.Huosha

霍山山前断裂是山西临汾盆地北半部主要边界断裂。作者通过对断裂带两侧的基岩、上新世砾石层的水平错位及断裂盆地东侧的地貌形态的分析研究，发现自上新世以来，霍山山前断裂曾发生过１２．５ｋｍ的右旋水平活动。其活动平均速率为２．５ｍｍ／ｙｒ，而垂直运动平均速率只有０，５ｍｍ／ｙｒ，反映了临汾盆地的新构造活动以水平剪切为主，并进一步提也临汾盆地是一地震高烈度区。

The piedmont fault of Mt. Huoshan is an important boundary one on the east-ernorth of Linfen Basin. The author discoves this fault has experienced a dextral dis-placement of 12. 5km since the pliocene epoch by studying not only the offset of rocksand gravels(N_2)on two sides of the fault, but the morphotecnic features on the west-side of the fauIt. The mean rate of horizontal slip of this fault is 2. 5mm per year,andthat of vertical slip is 0. 5mm per year, which indicates the neotctonic movement is pri-marily composed of shearslides. At last, the author, according to the former investiga-tion and the the development of the pluvial fans on the western piedmont of Huoshan,puts forward that Linfen Basin is a regin with high seismic intensity.