福建漳州盆地岱山岩一珩坑北西向断裂带第四纪活动特征

Quaternary active feature of the north west fault zone at Daishanyan- Hengkeng in Zhangzhou basin, Fujian

通过对岱山岩一珩坑北西向断裂两侧第四纪地层的分布、构造地貌的发育等资料 的分析，着重研究了该断裂带第四纪的活动特征，并探讨了活动断裂与地震活动的关 系。研究结果表明：该断裂带是一条第四纪以来垂直正断兼具左旋水平走滑的活动断 裂，在时间上断裂活动具有多期性；在空间上断裂活动具有迁移性；并在断裂的延伸方 向存在差异活动而具有分段性。该断裂带第四纪以来宏观活动性和现今垂直形变活动性 明显，１４４５年在该断裂最具活动的地段发生６（１／４）级地震，表明该断裂现今仍在继续活动，今后仍有发生中强破坏性地震的可能。

By analyzing some data of the distribution of Quaternary stratum and the development of the structural physiognomy at both sides of the north west fault at Daishanyan - Hengkeng, we study Quaternary active feature of fault zone and discuss the relation of active feature and seismic activity. The results show as follows. 1 .The fault zone is active fault since Quaternary, and the fault is near vertical normal fault with left - strike slip. Its down side (west south plate) rises at a speed of 1.5mm/a, upper side drop at a speed of 0.4 - 0.6mm/a. Its speed of slip is 1.33 - 1.67mm/a. 2. It shows the characteristic of multi -period in time, migration in spatial and segment of activity along the fault. 3. Since Quaternary, the macroscopic activity and current vertical deformation are obvious. That an earthquake Ms6 (1/4) occurred at the best active section of the fault in 1445 indicates the fault is still active at present, and moderate earthquake will occur at this section.