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Shao Yongxin,Li Zhenhai,Chen Yukun,Ren Feng,Yao Zhengquan
Author NameAffiliation
Shao Yongxin Earthquake Administration of Tianjin Municipality,Tianjin 300201,China 
Li Zhenhai Earthquake Administration of Tianjin Municipality,Tianjin 300201,China 
Chen Yukun Earthquake Administration of Tianjin Municipality,Tianjin 300201,China 
Ren Feng Earthquake Administration of Tianjin Municipality,Tianjin 300201,China 
Yao Zhengquan State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS,Xi’an 710075,China 
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A Study on the Quaternary Activity of the Tianjin Fault
Shao Yongxin,Li Zhenhai,Chen Yukun,Ren Feng,Yao Zhengquan
Abstract:
The Tianjin fault includes South Tianjin fault and North Tianjin fault. Based on the results of artificial seismic exploration,four borehole profiles were laid out respectively west of Jinghai county town,Chaomidian village of Xiqing district,Xiaonanhe village of Xiqing district and Zhutoudian village of Ninghe county,to implement the exploration of these faults. Through identification of microfossils,the locations of marine beds in boreholes were obtained in this work,and through stratigraphic dating,the ages of the first,second and third marine beds were determined. Through strata correlation with the marine beds as key marker beds and integrating with the test results of paleo geomagnetism of boreholes BZ2 and TN3,the activity in the North and South Tianjin faults was analyzed and studied. The results indicate that there is no evidence of movement of the South Tianjin fault since the Late Pleistocene,but may have had weak activity before the Middle Pleistocene. No evidence of activity in the North Tianjin fault was found since the Late Pleistocene either,but might have been active in the early stage of the Early Pleistocene. These show that the activity of the South Tianjin fault is stronger than that of the North Tianjin fault. At the same time,we find that the second,third and fourth marine beds are lacking to some extent in different areas. So,before they are used in strata correlation, the age of marine beds must be determined,otherwise the results of strata correlation may lead to errors. For the second marine bed,where there has been dispute about its age,we consider the age to be about 70ka.
Key words:  Tianjin fault  Marine bed  Stratigraphic correlation  Fault activity