A Study on the Quaternary Activity of the Tianjin Fault

A Study on the Quaternary Activity of the Tianjin

Fault

Shao Yongxin;Li Zhenhai;Chen Yukun;Ren Feng;Yao Zhengquan

【期刊名称】《中国地震研究（英文版）》 【年(卷),期】2010(024)003

【摘要】The Tianjin fault includes South Tianjin fault and North Tianjin fault.Based on the results of artiffcial seismic exploration,fonr 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 fanit 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