DOES “YANGTZE FAULT ZONE”EXIST ALONG THE YANGTZE VALLEY BENEATH THE ZHENJIANG AREA?
Li Qitong, Nan Jinshen, He Dongpei, and Guo Jiangning(Jiangsu Seismological Bureau)
Some debets, about some structures in the Yangtze valley to the east of the Zhe-njiang area, have been often focused on these two problems: 1) does"Yangtze fault zone" exist along the Yangtze valley? and 2) is it a contemporary continental rift valley? By means of field investigations of the tectonics of the lower Yangtze valley and research of various materials, the authors have concluded the scarps along the Yangtze banks beneath the Zhenjiang area are not real and the large faults do not go through Yangtze valley, instead of being a syncline in the Yangtze valley along the Jiangyin-Shazhou-Jingjiang area. Besides, the physiographic history of the Yangtze delta and characteristics of the geophysical fields, especially gravity field and the characterristics of volcanic and seismic activities, all illustrate that "Yangtze fault zone" does not exist along Yangtze valley beneath the Zhenjiang area nor the contemporary continental rift valley.