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江西地处长江中下游,横跨扬子地块和华南造山带,多次强烈的区域地质活动使其成为我国多金属、稀有金属的矿产基地之一,江西区域地质具有重要研究意义.地震层析成像是认识深部和区域构造的一种重要的手段.搜集了区域地质构造资料,建立了江西地区上地壳速度结构初始模型.筛选了江西地震台网监测的江西及邻区的634次地震事件,利用阻尼最小二乘法,对江西地区上地壳三维速度结构进行了成像,发现:广丰-萍乡断裂中部区域为全江西最低速度;九江至修水一带造山带具有低速特征,且呈条状;赣州至寻乌一带,也有大范围低速特征;高速区主要处于鄱阳湖至南昌盆地区域.
Jiangxi is located in the middle and lower reaches of the Yangtze River, across the Yangtze block and the South China orogenic belt, a number of strong regional geological activities make it one of China’s polymetallic and rare metals mineral base, Jiangxi regional geology has important research significance. Imaging is an important means to understand deep structure and regional structure.It collected regional geologic structure data and built an initial model of upper crustal velocity structure in Jiangxi Province.Screening 634 earthquakes in Jiangxi and its neighboring areas monitored by Jiangxi Seismic Network, The damped least squares method was used to image the three-dimensional velocity structure of the upper crust in Jiangxi Province. It was found that the central part of the Guangfeng-Pingxiang fault was the lowest in Jiangxi Province, and the orogenic belt in the Jiujiang-Xiujiang region belonged to low velocity. To Xunwu area, there are a wide range of low-speed features; high-speed area is mainly in the Poyang Lake to Nanchang basin area.