摘要
根据黄海及周边地区的布格重力资料 ,通过解析延拓、目标场提取、任意水平方向导数计算、离散小波变换等处理 ,得到各种有关断裂的信息 .经过与地质资料综合分析 ,选择1 2 3°E经线为典型剖面 ,以地震资料建立初始模型 ,对该剖面进行重力正反演迭代拟合 ,最终得到各模块的密度参数及分布 ,并在此基础上分析了研究区主要断裂的地质地球物理特征 ,给出了研究区的断裂带、块体结合带分布图 .重点对朝鲜半岛西缘断裂带和五莲—青岛—荣城断裂带进行了讨论 ,提出五莲—青岛—荣城断裂带并未进入朝鲜半岛与临津江断裂带相连 .认为朝鲜半岛西缘断裂带西侧属于扬子块体的部分曾受北向应力作用向北发生了平移 .由五莲—青岛—荣城断裂带和南黄海北部断裂带。
In light with Bouguer gravity data, various informations on faults were obtained by means of analytical continuation, target field extraction, arbitrary horizontal direction derivative processing and discrete wavelet transform processing. According to synthetic analyses with geologic data, the 123°E longitude was chosen as a typical profile, then initial models were established based on seismic data to perform gravational inverse iterative fitting, and finally density parameters of various modules and their distribution were given. Based upon which the geologic and geophysical properties of the principal faults of the study area were analysed, resulting in fault zone and block binding distribution maps. The paper focuses on the discussion of west marginal fault zone of the Korean Peninsula and Wulian-Qingdao-Rongcheng fault zone in the study area and points out that Wulian-Qingdao-Rongcheng fault zone did not intrude Korean Peninsula to connect with Imjinhang fault zone. It also holds that northward translational movement of the portion belonging to the Yangtze Plate at the west side of west marginal fault zone of the Korean Peninsula once occurred under the action of northward stress. Only the fault zones consisting of Wulian-Qingdao-Rongcheng fault zone along with northern fault zone of South Yellow Sea, west marginal fault zone of the Korean Peninsula, and south marginal fault zone of Cheju Island should be the binding site of Sino Korean and Yangtze Plates.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第3期385-397,T001-T003,T005,共17页
Chinese Journal of Geophysics
基金
国家自然科学基金项目 (4 0 0 71 1 75 )
国家基础研究 973项目 (G2 0 0 0 0 467-0 1 )
韩国KOSEF项目 (996-0 40 0 -0 0 5 -2 )
关键词
黄海
布格重力异常
断裂带
延伸
地球物理场特征
小波变换
大地构造
Yellow Sea Bouguer gravity anomaly, Fault zone, Extension, Geophysical field character, Wavelet transform, Geotectonics.
