利用重力资料探讨冲绳海槽海底断裂构造

根据小比例尺重力资料直接研究海底断裂构造困难较大。本文用频谱分析、平滑滤波、解析延拓、水平求导、相关分析、莫霍面计算等方法对重力资料进行处理分析,结果表明,冲绳海槽发育了北西和北北东向两组断裂构造,构成了断裂体系。

APPROACHING THE SUBMARINE FAULTS OF THE OKINAWA TROUGH ON THE BASIS OF GRAVITY DATA

Up to now, geologists usually apply the costly seismic reflection to approach the submarine fault structures. Few have used the available gravity data to study submarine fault. Theis paper discusses various ways to the study of Okinawa Trough. The results of calculation and analyses show: 1, After frequency spectrum analysis, methods such as smooth filter, analytic extension, horizontal derivative, correlative analyses, Moho calculating and so on, are very useful for studying large submarine fault. 2. Crustal activity is very strong in the Okinawa trough, developing into two groups of fault with NNE and NW strikes in a fractural system, and forming a main structural frame that controls the tectonic evolution of this neo-spread back arc basin.