线性构造分数维值的含义

THE IMPLICATIONS OF THE FRACTAL DIMENSION VALUES OF LINEAMENTS

本文利用分数维理论按区域、小范围及单条线性构造分别求得了线性构造的分数维值,并与线性构造的结构特点、构造活动性、构造发育程度及地震活动特点进行了对比,认为线性构造的分数维值的大小反映了结构的复杂程度和构造活动性的强弱。具有不同分数维值的线性构造常处于不同的构造发育阶段,具有不同的地震活动特点和卫星影象特点。

In this paper the fractal dimension values of lineaments were obtained by means of the frequency-length statistics and analysed and compared with the texture complexity, activity, tectonic evolution and development, seismic characteristics and satellite image features. It is concluded that the magnitule of the fractal dimension values of lineaments reflects their texture complexity, their active intensity and the level of tectonic evolution and development. Different kinds of lineaments with different fractal dimension values usually correspond different seismicity and satellite image features. The younger the lineament, the larger the fractal dimension value, the much more complex of its texture and geometry, and the higher and stronger of its activty. The older the lineament, the smaller the fractal dimension value, the much simpler of its texture and geometry, and the weaker of its activity. During the developing process of a lineament from birth to death, many small secondary faults and ruptures tend to be connected, constituting relatively large faults, and the texture and geometry becomes simpler, and its activity undertaking a process from active and strong as well as frequent through weak to death. According to this opinion lineaments can be classified into different types with different tectonic activity and different complexity of texture and geometry, namely, the embryonic lineaments, the developing lineaments, the mature lineaments and decrepit lineaments, each corresponding different seismic characteristics.