华北与东南沿海地区岩石介质差异性研究

Studies on the difference of rock medium properties in north China and southeast China coastal areas.

通过地震活动性特征研究了华北与东南沿海地区岩石介质差异性 ,以唐山、海城及福建地区为例 ,计算了上述地区的视应力降和环境应力背景值 ,并用分形理论中的标度揭示了这种差异性的定量特征。结果表明 ,在华北地区 (唐山与海城 ) ,环境应力值有强烈的涨落 ,而东南沿海地区 (福建 )其涨落并不明显 ,从而揭示了华北与东南沿海地区地壳岩石介质的差异性。这意味着上述地区的动力学特征在板块构造力作用下存在明显的差异。最后 。

The differences, in this paper, of the rock medium properties in north China and southeast China coastal areas are studied by seismicity method. The apparent stress drop and ambient stress values of seismic activities in areas mentioned above are also calculated. The quantitative characteristics for their differences are described by using fractal theory. The results showed that the ambient stress values obviously experiense fluctuations in north China (Haicheng of Tangshang) areas, but does not change obviously in southeast China coastal (Fujian) areas. It reveals that the rock medium features are different between the north China and southeast China coastal areas. And it means that the dynamic characteristics under the control by the plate structure in areas mentioned above are different, especially, the rock properties of the thin crust possibly depend on the depth. Finally, the complexity of variation in three areas is discussed based on the point of dynamic view. In the meantime, problems possibly existing are also discussed.