摘要
据鲜水河断裂跨断层形变测量、流动重力测量和流动磁力测量资料 ,求取各点的形变速率、重力变化速率及每年各点的总磁场强度 ,绘出每期形变、重力、磁力的二维图像。引入分形理论的数盒子方法 ,计算每幅图的容量维。研究结果表明 :鲜水河断裂形变场的二维图像在地震前后的演变与岩石破坏实验过程输出的图像相似 ,均经历了“复杂—简单—复杂”的演化过程。相应的分维值也同样呈“高值—低值—高值”变化 ,且地震发生在分维值达最低后恢复过程中。重力场的二维图像在地震前后的变化特征为“简单—复杂” ,分维值呈低值向高值变化。磁场的图像变化则呈“复杂—简单” ,分维值变化呈降维特征。
Along Xianshuihe seismic faults, the measurements of deformation, gravity and magnetism are carried out By using these data, we calculate the deformation rate, gravity change rate and total intensity of magnetism field for each point and draw the two-dimension map with their data variations Furthermore, we adopt the method of counting box in fractal theory to calculate the volumetric dimension for each cell in the map We find that the deformation field evolution map of two-dimension picture of shows a changing procedure 'from complex to simple to complex again' before and after an earthquake which looks like that of rock break sample in test Same changing procedure 'from high to low to high again' appears for the fractal values For the analysis of gravity data, its changing procedure is 'from simple to complex' And for the magnetic data, it is 'from complex to simple' All fractal values decrease before and after an earthquake
出处
《四川地震》
2001年第3期11-16,共6页
Earthquake Research in Sichuan
关键词
形变测量
地壳形变图
重力场观测
磁场
鲜水河断裂
deformation measurement
abnormal analysis
deformation map of crust
gravity observation
