摘要
本文以标度变换法、相关函数法、最小二乘法分别计算时间分维D_t、空间分维D_s、强度分维D_m(b值),系统清理了云南地区1976年以来6级以上强震前时空强分维的变化特征,表明强震前的降维现象是普遍存在的,但各次强震前的异常三要素又表现出复杂的多样性。结果还表明,强震前小震活动在时间分布上的明显不均匀性主要表现在强震孕育地区,而在空间分布上的明显不均匀性却主要表现在强震孕育的外围地区。
In this paper, the temporal fractal dimension Dt, spatial fractal dimension Ds and strength fractal dimension Dm (b value) have been calculated by the scale transformation, correlation function method, and least square method, respectively. The characteristic variations of fractal dimension of time, space and strength distribution before strong events(M>6.0) in Yunnan Area since 1976 have been systematically sorted out. The result indicates that, the phenomenon of fractal dimension drop is generally existed before strong events, but the anomalous three elements before each strong event have shown multi-complexity. The result also indicates that, the obvious temporal inhomogcneity of small event activities before a strong one mainly appears in the seismogenic area of the strong event, whereas the obvious spatial inho-mogeneity mainly appears in the surrounding areas of the seismogenic area.
出处
《地震研究》
CSCD
北大核心
1992年第1期21-28,共8页
Journal of Seismological Research
关键词
地震
时间分维
空间分维
强度分维
Scale transformation
Temporal fractal dimension
Spatial fractal dimension
Correlation function method
Least square method
Strength fractal dimension
