| 河西地区几次强震前的垂直地形变分维特征研究 |
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| 引用本文： | 张永志,王双绪.河西地区几次强震前的垂直地形变分维特征研究[J].内陆地震,1993,7(3):257-263. |
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| 作者姓名： | 张永志 王双绪 |
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| 作者单位： | 国家地震局第二地形变监测中心 西安
(张永志)，国家地震局第二地形变监测中心 西安(王双绪) |
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| 摘 要： | 采用关联维的计算方法,对河西地区门源6.4级和天祝一景泰6.2级地震过程中的垂直地形变序列的时、空分维数分别进行了计算,得到:本文研究区内远场(远离震中区)的地形变序列分维数在0.63～0.80之间,而近场(震中地区)的序列分维数在0.17～0.44之间,近场出现明显的降维现象;地震的孕、发过程中地形变观测序列分维数在0.22～0.37之间,而无震期间则在0.57～0.77之间,地震孕、发过程中地形变观测时间序列亦存在明显的降维现象。
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| 关 键 词： | 河西地区 地变形 分维 地震前兆 |
THE CHANGE OF FRACTAL DIMENSION IN VERTICAL DEFORMATION DURING SEVERAL STRONG EARTHQUAKES IN HEXI REGION |
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| Zhang Yongzhi Wang Shuangxu.THE CHANGE OF FRACTAL DIMENSION IN VERTICAL DEFORMATION DURING SEVERAL STRONG EARTHQUAKES IN HEXI REGION[J].Inland Earthquake,1993,7(3):257-263. |
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| Authors: | Zhang Yongzhi Wang Shuangxu |
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| Abstract: | In this paper,the fractal dimension of vertical deformation during Menyuan Ms 6. 4 earthquake and Tianzhu Ms 6. 2 earthquake which occurred in Hexi region is calculated. The conclusion and results are. 1. The value of fractal dimension of vertical deformation is from 0. 63 to 0. 80 in far -off epicentral region and from 0. 17 to 0. 44 in epicentral region during the two strong earthquakes. It is obvious that the fractal dimension of vertical deformation decreased in epicentral area during the earthquakes. 2. The value of fractal dimension before earthquakes is from 0. 22 to 0. 37 and after earthquakes is from 0. 57 to 0. 77 in epicentral area. It is obvious that the value of fractal dimension of vertical dimension decreased before earthquakes in epicentral region. |
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| Keywords: | Hexi region Vertical deformation Space fractal dimension Time fractal dimension Far -off epicentral region Epicentral region |
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