| 华北地区地震分布多标度分形特征的初步研究 |
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| 引用本文： | 蒋海昆,魏光兴.华北地区地震分布多标度分形特征的初步研究[J].西北地震学报,1993,15(1):61-66. |
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| 作者姓名： | 蒋海昆 魏光兴 |
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| 作者单位： | 山东省地震局
(蒋海昆),山东省地震局(魏光兴) |
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| 摘 要： | 依据“固定质量法”的定义及原理,本文给出了一种判断地震空间分布分形结构及计算D_q的方法。利用该方法对华北地区地震的空间分布特征进行了初步研究。结果表明,在满足一定的统计条件下,不同区域范围内、不同时间段的地震分布均具有分形结构。围绕海城、唐山大震区分别选择4个大小不同的区域,分不同时段计算其D_q—q谱。结果表明,强震前后其形态无显著变化。强震前在较大的区域范围内,D_o值有降低的趋势,震后回升;在震源区周围较小区域内,D_o的变化相反;而有的区域强震前后D_o值没有变化。
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| 关 键 词： | 华北 多标度分形 地震 分布 |
| 收稿时间： | 1991/4/10 0:00:00 |
A PRELIMINARY STUDY ON THE MULTI-FRACTAL OF EARTHQUAKE DISTRIBUTION IN NORTH CHINA |
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| Jiang Haikun and Wei Guangxing.A PRELIMINARY STUDY ON THE MULTI-FRACTAL OF EARTHQUAKE DISTRIBUTION IN NORTH CHINA[J].Northwestern Seismological Journal,1993,15(1):61-66. |
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| Authors: | Jiang Haikun and Wei Guangxing |
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| Institution: | Seismological Bureau of Shandong Province, Jinan, 250021 and Seismological Bureau of Shandong Province, Jinan, 250021 |
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| Abstract: | According to. the definition and,,principle of "fixed mass method", a numerical method is given in this paper, which can be used to judge, the earthquake space-distribution fractal and calculate its dimension. Using this method, the features of earthquake, distribution in North China is studied. The results. Show that satisfying certain statistic conditions, the earthquake distribution belongs fractal in different areas and periods. Selecting different areas and periods in the epicentral areas of the Tangshan and Haicheng earthquakes, the Dq-q spectra are calculated. The,results show that there is no marked change for the Dq versus q curves before and after the strong earthquakes. The results also show that for large areas, the D0 value has reducing trend before strong earthquakes, and increase after the events; it is opposite for small areas; and for some areas, the D0 seldom changes before and after strong events. |
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