| 宁夏灵武、吴忠地区4次地震序列的时间分维特征 |
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| 引用本文： | 刁守中,蒋海昆,任庆维,李孟銮.宁夏灵武、吴忠地区4次地震序列的时间分维特征[J].西北地震学报,1990,12(2):42-48. |
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| 作者姓名： | 刁守中 蒋海昆 任庆维 李孟銮 |
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| 作者单位： | 山东地震局
(刁守中，蒋海昆)，宁夏地震局
(任庆维)，宁夏地震局(李孟銮) |
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| 摘 要： | 本文采用标度变换法分析了宁夏灵武、吴忠地区1971年以来发生的、有较完整的仪器记录的4次中强地震序列的时间分维D_0,发现前震序列或双震序列的第2次主震前的地震时间分维低于余震序列,序列的P值及b值亦具同步变化。初步认为,研究地震序列的时间分维结构可能有助于对其短期趋势的估计。本文还对有关问题进行了讨论。
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| 关 键 词： | 地震序列 时间 分维 |
| 收稿时间： | 1989/5/15 0:00:00 |
THE TIME FRACTAL CHARACTERISTICS OF FOUR EARTHQUAKE SEQUENCES OCCURRED IN LINGWU-WUZHONG AREA OF NINGXIA |
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| Diao Shouzhong,Jiang Haikun,Ren Qingwei and Li Mengluan.THE TIME FRACTAL CHARACTERISTICS OF FOUR EARTHQUAKE SEQUENCES OCCURRED IN LINGWU-WUZHONG AREA OF NINGXIA[J].Northwestern Seismological Journal,1990,12(2):42-48. |
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| Authors: | Diao Shouzhong Jiang Haikun Ren Qingwei and Li Mengluan |
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| Institution: | Seismological Bureau of Shandong Provihce, Jinan,Seismological Bureau of Shandong Provihce, Jinan,Seismological Bureau of Ningxia Hui Autonomous Region, Yinchuan and Seismological Bureau of Ningxia Hui Autonomous Region, Yinchuan |
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| Abstract: | In this paper, the time fractals (D) for four moderately strong earthquake sequences are analysed using box counting algorithm. The four sequences have taken place in Lingwu-Wuzhong area of Ningxia since 1971 and have been recorded accurately. The results show that the time fractals are low (D<0.5) in this area. For the double main shock sequence or foreshock sequence, the fractal obtained before the second main shock occurrence is lower than that obtained from aftershock sequence. We have also analysed the frequency attenuation features of four earthquake sequences. It shows that the attenuation coefficient P and b value have synchronous variation. Therefore, we think that the earthquake sequence time fractal may be helpful for judging earthquake tendency in a short period. |
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