[1]覃发超,史凯,张斌,等.芦山地震后初期余震时间序列的分形演化特征[J].山地学报,2013,(04):489.
　QIN Fachao,SHI Kai,ZHANG Bin,et al.Fractal Evolution of the Early Aftershock Sequence of Lushan Earthquake[J].Mountain Research,2013,(04):489.
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芦山地震后初期余震时间序列的分形演化特征()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2013年04期
页码:
489
栏目:
芦山地震
出版日期:
2013-01-01

文章信息/Info

Title:
Fractal Evolution of the Early Aftershock Sequence of Lushan Earthquake
作者:
覃发超;史凯;张斌;刘春琼;邓青春;罗明良;王磊;
1.西华师范大学国土资源学院，四川 南充 637009；
2. 吉首大学生物资源与环境科学学院，湖南 吉首 416000
Author(s):
QIN Fachao;  SHI Kai;  ZHANG Bin;  LIU Chunqiong;  DENG Qingchun;  LUO Mingliang; WANG Lei
1.School of Land and Resources, China West Normal University, Nanchong 637009, China;
2. School of Life and Environment, Jishou University, Jishou 416000, China
关键词:
芦山地震; 余震序列; 分形; 防灾减灾
Keywords:
Lushan Earthquake;  time series of aftershocks;  fractal dimension;  disaster prevention and reduction
分类号:
P64
文献标志码:
A
摘要:
2013-04-20四川芦山Ms7.0级强烈地震造成了极大的破坏,主震后发生了密集的余震,对其初期余震时间变化规律的认识有助于科学指导灾后重建和防灾减灾工作。根据国家地震科学数据共享中心的中国地震台网2013-04-20—05-06期间的余震时间序列数据,运用分形计盒维数的方法,研究不同震级阈值下余震序列的分形演化特征。结果表明,不同震级的芦山余震序列均表现出标度不变性和自相似特征,意味着对某震级阈值以上的余震来说,较小时间尺度内的数量与较高时间尺度内的余震数量具有相同的幂律分布规律,可以直接根据分形盒维数推算出未来某一时间尺度内高于某一震级阈值的余震的数量,这在高震级余震预测预报中有着重要的...
Abstract:
The strong earthquake of Ms7.0 grade in April 20, 2013 in Lushan, Sichuan Province, which caused great destruction, after the main shock occurred some dense aftershocks, understanding the time variation of early aftershock contributes to the scientific guidance for postdisaster reconstruction and disaster prevention and mitigation. This paper checked the time series data of aftershocks from April 20 to May 6th, 2013, according to the China Seismic Network unified earthquake catalog of National Earthquake Scientific Data Sharing Center, using the fractal box dimension method to study the fractal evolution characteristics of aftershock sequences in the different magnitude threshold. The results show that, Lushan aftershock sequence of different magnitudes have shown a characteristic of scale invariance and selfsimilarity, which means that, for aftershocks above the certain magnitude threshold, the number of aftershocks within the smaller time scale and the higher time scale has the same powerlaw distribution., according to fractal dimension, the number of aftershocks above a certain magnitude threshold within a future time scale can be calculated directly, which has an important practical significance in the prediction of high magnitude aftershock. The fractal box dimension of early aftershocks in Lushan with time evolution showed rapid attenuation trend, this characteristic has a significant difference from the Wenchuan aftershock sequence, which reflects the rapid energy release of Lushan earthquake, and the distribution of highmagnitude aftershocks on the time axis quickly become very sparse from the dense; since the Lushan earthquake energy release soon, undermining the selforganized critical condition, therefore, it’s not easy to accumulate aftershocks which induce highmagnitude aftershocks in the late aftershocks. However, due to the main shock and early intensive aftershocks caused instability of the mountain structure and loose the surface soil and rock, in this area of complex geological structure, mountainous terrain and the unique weather and climate conditions, the risk of secondary geological disasters will be greatly amplified, particular attention should be paid to the rainfallinduced geological disasters risk of intensive rainfall during July and August.

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备注/Memo

备注/Memo:
收稿日期(Received date)：2013-04-29；改回日期(Accepted)：2013-06-05。
基金项目(Foundation item)：国家自然科学
基金项目（41172321、41105118）、湖南省自然科学基金青年人才培养联合
基金项目（13JJB012）。［Supported by the Natural Science Foundation of China(Grant No.41172321 and 41105118), Joint Fund Projects of the Young Talents on the Natural Science Foundation of Hunan Province (Grant No.13JJB012).］
作者简介（Biography）：覃发超( 1979-)，男，湖北恩施人，讲师，博士生，现从事数量地理研究。［Qin Fachao (1979-), male, born in Hubei, lecture, doctoral candidate, major research in Quantitative Geomorphology.］E-mail: 32847828@qq.com *通信作者(Corresponding author)：史凯(1980-)，男，博士，副教授。［Shi Kai(1980- ), male, Ph D, assistant professor.］E-mail: einboplure@163.com
更新日期/Last Update: 1900-01-01