Ⅶ—Ⅸ度烈度区地震触发崩塌滑坡分布规律
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摘要
利用"4·20"芦山地震Ⅶ—Ⅸ度烈度区资料翔实的有利条件,研究不同烈度区地震触发崩塌滑坡的整体分布规律,并基于自组织临界状态理论,从物理角度对其机理进行诠释.实震资料表明:Ⅸ度、Ⅷ度、Ⅶ度烈度区,崩塌滑坡面积与发生频率之间的关系均可用幂律描述,且幂指数b值相近,但随地震烈度的降低,崩塌滑坡密度单调减小;元胞自动机模拟表明:当扰动强度按0.5的比率递减时,沙堆模型的动力学特性基本服从同一幂律分布,雪崩密度呈线性关系减小;振动台沙堆模型物理实验也支持了以上结论.说明规模与发生频率之间的幂律关系是Ⅶ—Ⅸ度烈度区地震触发崩塌滑坡的统一分布规律,灾害点密度的不同是体现它们震害强度差异的主要指标.结论可为地震触发山地灾害危险性区划、地震次生灾害风险评估等提供科学依据.
Based on the detailed data of "4·20"Lushan Earthquake from Ⅶ to Ⅸ seismic intensity zone,the distribution law of landslides triggered by earthquakes in different seismic intensity zones was explored. The mechanism is interpreted from a physical point of view. The field data shows that there exists a power-law relationship between the area and frequency of landslides inⅨ、Ⅷ、Ⅶ seismic intensity zones. Exponent b of the power-law in different zones is closed. But with the decline of the seismic intensity,the density of landslides decreases monotonically. The cellular automaton simulation reveals that the dynamical mechanism of sand-pile model is subject to the same power-law distribution,with 0. 5 decline ratio of disturbance intensity. The density of avalanche decreases linearly. Physics experiments with shaking table sandpile model also support above results. It is concluded that the power-law relationship between the scale and frequency is the basic regulation of landslides triggered by earthquakes from Ⅶ to Ⅸ seismic intensity zone. Different densities may serve as a major indicator of various intensities of damage. The research results may be used to provide scientific basis to sketch and assess the mountain disasters triggered by earthquake.
引文
[1]胡元鑫,刘新荣,蒋洋,等.非完整滑坡编目三参数反Gamma概率分布模型[J].中南大学学报(自然科学版),2011,42(10):3176-3181Hu Yuanxin,Liu Xinrong,Jiang Yang,et al.Three-parameter inverse-gamma probability distribution model of incomplete landslide inventory[J].Journal of Central South University(Science and Technology),2011,42(10):3176-3181
    [2]许冲.汶川地震滑坡详细编录及其与全球其他地震滑坡事件对比[J].科技导报,2012,30(25):18-26Xu Chong.Detailed inventory of landslides triggered by the 2008 Wenchuan earthquake and its comparison with other earthquake events in the world[J].Science&Technology Review,2012,30(25):18-26
    [3]王秀英,聂高众,张玲.汶川地震触发崩滑与Arias强度关系研究[J].应用基础与工程科学学报,2010,18(4):645-656Wang Xiuying,Nie Gaozhong,Zhang Ling.Relationship between landslides induced by the Wenchuan Earthquake and Arias intensity[J].Journal of Basic Science and Engineering,2010,18(4):645-656
    [4]常鸣,唐川,李为乐,等.“4·20”芦山7.0级地震地质灾害遥感快速解译与空间分析[J].成都理工大学学报(自然科学版),2013,40(3):275-281Chang Ming,Tang Chuan,Li Weile,et al.Image interpretation and spatial analysis of geohazards induced by“4·20”Lushan earthquake in epicenter area[J].Journal of Chengdu University of Technology(Science&Technology Edition),2013,40(3):275-281
    [5]崔鹏,陈晓清,张建强,等.“4·20”芦山7.0级地震次生山地灾害活动特征与趋势[J].山地学报,2013,31(3):257-265Cui Peng,Chen Xiaoqing,Zhang Jianqiang,et al.Activities and tendency of mountain hazards induced by the Ms7.0Lushan Earthquake,April 20,2013[J].Journal of Mountain Science,2013,31(3):257-265
    [6]黄艺丹,姚令侃,郭沉稳.基于元胞自动机的地震触发崩塌滑坡分布规律[J].西南交通大学学报,2013,48(4):609-615Huang Yidan,Yao Lingkan,Guo Chenwen.Distribution law of landslides triggered by earthquake based on cellular automata[J].Journal of Southwest Jiaotong University,2013,48(4):609-615
    [7]Bak P,Tang C,Wiesenfeld K.Self-organized criticality:An explanation of the 1/f noise[J].Physical Review Letters,1987,59(4):381-384
    [8]Held G A,Solinas D H.Experimental study of critical-mass fluctuations in an evolving sand-pile[J].Physical Review Letters,1990,65(9):1120-1123
    [9]Yao L K,Huang Y,Lu Y.Self-organized criticality and its application in the slope disasters under gravity[J].Science in China Series E:Technological Sciences,2003,46(S1):20-30
    [10]姚令侃,邱燕玲,魏永幸.青藏高原东缘进藏高等级道路面临的挑战[J].西南交通大学学报,2012,47(5):719-734Yao Lingkan,Qiu Yanling,Wei Yongxing.Challenges in construction of railway and highway from Sichuan to Tibet through eastern margin of Tibetan Plateau[J].Journal of Southwest Jiaotong University,2012,47(5):719-734
    [11]黄润秋,唐川,李勇等.汶川地震地质灾害研究[M].北京:科学出版社,2009Huang Runqiu,Tang Chuan,Li Yong,et al.Geohazard assessment of the Wenchuan Earthuqke[M].Beijing:Science Press,2009
    [12]Olami Z,Feder H,Jacob S,et al.Self-organized criticality in a continuous,nonconservative cellular automaton modeling earthquakes[J].Physical Review Letters,1992,68(8):1244-1247
    [13]姚令侃,黄艺丹,杨庆华.地震触发崩塌滑坡自组织临界性研究[J].四川大学学报(工程科学版),2010,42(5):33-43Yao Lingkan,Huang Yidan,Yang Qinghua.On the self-organized criticality of landslides triggered by earthquake[J].Journal of Sichuan University(Engineering Science Edition),2010,42(5):33-43
    [14]Gutenberg B,Richter C F.Frequency of earthquakes in Californial[J].Bull Seism Soc Amer,1944,34(4):185-188
    [15]Yao L K,Qi Y.Fractal characteristics of gravity landform and its SOC mechanism[J].Wuhan University Journal of Natural Sciences.2007,12(4):577-768

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