断裂性质与滑坡分布的关系——以汶川地震中的大型滑坡为例

doi:10.3969/j.issn.0253-4967.2014.02.007

摘要/Abstract

摘要： 越来越多的地震滑坡相对于地震断层的不对称分布震例让人们意识到断层上盘效应的存在。然而，目前有关断裂运动方式与滑坡空间分布关系的研究还不够充分和深入。在收集大量地震滑坡震例资料并获得其分布规律的基础上，建立了一个简化的断层模型，以地震波在地表与断层面之间反射传播特性为基础，探讨断层倾角改变对地表地震动强度的影响。进而，以汶川地震触发的大型滑坡为例，研究了断层的几何特征和运动方式对诱发滑坡空间分布的影响。结果表明，断层的倾角对滑坡空间分布范围具有控制作用，随着倾角的增加，垂直断层走向的滑坡分布范围逐渐减小；并且，大型滑坡的初始坡面受到断裂运动方向的影响，与断裂运动方向一致的坡面更容易发生滑坡。所获结果不仅有助于提高区域性地震滑坡危险区域的预测精度，而且对认识大型滑坡的滑动机制、主控因素以及可能的滑动规模、滑距等也起到促进作用。通过对滑坡崩塌的认识来辅助提高对地质构造、地震断层等的认识，应是地震诱发滑坡崩塌研究的新的意义所在。

关键词: 地震滑坡, 断层类型, 断裂倾角, 坡向, 运动方向

Abstract: More and more earthquake-triggered landslides show the hanging wall effects on the spatial distribution, however, the effects of seismic fault mechanics on landslides development are not clear at present time. Based on a simplified fault model, the knowledge of seismic waves reflecting between the ground surface and the fault plane is applied to explain the reasons why landslides are asymmetrically distributed on the hanging wall side during earthquakes caused by thrust faults. Moreover, this paper discusses the relationship between fault movement directions and the initial slope aspects based on the data of large landslides which occurred during the Wenchuan earthquake. This study shows that fault dip angle can affect landslides distribution, namely with the increasing of fault dip angle, the width of the region subjected to the landslides on the hanging wall side decreases. Also, the slopes whose aspects are in the similar directions as the initial movement direction of seismic fault are prone to failure. The knowledge obtained in this study will help to improve the accuracy in regional earthquake-triggered landslide susceptibility assessment and promote the research on the large landslides mechanism, major influencing factors as well as the possible landslide scales.

Key words: earthquake-triggered landslides, seismic fault type, fault dip angle, slope aspects, fault movement direction

中图分类号:

P315.9

陈晓利, 惠红军, 赵永红. 断裂性质与滑坡分布的关系——以汶川地震中的大型滑坡为例[J]. 地震地质, 2014, 36(2): 358-367.

CHEN Xiao-li, HUI Hong-jun, ZHAO Yong-hong. STUDY ON THE FAULT MECHANICS INFLUENCES ON THE LANDSLIDES DISTRIBUTION：A CASE STUDY FROM THE WENCHUAN EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(2): 358-367.

参考文献

陈晓利, 邓俭良, 冉洪流. 2011. 汶川地震滑坡崩塌空间分布特征研究［J］. 地震地质, 33(1): 191—202. doi: 10.3969/j.issn.0253-4967.2011.01.
CHEN Xiao-li, DENG Jian-liang, RAN Hong-liu. 2011. Analysis of landslides triggered by Wenchuan earthquake［J］. Seismology and Geology, 33(1): 191—202(in Chinese).
黄润秋, 李为乐. 2008. 5.12汶川大地震触发地质灾害的发育规律研究［J］. 岩石力学与工程学报, 27(12): 2585—2592.
HUANG Run-qiu, LI Wei-le. 2008. A study on the development and distribution rules of geohazards triggered by 5.12 Wenchuan earthquake［J］. Chinese Journal of Rock Mechanics and Engineering, 27(12): 2585—2592(in Chinese).
祁生文, 许强, 刘春玲, 等. 2009. 汶川地震极重灾区地质背景及次生斜坡灾害空间发育规律［J］. 工程地质学报, 17(1): 39—49.
QI Sheng-wen, XU Qiang, LIU Chun-ling, et al. 2009. Slope instabilities in the severest disaster areas of 5.12 Wenchuan earthquake［J］. Journal of Engineering Geology, 17(1): 39—49(in Chinese).
王运生, 罗永红, 吉峰, 等. 2008. 汶川大地震山地灾害发育的控制因素分析［J］. 工程地质学报, 16(6): 759—763.
WANG Yun-sheng, LUO Yong-hong, JI Feng, et al. 2008. Analysis of the controlling factors on geo-hazards in mountainous epicenter zones of the Wenchuan earthquake［J］. Journal of Engineering Geology, 16(6): 759—763(in Chinese).
王环玲, 徐卫亚. 2005. 高烈度区水电工程岩石高边坡三维地震动力响应分析［J］. 岩石力学与工程学报, 24(增2): 5890—5895.
WANG Huan-ling, XU Wei-ya. 2005. 3D dynamical response analysis of high rock slope related to hydropower project in high intensive seismic region［J］. Chinese Journal of Rock Mechanics and Engineering, 24(Suppl 2): 5890—5895(in Chinese).
吴树仁, 王涛, 石玲, 等. 2010. 2008汶川大地震极端滑坡事件初步研究［J］. 工程地质学报, 18(2): 145—159.
WU Shu-ren, WANG Tao, SHI Ling, et al. 2010. Study on catastrophic landslides triggered by 2008 great Wenchuan earthquake, Sichuan, China［J］. Journal of Engineering Geology, 18(2): 145—159(in Chinese).
许强, 李为乐. 2010. 汶川地震诱发大型滑坡分布规律研究［J］. 工程地质学报, 18(6): 818—826.
XU Qiang, LI Wei-le. 2010. Distribution of large scale landslides induced by the Wenchuan earthquake［J］. Journal of Engineering Geology, 18(6): 818—826(in Chinese).
徐锡伟, 闻学泽, 叶建青, 等. 2008. 汶川M_S8.0地震地表破裂带及其发震构造［J］. 地震地质, 30(3): 597—629.
XU Xi-wei, WEN Xue-ze, YE Jian-qing, et al. 2008. The M_S8.0 Wenchuan earthquake surface ruptures and its seismogenic structure［J］. Seismology and Geology, 30(3): 597—629(in Chinese).
殷跃平. 2008. 汶川8级地震地质灾害研究［J］. 工程地质学报, 16(4): 433—444.
YIN Yue-ping. 2008. Research on the geo-hazards triggered by Wenchuan earthquake, Sichuan［J］. Journal of Engineering Geology, 16(4): 433—444(in Chinese).
张冬丽, 周正华, 陶夏新. 2009. 震源破裂方式和断层性质对近场强地震动特征的影响［J］. 西北地震学报, 31(4): 311—318.
ZHANG Dong-li, ZHOU Zheng-hua, TAO Xia-xin. 2009. Influence of seismic source mechanism and fault property on near-field strong ground motion［J］. Northwestern Seismological Journal, 31(4): 311—318(in Chinese).
张培震, 闻学泽, 徐锡伟, 等. 2009. 2008年汶川8.0级特大地震孕育和发生的多单元组合模式［J］. 科学通报, 54(7): 944—953.
ZHANG Pei-zhen, WEN Xue-ze, XU Xi-wei, et al. 2009. Tectonic model of the great Wenchuan earthquake of May 12, 2008, Sichuan, China［J］. Chinese Sci Bull, 54(7): 944—953(in Chinese).
朱艾斓, 徐锡伟, 刁桂苓, 等. 2008. 汶川M_S8.0地震部分余震重新定位及地震构造初步分析［J］. 地震地质, 30(3): 759—767.
ZHU Ai-lan, XU Xi-wei, DIAO Gui-ling, et al. 2008. Relocation of the M_S8.0 Wenchuan earthquake sequence in part: Preliminary seismotectonic analysis［J］. Seismology and Geology, 30(3): 759—767(in Chinese).
Abrahamson N, Somerville P. 1996. Effects of the hanging wall and footwall on ground motions recorded during the Northridge earthquake［J］. Bulletin of the Seismological Society of America, 86: 93—99.
Chen Xiao-li, Zhou Qing, Ran Hong-liu, et al. 2012. Earthquake-triggered landslides in southwest China［J］. Nat Hazards Earth Syst Sci, 12: 351—363.

Chen X L, Ran H L, Yang W T. 2012. Evaluation of factors controlling large earthquake-induced landslides by the Wenchuan earthquake［J］. Nat Hazards Earth Syst Sci, 12:3645—3657.

Dai F C, Xu C, Yao X, et al. 2011. Spatial distribution of landslides triggered by the 2008 M_S8.0 Wenchuan earthquake, China［J］. Journal of Asian Earth Sciences, 40:883—895.

Harp E L, Jibson R W. 1996. Landslides triggered by the 1994 Northridge, California, earthquake［J］. Bulletin of the Seismological Society of America, 86(1B):s319—s332.
Keefer D K. 1984. Landslides caused by earthquake［J］. Geological Society of America Bulletin, 95: 406—421.

Khazai B, Sitar N. 2003. Evaluation of factors controlling earthquake-induced landslides caused by Chi-Chi earthquake and comparison with the Northridge and Loma Prieta events［J］. Engineering Geology, 71: 79—95.

Meunier P, Hovius N, Haines J A. 2007. Regional patterns of earthquake-triggered landslides and their relation to ground motion［J］. Geophys Res Lett, 34:L20408. doi: 10.1029/2007GL031337.
Jibson R W, Harp E L. 1994. Landslides triggered by the Northridge earthquake［J］. Earthquake & Volcanoes, 5: 1—41.
Jibson R W, Harp E L, Schulz W, et al. 2006. Large rock avalanches triggered by the M 7.9 Denali Fault, Alaska, earthquake of 3 November 2002［J］. Engineering Geology, 83: 144—160.

Oglesby D D, Archuleta R J, Nielsen S T. 2000. The three-dimensional dynamics of dipping faults［J］. Bulletin of the Seismological Society of America, 90(3): 616—628.

Oglesby D D, Day S M. 2001. Fault geometry and the dynamics of the 1999 Chi-Chi(Taiwan)earthquake［J］. Bulletin of the Seismological Society of America, 91(5): 1099—1111.

Qi Sheng-wen, Xu Qiang, Lan Heng-xing, et al. 2010. Spatial distribution analysis of landslides triggered by 2008.5.12 Wenchuan earthquake, China［J］. Engineering Geology, 116: 95—108.

Qi SW, Xu Q, Zhang B, et al. 2011. Source characteristics of long runout rock avalanches triggered by the 2008 Wenchuan earthquake, China［J］. Journal of Asian Earth Sciences, 40: 896—906.

Shen Z K, Sun J P, Zhang Z, et al. 2009. Slip maxima at fault junctions and rupturing of barriers during the 2008 Wenchuan earthquake［J］. Nature Geoscience, Online Publication: 27 Sep. 2009. doi: 10.1038/ngeo636.
Wang H B, Sassa K, Xu W Y. 2007. Analysis of a spatial distribution of landslides triggered by the 2004 Chuetsu earthquakes of Niigata Prefecture, Japan［J］. Nat Hazards, 41: 43—60.

Wang W N, Wu H L, Nakamura H, et al. 2003. Mass movements caused by recent tectonic activity: The 1999 Chi-Chi earthquake in central Taiwan［J］. The Island Arc, 12: 325—334.

Xu C, Xu X W, Yao Q, et al. 2013. GIS-based bivariate statistical modeling for earthquake-triggered landslides susceptibility mapping related to the 2008 Wenchuan earthquake, China［J］. Quarterly Journal of Engineering Geology and Hydrogeology. doi: 10.1144/qjegh2012—006.
Yu G, Xu X, Klinger Y, et al. 2010. Fault-scarp features and cascading-rupture model for the M_W 7.9 Wenchuan earthquake, eastern Tibetan plateau, China［J］. Bulletin of the Seismological Society of America, 100: 2590—2614.

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