Landslides induced by the 2010 Chile megathrust earthquake: a comprehensive inventory and correlations with geological and seismic factors
Landslides induced by the 2010 Chile megathrust earthquake: a comprehensive inventory and correlations with geological and seismic factors
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DOI：
10.1007/s10346-019-01150-6
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发表时间：
2019-06-01
期刊：
影响因子：
6.7
通讯作者：
Murphy, William
中科院分区：
文献类型：
--
作者：
Serey, Alejandra;Pinero-Feliciangeli, Laura;Murphy, William
2010年马乌莱8.8级地震发生在纳斯卡和智利海岸外南美构造板块之间的俯冲接触区，是一个重要的机会，可以更好地了解俯冲带大型逆冲断层地震引发的滑坡的分布和控制。本文提供了对马乌莱32.5度和38.5度之间地震的综合滑坡清单的分析。总共绘制了1226个滑坡，总面积为c。120，500 km（2），主要为破坏性滑坡。滑坡总体积为c。10.6毫米（3）。这些事件在研究区域分布不均匀，大多数滑坡位于安第斯山脉和阿劳科半岛海岸附近的一个非常有限的区域，形成滑坡群。数据库的统计分析表明，地形和岩性是控制同震滑坡的主要地质因素，而与滑坡发生相关性较高的地震因素是地面水平加速度峰值与垂直加速度峰值之比。结果和其他地方的地震事件的比较表明，由巨型逆冲断层地震所产生的滑坡的数量比由浅地壳地震所触发的事件至少低一个或两个数量级，这是非常重要的考虑在未来的地震滑坡危险性分析。
The 2010 Mw=8.8 Maule earthquake, which occurred in the subduction contact between the Nazca and the South American tectonic plates off the coast of Chile, represents an important opportunity to improve understanding of the distribution and controls for the generation of landslides triggered by large megathrust earthquakes in subduction zones. This paper provides the analysis of the comprehensive landslide inventory for the Maule earthquake between 32.5 degrees S and 38.5 degrees S. In total, 1226 landslides were mapped over a total area of c. 120,500km(2), dominantly disrupted slides. The total landslide volume is c. 10.6Mm(3). The events are unevenly distributed in the study area, the majority of landslides located in the Principal Andean Cordillera and a very constrained region near the coast on the Arauco Peninsula, forming landslide clusters. Statistical analysis of our database suggests that relief and lithology are the main geological factors controlling coseismic landslides, whilst the seismic factor with higher correlation with landslide occurrence is the ratio between peak horizontal and peak vertical ground accelerations. The results and comparison with other seismic events elsewhere suggest that the number of landslides generated by megathrust earthquakes is lower than events triggered by shallow crustal earthquakes by at least one or two orders of magnitude, which is very important to consider in future seismic landslide hazard analysis.