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2011年5月11日,一个中等震级地震(MW5.1)袭击了西班牙东南部洛尔卡城和邻近地区,造成了显著的破坏和人员伤亡。通过地震影响区的野外考察对250多处主要是碎裂型(岩/土崩塌、碎裂的土质滑坡和岩崩)诱发滑坡进行了定点和特征描述。与以前该区域相似震级(MW4.7~5.0)的地震事件,以及以前预测地震期间斜坡表现的模型结果相比,本次地震诱发滑坡的数量相当大。提出了几个原因来解释这种差异:(1)地震序列中相对高震级(MW4.5)的前震可能弱化了区域内的斜坡强度;(2)这些事件产生了高的地震动峰值;(3)发生了地形场地效应。本研究的结果指出了在改进区域斜坡特征研究模型时考虑这些影响的重要性。
On 11 May 2011, a moderate magnitude earthquake (MW 5.1) hit the city of Lorca and the immediate vicinity of southeastern Spain, causing significant damage and casualties. Through the field investigation in the earthquake affected area, the landslide induced by more than 250 major landslides (rock-soil landslide, rock-broken landslide and landslide) was mainly described and characterized. Compared with the earthquakes with similar magnitudes (MW 4.7 ~ 5.0) and the previous model results of slope performance during the previous earthquake, the number of landslides induced by this earthquake is relatively large. Several reasons are presented to explain this difference: (1) Foreshocks of relatively high magnitude (MW 4.5) in seismic sequences may weaken the slope strength within the area; (2) these events produce high peak ground motion; ( 3) terrain effects have occurred. The results of this study point out the importance of considering these effects in improving the model of regional slope characterization.