Study on the Changes of Geometrical and Structural Characteristics along the Coseismic Surface Ruptures of the 2008 Wenchuan Earthquake at Wujia yard,Shaba Village
In the past,numerous studies have focused on the influence of large-scale(several kilometers)topography on the coseismic surface ruptures of large earthquakes.However,there are few reports on short-distance scales(10～100 meters).Based on the geometric patterns and field mapping of the surface rupture zone of the 2008 Wenchuan earthquake at the Wujia yard,Shaba Village,this paper aims to provide a case and the factors for exploring the rupture that exhibits significant geometric structural changes at short-range scales.In particular,we used the LiDAR technology and UAV photogrammetry to precisely obtain the near-fault landforms and the fault rupturing characteristics.We suggest that the surface rupture zone surrounding Wujia yard is concentrated into a single fault when the landform is relatively stable on the southwest side.The ruptures splited into three branch faults at the undulating landform,such as the negative landform in the north-eastward side.The findings imply that the coseismic surface ruptures may be bifurcated due to localized topography,which might help a single fault rupture into several branches.
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