Fault kinematics and surface deformation across a releasing bend during the 2010 MW 7.1 Darfield, New Zealand, earthquake revealed by differential LiDAR and cadastral surveying
Fault kinematics and surface deformation across a releasing bend during the 2010 MW 7.1 Darfield, New Zealand, earthquake revealed by differential LiDAR and cadastral surveying
复制标题
DOI：
10.1130/b30753.1
复制
发表时间：
2013-03-01
影响因子：
4.9
通讯作者：
Bilderback, Eric
中科院分区：
文献类型：
--
作者：
Duffy, Brendan;Quigley, Mark;Bilderback, Eric
2010 M-W 7.1 Darfield地震在西北部的Greendale断层西端的右旋滑动转移到了西北趋势范围内，横穿了一个明显的跨国区，在这里被称为沃特福德释放弯道。我们使用了详细的表面映射，差异分析，对射线前和后脉冲检测和范围（LIDAR）以及财产边界（Cadastral）重新审查以产生高分辨率（厘米级）的估计值，这表明整个cose震震的地面表面位移表明表明格林代尔故障上的方向变化包含大规模释放弯曲的元素（从西方运动的角度来看断层的南侧）以及较小的限制步骤（从断层北侧的东南运动的角度来看）。这些因素导致福特释放弯曲的弯曲弯道在罢工变化时的位移降低至接近零，以及在嵌套的，局部限制的步骤中的整体释放弯曲中的存在，并随着收缩的膨胀而存在。从这一当代表面破裂事件中获得的表面变形和运动学的特殊细节说明了多方法研究的价值。我们的数据提供了对滑雪断层弯曲运动学的见解，以及在历史和史前破裂痕迹上可能存在的潜在微妙但重要的结构。
Dextral slip at the western end of the east-west-striking Greendale fault during the 2010 M-W 7.1 Darfield earthquake transferred onto a northwest-trending segment, across an apparent transtensional zone, here named the Waterford releasing bend. We used detailed surface mapping, differential analysis of pre- and postearthquake light detection and ranging (LiDAR), and property boundary (cadastral) resurveying to produce high-resolution (centimeter-scale) estimates of coseismic ground-surface displacements across the indicate that the change in orientation on the Greendale fault incorporates elements of a large-scale releasing bend (from the viewpoint of westward motion on the south side of the fault) as well as a smaller-scale restraining stepover (from the viewpoint of southeastward motion on the north side of the fault). These factors result in the Water ford releasing bend exhibiting a decrease in displacement to near zero at the change in strike, and the presence within the overall releasing bend of a nested, localized restraining stepover with contractional bulging. The exceptional detail of surface deformation and kinematics obtained from this contemporary surface-rupture event illustrates the value of multimethod investigations. Our data provide insights into strike-slip fault bend kinematics, and into the potentially subtle but important structures that may be present at bends on historic and prehistoric rupture traces.