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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Vertical Coseismic Offsets Derived From High-Resolution Stereogrammetric DSM Differencing: The 2013 Baluchistan, Pakistan Earthquake
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Vertical Coseismic Offsets Derived From High-Resolution Stereogrammetric DSM Differencing: The 2013 Baluchistan, Pakistan Earthquake

机译：垂直的电影偏移来自高分辨率立体图DSM差异：2013年Baluchistan，巴基斯坦地震

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The recent proliferation of high-resolution (<3-m spatial resolution) digital topography data sets opens a spectrum of geodetic applications in differential topography, including the quantification of coseismic vertical displacement fields. Most investigations of coseismic vertical displacements to date rely, in part, on preevent or postevent lidar surveys that are intractable or nonexistent in many locales. Stereogrammetric digital surface models (DSMs) derived from high-resolution satellite optical imagery provide a new avenue for the retrieval of spatially dense vertical coseismic displacements on a global scale. In this study, we generated 2-m resolution preseismic and postseismic DSMs from satellite optical imagery spanning the 2013 M_w7.7 Baluchistan strike-slip earthquake that occurred on the Hoshab fault in southern Pakistan. We applied the Iterative Closest Point algorithm to the DSMs to quantify the coseismic vertical displacement field at a spatial resolution of 10-30 m and to generate 3-D coseismic strain tensors. We found that across-fault vertical offsets alternated between uplift and subsidence and varied between ~1 and 3 m in a nonsystematic manner along the Hoshab fault. We show that the preexisting topography and near-fault geomorphology are variably consistent and inconsistent with the displacement kinematics of the 2013 earthquake, and we argue that these relationships highlight varied slip sense history along the Hoshab fault. Notably, topography along the southern extents of the Hoshab fault requires different surface displacement kinematics than occurred in the 2013 earthquake, suggesting that the Hoshab fault accommodates varying senses of slip (bimodal slip) through time.
机译：最近的高分辨率（<3-M空间分辨率）数字地形数据集的增殖在差分地形中打开了一系列大地测量应用，包括电影垂直位移场的量化。迄今为止，电影发电机垂直位移的大多数研究部分地依赖于诱因或后延长的激光乐队调查，这在许多地狱中是棘手的或不存在的。来自高分辨率卫星光学图像的立体图数字表面模型（DSMS）提供了一种新的全球范围内的空间密集的垂直电影位移的新途径。在这项研究中，我们从跨越2013 M_W7.7 Baluchistan滑动地震发生的卫星光学图像中产生了2-M分辨率和后近的DSMS，这是在巴基斯坦南部的Hoshab断层上发生的。我们将迭代最接近点算法应用于DSM，以以10-30μm的空间分辨率量化电动发电机垂直位移场并产生3-D电塞应变张量。我们发现跨越故障垂直偏移在隆起和沉降之间交替，沿着Hoshab故障的非系统方式在〜1和3米之间变化。我们表明，预先存在的地形和近断层地貌是可变的一致性，与2013年地震的位移运动学不一致，我们认为这些关系沿着Hoshab故障突出了不同的滑动感历史。值得注意的是，沿着Hoshab故障的南部范围的地形需要不同的表面位移运动学，而不是在2013地震中发生的，这表明Hoshab断层通过时间来适应滑动（双峰滑动）的变化感。

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