Lost River Fault Zone Near Borah Peak, Idaho

<p>The contribution comprises high-resolution topography and orthomosaics of part of the Lost River fault zone (LFRZ), Idaho, USA. The data set covers the northern ~16 km of the surface-rupture that occurred on the LRFZ in the Mw 6.9 1983 Borah Peak Earthquake. Point clouds and digital surface models (DSMs), were generated from low-altitude aerial photographs using Structure-from-Motion and multi-view stereo processing (SfM). The LRFZ is a major, range-bounding, west-dipping normal fault in the northern Basin and Range province. The Mw 6.9 1983 Borah Peak earthquake occurred on it and created surface rupture along the southern portion of the Warm Spring section and the entire Thousand Springs section of the fault (Crone et al., 1987; DuRoss et al., 2019).</p> <p>The Warm Spring and Thousand Springs sections are separated by the Willow Creek Hills, which form a structural boundary. We used unoccupied aerial systems (UAS) and a tethered \"helikite\" balloon to acquire aerial photographs, which were combined with ground control georeferencing to create two point clouds that model the topography at high resolution (< 10 cm) along the northern ~16 km of surface rupture. One point cloud covers the southern ~9 km of the Warm Spring Section and a second point cloud covers the northern ~7 km of the Thousand Springs Section.</p><p> DSMs were generated from the point clouds, and orthomosaics of each area were made from the aerial photographs. The primary motivation for acquisition of the data set was study of the surface offset across the Willow Creek Hills structural boundary from the 1983 earthquake and prehistoric surface-rupturing events (DuRoss et al., 2019). <br /><br /> <u>For more information, see the publication:</u><br /> DuRoss, C.B., Bunds, M.P., Gold, R.D., Briggs, R.W., Reitman, N.G., Personius, S.F., Toke, N.A., 2019, Variable normal-fault rupture behavior, northern Lost River fault zone, Idaho, USA, Geosphere, v 15,https://doi.org/10.1130/GES02096.1 </p>

本数据集包含美国爱达荷州失落河谷断裂带（Lost River fault zone, LRFZ）部分区域的高分辨率地形数据与正射影像图。该数据集覆盖了1983年Mw 6.9级博拉峰地震中LRFZ地表破裂带北部约16 km的范围。研究团队通过低空航空影像，经运动恢复结构（Structure-from-Motion, SfM）与多视图立体处理（multi-view stereo processing）生成了点云与数字地表模型（digital surface models, DSMs）。

LRFZ是盆地与山脉省北部一条重要的西倾正边界断层。1983年Mw 6.9级博拉峰地震即发生于此，沿断层的暖泉段南部与千泉段全部区域均形成了地表破裂（Crone et al., 1987; DuRoss et al., 2019）。

暖泉段与千泉段被作为构造边界的威洛溪山分隔。本研究使用无人航空系统（unoccupied aerial systems, UAS）与系留"helikite"气球采集航空影像，并结合地面控制点地理配准，生成了两套点云，可对该地表破裂带北部约16 km范围的地形进行分辨率优于10 cm的高精度建模。其中一套点云覆盖暖泉段南部约9 km范围，另一套覆盖千泉段北部约7 km范围。

研究人员从点云中生成数字地表模型，并基于航空影像制作了各区域的正射影像图。本数据集采集的核心动机为研究1983年地震及史前地表破裂事件在威洛溪山构造边界处的地表位移（DuRoss et al., 2019）。

<u>更多信息请参阅相关论文：</u>
DuRoss, C.B., Bunds, M.P., Gold, R.D., Briggs, R.W., Reitman, N.G., Personius, S.F., Toke, N.A., 2019, Variable normal-fault rupture behavior, northern Lost River fault zone, Idaho, USA, Geosphere, 第15卷, https://doi.org/10.1130/GES02096.1