Luangwa Rift Fault Scarp Measurements

First Release associated with submission of article to EGU Solid Earth. Scarp height measurements for faults in the Luangwa Rift performed by Tess Turner for her University of Bristol MSci Earth Sciences final year project. If you use these measurements please cite the following paper in addition to this dataset: Turner, T., Wedmore, L.N.J., Biggs, J., Williams, J. Sichingabula, H.M., Kabumbu, C. Banda, K. The Luangwa Rift Active Fault Database and fault reactivation along the southwestern branch of the East African Rift. <em>In preparation for Solid Earth</em> These measurements were performed on SRTM data using the method outlined in Wedmore et al., 2020. Topographic profiles were sampled event 30 m and stacked at 120 m intervals along strike. Four faults in the Luangwa Rift have been measured using this technique: The Chipola, Chitembo, Kabungo and Molaza faults. The traces of these faults, and all other known active faults in the Luangwa Rift have been separately archived as part of the Luangwa Rift Active Fault Database. <strong>Data Format</strong> Files are provided in comma separated value (csv) format. Each file contains one header line with descriptions of the data contained within each column. The column headings and extra information are summarised in the table below. Where data columns #5-10 are blank, this is because no measurements were possible in the profile corresponding to that particular row number. If columns 11-16 are blank, this is because there are no scarp height measurements within the sampling window of the moving average. <strong>Attribute Table</strong> Attribute Table for the measurements of scarp height in the Luangwa Rift Column # Attribute Units Data Type Notes 1 Longitude decimal degrees Float 2 Latitude decimal degrees Float 3 Distance Along Fault kilometers Float 4 Distance Along Fault meters Integer 5 Scarp Height meters Float Mean scarp height measurement of 10,000 iterations of scarp height with varying subset of points in the hanging wall, scarp and footwall slopes. 6 Scarp Height Standard Deviation meters Float Standard deviation of 10,000 iterations of meausuring the scarp height with varying subset of points in the hanging wall, scarp and footwall slopes. 7 Upper Slope Angle degrees Float Mean upper slope dip angle of 10,000 iterations of subset of points selected from the footwall slope (above the top of the fault scarp). 8 upper Slope Angle Standard Deviation degrees Float Standard devation of upper slope angle of 10,000 random subsets of the points selected on the upper slope of the fault. 9 Lower Slope Angle degrees Float Mean lower slope dip angle of 10,000 iterations of subset of points selected from the hanging wall slope. 10 lower Slope Angle Standard Deviation degrees Float Standard devation of lower slope angle of 10,000 random subsets of the points selected on the lower slope of the fault. 11 Filtered median offset (1 km) meters Float median scarp height over 1 km of the distance along strike (0.5 km either side of the point). 12 filtered standard deviation (1km) meters Float standard deviation scarp height over 1 km of the distance along strike (0.5 km either side of the point). 13 Filtered median offset (3 km) meters Float median scarp height over 3 km of the distance along strike (1.5 km either side of the point). 14 filtered standard deviation (3km) meters Float standard deviation scarp height over 3 km of the distance along strike (1.5 km either side of the point). 15 Filtered median offset (5 km) meters Float median scarp height over 5 km of the distance along strike (2.5 km either side of the point). 16 filtered standard deviation (5km) meters Float standard deviation scarp height over 5 km of the distance along strike (2.5 km either side of the point). <br> <strong>Version Control</strong><br> This release is archived as part of the publication Turner et al. (submitted to EGU Solid Earth). It is intended that this database will be updated in the future as high resolution topography products become available and/or methods for measuring fault scarps improve. Please contact Luke Wedmore &lt;[e-mail]&gt; for more information or if you spot any errors. <strong>References</strong><br> Wedmore, L.N.J., Biggs, J., Williams, J.N., Fagereng, Å., Dulanya, Z., Mphepo, F., Mdala, H. (2020) Active Fault Scarps in Southern Malawi and Their Implications for the Distribution of Strain in Incipient Continental Rifts. _Tectonics_, 39(3), e2019TC005834, doi.org/10.1029/2019TC005834本数据集为投稿至《EGU Solid Earth》期刊的论文配套首次发布版本。本次卢安瓜裂谷（Luangwa Rift）内断层崖高测量数据，由泰丝·特纳（Tess Turner）基于其在布里斯托大学地球科学硕士阶段的毕业设计项目完成。若使用本测量数据，请在引用本数据集的同时，引用如下论文：Turner, T., Wedmore, L.N.J., Biggs, J., Williams, J., Sichingabula, H.M., Kabumbu, C., Banda, K. *The Luangwa Rift Active Fault Database and fault reactivation along the southwestern branch of the East African Rift*. <em>In preparation for Solid Earth</em>。本次测量基于SRTM数据，采用Wedmore等人2020年提出的方法开展。地形剖面以30米为间隔采样，并沿断层走向以120米为间隔进行叠加。本次技术共测量了卢安瓜裂谷内4处断层：奇波拉（Chipola）断层、奇滕博（Chitembo）断层、卡温古（Kabungo）断层以及莫拉扎（Molaza）断层。上述断层的展布轨迹，以及卢安瓜裂谷内所有其他已知活动断层的展布轨迹，已作为卢安瓜裂谷活动断层数据库（Luangwa Rift Active Fault Database）的一部分单独归档。 <strong>Data Format</strong> 文件以逗号分隔值（comma separated value, CSV）格式提供。每个文件均包含一行表头，用于说明各列数据的含义。列标题及补充信息汇总如下表所示。若第5至10列数据为空，则代表对应行号的剖面无法开展测量工作；若第11至16列数据为空，则代表该移动平均采样窗口内未获取到崖高测量数据。 <strong>Attribute Table</strong> 卢安瓜裂谷崖高测量属性表 | 列号 | 属性名称 | 单位 | 数据类型 | 备注 | | --- | --- | --- | --- | --- | | 1 | 经度 | 十进制度 | 浮点型 | - | | 2 | 纬度 | 十进制度 | 浮点型 | - | | 3 | 断层沿线距离 | 千米 | 浮点型 | - | | 4 | 断层沿线距离 | 米 | 整型 | - | | 5 | 崖高 | 米 | 浮点型 | 基于10000次迭代计算得到的平均崖高，迭代过程中对断层上盘、崖面及下盘斜坡的点集进行随机采样 | | 6 | 崖高标准差 | 米 | 浮点型 | 10000次随机采样迭代计算得到的崖高测量结果的标准差 | | 7 | 上斜坡角度 | 度 | 浮点型 | 基于10000次迭代计算得到的平均上斜坡倾角，迭代点集选自断层崖顶部上方的下盘斜坡 | | 8 | 上斜坡角度标准差 | 度 | 浮点型 | 10000次随机选取上斜坡点集迭代得到的上斜坡角度标准差 | | 9 | 下斜坡角度 | 度 | 浮点型 | 基于10000次迭代计算得到的平均下斜坡倾角，迭代点集选自断层上盘斜坡 | | 10 | 下斜坡角度标准差 | 度 | 浮点型 | 10000次随机选取下斜坡点集迭代得到的下斜坡角度标准差 | | 11 | 滤波后中位偏移量（1 km） | 米 | 浮点型 | 沿断层走向1 km范围内（测点两侧各0.5 km）的崖高中位值 | | 12 | 滤波后标准差（1 km） | 米 | 浮点型 | 沿断层走向1 km范围内（测点两侧各0.5 km）的崖高标准差 | | 13 | 滤波后中位偏移量（3 km） | 米 | 浮点型 | 沿断层走向3 km范围内（测点两侧各1.5 km）的崖高中位值 | | 14 | 滤波后标准差（3 km） | 米 | 浮点型 | 沿断层走向3 km范围内（测点两侧各1.5 km）的崖高标准差 | | 15 | 滤波后中位偏移量（5 km） | 米 | 浮点型 | 沿断层走向5 km范围内（测点两侧各2.5 km）的崖高中位值 | | 16 | 滤波后标准差（5 km） | 米 | 浮点型 | 沿断层走向5 km范围内（测点两侧各2.5 km）的崖高标准差 | <strong>Version Control</strong> 本发布版本已作为Turner等人（投稿至《EGU Solid Earth》）论文的附属数据完成归档。未来随着高分辨率地形数据产品的问世以及断层崖测量方法的优化，本数据库将进行更新。若需了解更多信息，或发现数据存在错误，请联系卢克·韦德莫尔（Luke Wedmore），邮箱：[e-mail]。 <strong>References</strong> Wedmore, L.N.J., Biggs, J., Williams, J.N., Fagereng, Å., Dulanya, Z., Mphepo, F., Mdala, H. (2020) 马拉维南部活动断层崖及其对初始大陆裂谷应变分布的启示. *Tectonics*, 39(3), e2019TC005834, doi.org/10.1029/2019TC005834