A 2-dimensional P-wave velocity model (ASCII format) along the MARGIN Transect (Line 3) of the Juan de Fuca Ridge-to-Trench study

This data set consists of a 2-dimensional P-wave velocity model and depth-to-reflectors from first-arrival travel-time tomography of OBS wide-angle refraction and reflection data acquired along the MARGIN Transect (Line 3) of the Juan de Fuca Ridge-to-Trench study. The model is provided in both MATLAB and ASCII format with columns as defined below and within files. Here we present the ASCII files - see the associated data set for the MATLAB version of this model. The ASCII file contents are as follows. Velocity model (L3_v) in km/s for all 107 depth intervals and 1705 x nodes. L3_vmask is the same data masked to only contain velocity values in regions of good ray coverage. Depth to reflectors (L3_bathymetry, L3_basement, L3_moho) for 1705 x nodes in km below sea level. L3_z provides depths for 107 z nodes in km below seafloor. L3_x provides distance in km along the transect from the Oregon Transect (L1), with negative values indicating distances south of L1. L3 lat and lon are provided for 1705 x nodes in decimal degrees. L3_zero provides the lat lon coordinates in decimal degrees of the intersections of L1 and L3. The seismic velocity model is referenced in Horning et al., 2016 and in Canales et al., 2017 and details on acquisition and processing maybe found in those papers. The data set was generated as part of the project called Evolution and Hydration of the Juan de Fuca Crust and Uppermost Mantle: A Plate-Scale Seismic Investigation from Ridge to Trench. Funding was provided through NSF awards OCE10-29305,OCE10-29411.

本数据集包含通过胡安·德富卡脊到海沟研究MARGIN断面（3号线）的海底地震仪（OBS）广角折射反射数据初至走时层析成像得到的二维P波速度模型及反射层深度数据。该模型以MATLAB和ASCII两种格式提供，列定义见下文及文件内部说明。本文呈现ASCII文件——该模型的MATLAB版本请参见关联数据集。ASCII文件内容如下：速度模型（L3_v）单位为km/s，覆盖全部107个深度间隔及1705个x节点；L3_vmask为仅包含良好射线覆盖区域速度值的掩码数据；反射层深度文件（L3_bathymetry、L3_basement、L3_moho）对应1705个x节点，单位为海平面以下km；L3_z提供107个z节点的海底以下深度（km）；L3_x为沿断面距俄勒冈断面（L1）的距离（km），负值表示L1以南区域；L3 lat和L3 lon为1705个x节点的十进制度坐标；L3_zero为L1与L3交点的十进制度经纬度坐标。该地震速度模型被霍宁等人（2016）及卡纳莱斯等人（2017）引用，数据采集与处理细节详见上述文献。本数据集为“胡安·德富卡地壳与最上地幔的演化及水合作用：从脊到海沟的板块尺度地震调查”项目成果之一，资金由美国国家科学基金会（NSF）奖项OCE10-29305及OCE10-29411提供。