Airborne Electromagnetic and Magnetic Survey, Yellowstone National Park, 2016 - Minimally Processed Data

Airborne electromagnetic (AEM) and magnetic survey data were collected during November and December 2016 along 4,212 line-kilometers over Yellowstone National Park, Wyoming. The survey was conducted as part of a study of the subsurface geologic structure and geothermal and groundwater resources of Yellowstone National Park. The survey was designed to image the subsurface plumbing of Yellowstone's myriad thermal features by constraining the geometry of the major hydrostratigraphic contacts and mapping regional-scale geologic structures. Data were acquired by SkyTEM ApS with the SkyTEM 312M time-domain helicopter-borne electromagnetic system together with a Geometrics G822A cesium vapor magnetometer. The survey was flown along six block-style line groups with a nominal line spacing of 450 meters (m), one block-style line group with a nominal line spacing of 250 m, two block-style line groups with a nominal line spacing of 150 m, and a series of regional reconnaissance lines with 5 km nominal line spacing. Due to terrain complexity, the mean flight height was about 48 m. The AEM depth of investigation varies considerably with subsurface resistivity, however the maximum depth of investigation is about 500 m. This data release includes minimally processed (raw) AEM and magnetic data as delivered by the contractor. A subsequent data release will include processed AEM data and inverted resistivity models used for USGS interpretation. Minimally processed digital data from production flights are provided and described in an accompanying data dictionary in open data format. The complete data package received from the contractor is included in a separate zip-file directory and described in the contractor's report (pdf file included with this data release).

2016年11月至12月，研究团队在怀俄明州黄石国家公园上空沿总长4212测线千米的航线采集了航空电磁（Airborne Electromagnetic, AEM）与磁法测量数据。本次测量为黄石国家公园地下地质构造、地热及地下水资源研究项目的一部分，旨在通过约束主要水文地层接触面的几何形态、绘制区域尺度地质构造图，成像黄石公园各类热液活动区域的地下流体通道系统。数据由SkyTEM ApS采用SkyTEM 312M时域航空电磁系统与Geometrics G822A型铯蒸气磁力仪采集获取。本次测量作业沿6组标称间距450米（m）的区块式测线、1组标称间距250米的区块式测线、2组标称间距150米的区块式测线，以及一系列标称间距5千米的区域踏勘测线开展。受地形复杂性影响，本次测量的平均飞行高度约为48米。航空电磁（AEM）的探测深度随地下电阻率变化差异显著，最大探测深度约为500米。本次数据发布包含承包商交付的轻度预处理（原始）航空电磁（AEM）与磁法测量数据。后续数据发布将包含用于美国地质调查局（USGS）解释工作的经处理航空电磁（AEM）数据及反演电阻率模型。本次发布还提供了作业飞行中获取的轻度预处理数字数据，并以开放数据格式配套的数据字典对其进行说明。承包商交付的完整数据包将收录于独立的ZIP压缩文件目录中，并由本数据发布包附带的PDF格式承包商报告进行详细阐释。