Surface electrical resistivity tomography, magnetic, and gravity surveys in Redwell Basin and the greater East River watershed near Crested Butte, Colorado, 2017

Surface electrical resistivity tomography (ERT), time-domain electromagnetics (TEM), nuclear magnetic resonance (NMR), magnetics, and gravity data were acquired in 2016, 2017 and 2018 in the greater East River Watershed near Crested Butte Colorado with a focused effort in Redwell Basin. Five ERT profiles were acquired within Redwell Basin and Brush Creek to map geologic structure at depths up to 40 meters, depending on the subsurface resistivity, using the Advanced Geosciences, Inc. SuperSting R8 resistivity meter. Approximately ten kilometers of total field magnetics data were acquired with a Geometrics G-858 cesium vapor magnetometer that detects changes in deep (tens of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations. Ten gravity stations were acquired with a LaCoste and Romberg G-model relative gravimeter to map density variations. This data release includes raw data for all methods as well as processed and/or inverted resistivity models. Digital data from all methods are provided, and data fields are defined in respective data dictionaries.

2016至2018年间，研究团队于美国科罗拉多州克雷斯特德比特（Crested Butte）周边的东河流域大范围区域采集了地面电阻率层析成像（ERT）、时域电磁法（TEM）、核磁共振（NMR）、磁法勘探与重力勘探数据，研究重点聚焦雷德韦尔盆地（Redwell Basin）。依托Advanced Geosciences, Inc.的SuperSting R8型电阻率仪，在雷德韦尔盆地与布拉什溪（Brush Creek）区域布设了5条ERT剖面，旨在依据地下电阻率差异绘制深度可达40米的地质构造图，具体探测深度受地下电阻率特性制约。研究人员采用Geometrics G-858型铯蒸气磁力仪，采集了总长约10千米的总场磁法数据，该设备可通过不同地层的磁性属性差异，识别深部（数十米至千米尺度）的地质构造变化。本次研究使用LaCoste and Romberg G型相对重力仪完成了10个重力测点的观测，以刻画地下密度分布差异。本次数据发布涵盖所有勘探方法的原始数据，以及经处理和/或反演得到的电阻率模型。本次公开提供所有勘探方法的数字化数据，各数据字段的定义详见对应的数据字典。