Airborne Electromagnetic (AEM) Survey in Southwest and Southeast Areas, Wisconsin, 2022

Airborne electromagnetic (AEM) and magnetic survey data were collected during March 2022 over a distance of 2,574.6 line kilometers in southeast and southwest Wisconsin. These data were collected in support of an effort to improve estimates of depth to bedrock through a collaborative project between the U.S. Geological Survey (USGS), Wisconsin Department of Agriculture, Trade, and Consumer Protection (DATCP), and Wisconsin Geological and Natural History Survey (WGNHS). Data were acquired by SkyTEM Canada Inc. with the SkyTEM 304M time-domain helicopter-borne electromagnetic system together with a Geometrics G822A cesium vapor magnetometer. The survey was acquired at a nominal flight height of 30 - 40 meters (m) above terrain. AEM data were inverted to produce models of electrical resistivity along flight paths, with typical depth of investigation up to about 400 m and 1 - 2 m near-surface resolution.

2022年3月，科研人员在威斯康星州东南部与西南部采集了航空电磁（Airborne Electromagnetic, AEM）与磁法测量数据，测线总长2574.6千米。本次数据采集服务于美国地质调查局（U.S. Geological Survey, USGS）、威斯康星州农业、贸易与消费者保护部（Wisconsin Department of Agriculture, Trade, and Consumer Protection, DATCP）以及威斯康星地质与自然历史调查局（Wisconsin Geological and Natural History Survey, WGNHS）的合作项目，该项目旨在优化基岩埋深的估算精度。数据由加拿大SkyTEM公司使用SkyTEM 304M型时域直升机载电磁系统，搭配Geometrics G822A型铯蒸气磁力仪完成采集。本次测量的标称飞行高度为距地表30至40米。科研人员对航空电磁数据开展反演处理，生成了测线沿线的电阻率模型，其典型探测深度可达约400米，近地表分辨率可达1至2米。