Helicopter-borne Electromagnetics (HEM) Area 129 Esens

BGR conducted within the project „Airborne geophysical surveys for mapping the shallow subsurface in Germany “ (D-AERO) airborne surveys at the German North Sea coast. The survey area Esens (2008/09) ranges from about Dornum and Aurich in the west to Wittmund and Werdum in the east. The size of the area is about 370 km². The area was surveyed with 23 flights totalling to 1542 line-km (437,562 survey points). The nominal separation of the 75 N-S lines and 8 W-E tie lines was 250 m and 2000 m, respectively. The maps display the geophysical parameters apparent resistivity and centroid depth derived from the HEM data at the six frequencies of the HEM system (0.4 - 130 kHz). Furthermore, horizontal and vertical slices were derived from layered-earth models (resistivities and thicknesses of six model layers).

本数据集为德国联邦地球科学与自然资源研究所（BGR）在"德国浅地表制图航空地球物理调查"（D-AERO）项目框架内，于德国北海南岸实施的航空地球物理测量数据。本次调查的埃森斯（Esens，2008/09）测区范围西起多恩姆（Dornum）与奥里希（Aurich），东至维特蒙德（Wittmund）与韦尔杜姆（Werdum），总面积约370平方千米。此次调查共完成23架次飞行，总测线长度达1542线千米，有效测点共计437562个。测线布设包含75条南北向主测线与8条东西向联络测线，二者标称间距分别为250米与2000米。本次生成的地图展示了由航空电磁（HEM）系统在0.4~130 kHz六个频率下采集的HEM数据反演得到的视电阻率与中心埋藏深度两项地球物理参数。此外，研究团队还基于层状地球模型推导得到了水平切片与垂直切片数据，涵盖6个模型层的电阻率及厚度信息。