Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Gravity and aeromagnetic surveying and modeling lines

Lines in this cover show where gravity oe aeromagnetic data have been modelled to constrain subsurface structure. Gravity and magnetic signatures result from deep structure, such as might be at hypocentral depths of earthquakes. We show only the lines for which interpretations or models are publically available. In gravmag_all, extent of the lines outside the study boundary is retained; in gravmag the lines have been clipped to the study boundary.本图幅内的线条标注了为约束地下结构而对重力与航空磁测 (aeromagnetic) 数据开展建模的对应区域。重力与磁异常信号源自深部地质结构，其赋存深度或可对应地震的震源深度。本次仅展示带有公开可用解释或模型的线条。在 gravmag_all 数据集中，保留了线条超出研究边界的部分；而在 gravmag 数据集中，线条已被裁剪至研究边界范围内。