From Crystals to Crustal?Scale Seismic Anisotropy: Bridging the Gap Between Rocks and Seismic Studies With Digital Geologic Map Data in Colorado

Deep continental crustal structures are enigmatic due to lack of direct exposures and limited tools investigate them remotely. Seismic waves can sample these rocks, but most seismic methods focus on coarse while laboratory measurements concentrate crystal-scale rock properties, little work has been conducted bridge this interpretation gap. In some places, geologic maps crystalline basement provide samples the intermediate-scale fabrics that may represent in situ deep crust. However, previous research not considered natural geometric variations from map data, nor is heterogeneity typically included map-scale property calculations. Here, we test how influence anisotropy Colorado by analyzing structural data maps, combining those with bulk elastic tensors calculate evaluating resulting comparisons observed receiver function A1 (360° periodic) arrivals. Crystalline fabrics, predicted tectonic positively correlate shallow Additionally, widespread correlations occur between mapped fault traces regional foliations, implying preexisting mechanical have strongly influenced subsequent reactivation. We interpret various contact types (e.g., lithologic structural) generate arrivals multiple parallel features faults, intrusions) contribute a seismically visible grain. Therefore, Colorado's exhumed basement, as expressed outcrops offers insight into modern geological geophysical structure.