This dataset employs a simplified version of fault orientation relative to the stress tensors and ranks the propensity of movement as a three-level risk (high, medium, low). Fault segments in the fault systems located within the Illinois basin and surrounding portion of the eastern Midcontinent are assigned a risk based on their relative orientation to the principal horizontal stress. Horizontal stress tensors are arrayed relative to the fault segments in two different manners: a generalized single value for the average stress orientation (N 60° E for the entire domain), and a locally specific orientation of the stress tensors based on an inversion of earthquake fault plane solutions and stress indicators. The assessment of fault-slip-risk potential based on fault orientation relative to the orientation of the principal horizontal stress is improved by incorporating local stress tensor orientations over a single regional value. This layer is a product of the analysis described in: Rupp, J.A., Letsinger, S.L., and Carlson, G., 2018, Fault angle control on potential seismic slip in the Illinois Basin region: Seismological Research Letters, v 89, no 6, p. 2461-2472. doi: 10.1785/0220180153. Spatial Reference: WGS 1984 Web Mercator (Auxiliary Sphere)

{"references": ["Rupp, J.A., Letsinger, S.L., and Carlson, G., 2018, Fault angle control on potential seismic slip in the Illinois Basin region: Seismological Research Letters, v 89, no 6, p. 2461-2472. doi: 10.1785/0220180153."]}