“…In general, the UNE observables that might be detected by MSIR fall into five categories: 1) disturbed earth at the surface (due to the shock wave from the explosion), 2) plant stress in the vicinity of the UNE, 3) artifacts of human activity, 4) thermal effects, and 5) novel materials at the surface. These are described in detail and relevant scientific work referenced in the MSIR Primer [Henderson, 2010]. They will be summarized here with a focus on the physical conditions necessary to generate the observable, and what measurements might be made to characterize the observable.…”