In addition, surface visual effects, produced by an underground explosion, may be observed either locally or overhead by aircraft or satellites. DOE investigation has shown that the low-frequency aftershocks, that have been observed from US nuclear tests, are also associated with certain kinds of mining operations such as block caving. In a decoupled emplacement configuration high-frequency EMP is enhanced while seismic signals are diminished. Overhead imagery research suggests that plant stress from shocked ground above an underground explosion may be detected using a ratio of 690 to 420 microns of visible light. Visual inspection research has identified geological effects and operational evidence to be investigated and documented during an inspection.
Results provide input to the development of an inspectors manual for training and in-field use.
Visual inspection research is developing an inspectors manual for in-field use.