Abstract Anthropogenic radioisotopes are the only definitive signature that a below ground nuclear test has been conducted. The depth at which a test occurs is known to be a critical parameter, affecting not only the migration time for gases to reach the surface but also their subsequent isotopic ratios. Suspected tests typically occur at sites to which the international community has no access, and their suspected location and depth must be computed. Teleseismic methods are typically used for doing this but can h…