"had this been an underground nuclear test, its magnitude (3.3) would have corresponded to a yield of less than 100 tons (0.1 kilotons) in the absence of evasive measures. a nearby event identified as an earthquake in january 1996 was a factor of ten smaller (2.4), corresponding to a yield of about 10 tons." opponents of the ims had claimed the best that could be done was to recognize a 1 kt event, not concealed and of richter magnitude 4.0.