This impact is speculated to have separated the remainder of the weakened tail from the airframe, as well as the remaining three engines, which were "dispersed 500-700 meters ahead"; 19, 91 after which the aircraft flipped on its back, impacted upon, and exploded on another ridge 570 meters NW from the second ridge, near Mount Takamagahara, at 6:56 p.m. The impact registered on a seismometer located in the Shin-etsu Earthquake Observatory at Tokyo University from 6:56:27 as a small shock, to 6:56:32 as a larger shock, estimated to have been caused by the final crash.