Before revision: ( no references) July 30, 2020 – The epicenter of a 5.8 magnitude earthquake south of Japan was miscalculated, causing the EEW to overestimate the size of the earthquake to be at a magnitude of 7.3, as well as erroneously placing the epicenter to much closer to Japan's main island, Honshū, than it actually was.
After revision: ( ref: URL July 30, 2020 – The epicenter of a 5.8 magnitude earthquake south of Japan was miscalculated, causing the EEW to overestimate the size of the earthquake to be at a magnitude of 7.3, as well as erroneously placing the epicenter to much closer to Japan's main island, Honshū, than it actually was.