Southern Sea Trough, a subduction zone off Honshu’s south coast
A magnitude 5.8–5.9 earthquake struck southern Ibaraki and rattled Tokyo, injuring dozens across five prefectures. Trains faced delays; Shinkansen service remains normal. Authorities set up a task force to assess damage as residents brace for possible aftershocks.
Japan’s Earthquake Research Committee has updated risk projections for the Kinki region, including Osaka and Kobe, citing a 50–60% chance of a magnitude 6.8+ quake over the forecast period. The assessment, based on 45 active faults, places Kinki’s risk on par with Tokyo’s region, amid broader concerns about a Nankai Trough megathrust event that could devastate coastal areas.
The operator has withdrawn its safety screening for the Hamaoka No. 3 and 4 reactors, citing serious problems in corporate culture and governance. Public trust has become the priority as the company plans to reapply after implementing reforms; leaders will step down while a new president takes over.