On April 21, 2026, Kioxia Corporation confirmed the suspension of all manufacturing operations at its Iwate Prefecture facilities following a magnitude 7.7 earthquake that occurred off the coast of northeastern Japan the previous day. The seismic event, which triggered automatic safety protocols at the Kitakami plant, has prompted a comprehensive inspection of cleanroom environments and precision lithography equipment. The company stated that the halt is a precautionary measure to ensure the integrity of its high-precision manufacturing processes.
The Kitakami site, which includes the K1 and K2 fabrication plants, is a primary hub for Kioxia’s production of advanced 3D NAND flash memory, specifically the BiCS FLASH architecture. These facilities are critical for the production of high-density storage solutions used in data centers, smartphones, and automotive electronics. According to official statements from Kioxia, the earthquake registered a high seismic intensity in the Iwate region, necessitating an immediate shutdown of sensitive machinery to prevent structural damage and wafer contamination. The K2 facility, which recently expanded capacity for 218-layer 3D NAND, is among the areas undergoing rigorous testing.
As of Tuesday morning, Kioxia reported that initial structural assessments of the buildings are complete, with no major damage to the exterior infrastructure or injuries to personnel reported. However, the company noted that the recalibration of high-precision manufacturing tools and the verification of cleanroom integrity are ongoing. These technical inspections are projected to take between 24 and 72 hours. Production will remain offline until the company can ensure that the vibration-sensitive equipment is operating within specified tolerances. The company is also monitoring the stability of the local power grid, as semiconductor fabrication requires a continuous and stable electricity supply.
The Kitakami facility accounts for a significant portion of global NAND flash output. Industry analysts note that even brief stoppages in semiconductor fabrication can lead to the loss of work-in-progress wafers, as chemical processes and thermal cycles are interrupted. Kioxia has not yet disclosed the volume of wafers affected by the power fluctuations or the emergency shutdown. The company is currently working with its joint venture partner, Western Digital, to assess the total impact on their shared production capacity and to determine if any delivery schedules for the second quarter of 2026 will be affected.
Other technology firms in the region, including Renesas Electronics and Tokyo Electron, are also conducting safety checks, though Kioxia’s NAND facilities are currently the most significantly impacted by the operational halt. The Japanese Meteorological Agency reported that the earthquake occurred at 4:12 PM local time on April 20, with the epicenter located approximately 50 kilometers off the coast of Miyagi Prefecture at a depth of 40 kilometers. Kioxia has committed to providing a detailed status update once the internal inspections of the fabrication equipment are finalized.