The news
The TSMC Kumamoto fab in southern Japan had fully returned to normal operations after the July 28, 2026, earthquake, Taiwan Semiconductor Manufacturing Co. (TSM) said on August 4, 2026. It also pledged 250 million yen for local disaster relief, Focus Taiwan reported.
The quake struck at 4:27 p.m. local time on July 28. The U.S. Geological Survey measured it at magnitude 6.8, while Nikkei Asia and TrendForce reported it as magnitude 7.1. It reached 7, the top of Japan's seismic intensity scale, in parts of Kumamoto Prefecture, EE Times Japan reported; in Kikuyo, the town where the fab sits, Nikkei Asia put the reading at upper 5.
The plant is run by Japan Advanced Semiconductor Manufacturing (JASM), TSMC's manufacturing subsidiary in Japan, and staff were evacuated right after the quake under its evacuation criteria. In a July 29 post on X, JASM said all employees were safe, water, power and safety systems were working normally and raw-material supply was unaffected, but that inspecting and adjusting equipment would take some time, according to EE Times Japan. A TSMC spokesperson told Nikkei Asia the structure had been found safe.
As of August 3, TrendForce reported that the first fab was still halted for equipment checks, with no restart date announced. The next day, TSMC said operations were fully back to normal and credited its Kumamoto employees and suppliers, Focus Taiwan reported. That fab has run specialty processes since the end of 2024, making logic chips for cars, home appliances and image sensors, according to Focus Taiwan and EE Times Japan.
The second fab, still under construction, suffered no setbacks, TSMC said. JASM said construction resumed on July 29 after safety checks. According to Focus Taiwan, the second fab is slated to start production in 2028 on 3-nanometer technology.
The numbers
- Quake time
- 4:27 p.m. local time, July 28, 2026
- Magnitude
- 6.8 (USGS); 7.1 (Nikkei Asia, TrendForce)
- Seismic intensity in Kikuyo, where the fab sits
- Upper 5 (Nikkei Asia)
- TSMC relief pledge
- 250 million yen
- Second fab target
- 3nm production in 2028 (Focus Taiwan)
Why CEOs should care
For chip buyers, the headline is good but incomplete. TSMC has not said how much output was lost or whether any wafers in process were scrapped, and a production pause can show up later as delivery delays. Companies that source parts made at JASM, directly or through suppliers, should ask whether lots in the fab on July 28 were affected and whether any delivery dates moved.
For boards and CFOs, the episode is a reminder that diversifying from Taiwan to Japan changes earthquake exposure rather than removing it. Ask whether supply plans assume Taiwan and Kumamoto will never be disrupted at the same time, and how many days of buffer inventory cover a stoppage of several days like this one. Contracts should spell out allocation rules when a single site goes down.
For operations leaders, note what TSMC credited for the recovery: its Kumamoto employees and its suppliers. Restarting a fab after a quake means recalibrating sensitive tools, so ask critical suppliers where their equipment vendors' service engineers are based and how fast they can reach a site after a disaster.
The bigger picture
The quake hit a dense chip cluster. Nikkei Asia reported that Sony Group paused chip production, Renesas Electronics suspended two Kumamoto plants after finding cracks, water leaks and fallen ceiling panels, and Toyota halted three plants in neighboring Fukuoka Prefecture. Nikkei counted 13 confirmed deaths as of July 29. Nearby suppliers were hit too: TrendForce reported that equipment maker Tokyo Electron's Kyushu unit, with sites in Koshi and Ozu, restarted on August 3.
What happened next
On August 11, 2026, TSMC and Sony Semiconductor Solutions agreed to form a joint venture in Koshi City, Kumamoto Prefecture, to develop and make next-generation smartphone image sensors, with volume production expected in 2029, TSMC said. TSMC plans to contribute about 282 billion yen and Sony about 465 billion yen in phases, subject to regulatory approvals. EE Times Japan reported that Koshi registered lower 6 during the July 28 quake.
Recovery at some other plants in the cluster took longer. EE Times Japan reported that Renesas's Kawajiri plant returned to pre-quake capacity on the night of August 23, and that Sony had planned a phased restart from August 4, expecting pre-quake output by mid-August. What to watch: whether TSMC discloses any quake-related costs with its third-quarter results, and whether the second Kumamoto fab holds its 2028 schedule.
