Kyushu Recovered in Eight Days - What the Fab Restart Says About Panic Buying

The Timeline, Start to Finish

The M7.1 earthquake on July 28 (moment magnitude 6.8) halted TSMC's JASM Fab 1, Sony Semiconductor Solutions, Renesas, and Tokyo Electron sites across Kumamoto. At least 39 people were killed and more than 170 injured.

Every semiconductor site was operational within eight days:

• Renesas Nishiki Plant — resumed the evening of July 29, back to pre-earthquake capacity by July 31. The Kawajiri Plant followed from August 5.
• Tokyo Electron — restarted August 3, with no major damage found to buildings or equipment.
• TSMC JASM Fab 1 — fully restored August 4. Structural inspections confirmed building safety with water, power, and safety systems intact; the delay was equipment recalibration, not damage.
• Sony Semiconductor Solutions — gradual restart from August 4, with pre-earthquake output expected by mid-August.

TSMC also resumed Fab 2 construction, paused as an aftershock precaution, and donated ¥250 million to local recovery.

The Gap That Cost Money

For roughly one week, the publicly available picture was that JASM had no restart date. That was accurate reporting — TSMC had not published one, and the company noted the quake would require additional time for adjustment and calibration.

It was also, in hindsight, a one-day gap. TSMC's restart came the day after the last "no timeline announced" cycle.

The financial framing was visible the whole time for anyone who looked: a one-week JASM shutdown was estimated at roughly $14 million, about 0.03% of TSMC's quarterly revenue. A disruption that immaterial to the operator was never likely to run long.

What to Actually Take From This

The genuine risk Kumamoto exposed is concentration, not duration. Four significant sites in one prefecture went down on the same morning. That they all came back in eight days was a function of the damage being light — ceiling panels, wall cracks, water leaks — rather than of any resilience in your supply chain.

The next event may not be light. The question worth asking is not "when will they restart" but "how much of my BOM sits inside one seismic zone, and do I know it by fab rather than by country."