A magnitude 7.0 earthquake has struck the area where TSMC’s fab in Japan is located.
A magnitude 7.1 earthquake struck Kumamoto Prefecture in Japan's Kyushu region at 4:27 p.m. local time on July 28. Japan's seismic intensity scale registered a maximum of 7 in Uto and Hikawa, with Kikuyo Town near the epicenter recording an upper 5. Emergency warnings went out across seven Kyushu prefectures, including Fukuoka, Nagasaki and Kagoshima, and a tsunami advisory of up to 1 meter was issued for coastal areas. Chip analyst Jukan flagged that the quake struck the area around TSMC's Japan fab. TSMC's Japan subsidiary, JASM (Japan Advanced Semiconductor Manufacturing), said it evacuated staff under its emergency protocol once the intensity met its threshold. Everyone evacuated was confirmed safe.
Reports say JASM's two fabs sit within the same 20-kilometer radius as Sony's image-sensor plant, its joint venture fab with TSMC, and a Fujifilm facility, all in Kikuyo Town. That clustering is the result of Japan's push to rebuild its chip industry by concentrating new capacity around Kumamoto. The 2011 Tohoku disaster taught the industry not to pack a supply chain into one region, yet the same structure repeated itself here.
The quake knocked out power to roughly 40,000 households and halted bullet-train service. Whether the fabs themselves sustained damage hasn't been confirmed, but TSMC's US-listed shares had already fallen 2.75% to $388.10 by the close. The risk got priced in before any damage assessment came out.
Kumamoto was hit by a magnitude 7.3 mainshock back in 2016, with the same maximum intensity of 7. Around 50 people died in the quake itself, but continued displacement and gaps in medical care pushed the final toll to 275 dead and 2,739 injured over the following four months. What happened after the quake mattered more than the quake itself.
A standard statement: evacuation followed emergency protocol, and employee safety was confirmed first.
The fact that TSMC, Sony and Fujifilm all sit within the same 20-kilometer radius in Kikuyo is itself a structural risk, separate from how well any one company's protocol worked.
It comes down to one thing. Does TSMC's seismic design hold up again, or does this 20-kilometer concentration turn into a real problem. Here's the test. If both fabs return to normal operation within a day or two of safety checks, the design held again. If even one stays down for days, or damage keeps surfacing the way it did in 2016, the old warning about concentrating a supply chain in one place just became real again.
Awaiting gradingTo be scored within days: whether JASM's fabs returned to normal operation quickly, or suffered an extended shutdown.