According to TechNews and UDN Money, a magnitude-7.1 earthquake struck Kumamoto on July 28, 2026. Tokyo Electron (TEL) halted two Kumamoto plants for inspection on July 29; TSMC's JASM confirmed staff safety and structural integrity and resumed operations, while Sony, Renesas, Mitsubishi Electric and Ebara were still checking their local facilities.
How severe was the Kumamoto earthquake, and what damage did it cause locally?
A magnitude-7.1 earthquake hit Japan's Kumamoto Prefecture on the afternoon of July 28, 2026, according to a TechNews report [E1]. UDN Money, citing Japanese media, reported the epicenter was in the Kumamoto region at a shallow depth of 10 kilometers, with the maximum seismic intensity of 7 recorded in Uki City and Hikawa Town; Kikuyo Town, where TSMC's Japan fab is located, registered an intensity of 5-upper [E17].
Kumamoto Airport briefly closed after the quake but reopened the same evening once runway inspections found no damage, per UDN Money [E18]. The same report said a large shopping mall, Aeon Mall Kumamoto, suffered an explosion and building collapse; Japanese media assessed that multiple people were presumed dead with others trapped, and rescue work was ongoing with the death toll still unconfirmed [E19].
Why did Tokyo Electron (TEL) halt its Kumamoto plants, and were the facilities damaged?
TechNews reported that Tokyo Electron's two Kumamoto facilities would halt operations on July 29 for safety inspections, with the company saying it would announce immediately if and when the plants resume production [E2]. As of the report, TEL said its Koshi facility (Koshi City, Kumamoto) and Otsu facility (Otsu Town, Kikuchi District, Kumamoto) had shown no major damage to buildings or equipment [E3]. These two sites are responsible for research and production of coater/developer equipment, cleaning equipment, and 3D packaging equipment, according to TechNews [E4].
What happened at Sony's image sensor plants in Kumamoto?
TechNews reported that Sony was continuing to confirm staff safety and damage status at its Image Sensor Fab 1 in Kikuyo Town and Image Sensor Fab 2 in Koshi City [E6]. No damage assessment had been finalized in the report.
How did TSMC's JASM fab respond to the earthquake, and what construction impact followed?
TSMC said on July 28 that, to ensure staff safety, its JASM fab in Kumamoto activated internal safety procedures and evacuated personnel immediately after the quake; all staff were confirmed safe, and a building damage inspection confirmed structural integrity, allowing the fab to gradually resume operations, per TechNews [E5]. Separately, UDN Money reported the JASM construction site itself was unaffected, but part of the ongoing construction work was paused as a precaution given the possibility of aftershocks [E10].
What is the damage-confirmation status at Renesas, Mitsubishi Electric, and Ebara?
According to TechNews, three other Kumamoto-based equipment and chip makers were still assessing the situation as of the report:
- Mitsubishi Electric, which operates a 24-hour power semiconductor plant in Koshi City and Kikuchi City, was rushing to confirm whether any staff were injured and the status of production [E7].
- Automotive chipmaker Renesas Electronics was confirming damage at its Kawajiri plant (Kumamoto City) and Nishiki plant (Nishiki Town, Kumamoto) [E8].
- Ebara was confirming the situation at its semiconductor-equipment parts plant in Nankan Town in northwestern Kumamoto Prefecture [E9].
None of these three companies had reported a finalized damage assessment at the time of the TechNews report.
How were Taiwanese-invested companies in Kumamoto affected?
UDN Money reported that Taiwan's Ministry of Economic Affairs, through its Fukuoka economic office, made initial inquiries to Taiwanese-invested firms operating in Kumamoto — including Advantech, Delta Electronics, U-Ming, and Tokyo Star — and all responded that staff were safe and plant operations were currently unaffected [E11].
How significant is the JASM fab to TSMC's overall capacity and strategy?
UDN Money, citing analysts, laid out JASM's scale relative to TSMC's broader operations:
| Metric | Figure | Source |
|---|
| JASM Fab 1 monthly capacity | 20,000 wafers (28/22/16/12nm) | UDN Money [E13] |
| Share of TSMC's total capacity | ~2.6% | UDN Money [E13] |
| Share of TSMC's 2026 revenue | ~1% | UDN Money [E14] |
| JASM Fab 2 target process / timing | 3nm, mass production planned for 2028 | UDN Money [E15] |
JASM was established in 2021 and began construction of Fab 1 in April 2022, according to UDN Money. TSMC holds a majority stake, with other shareholders including Sony Semiconductor Solutions, Denso, and Toyota Motor [E16].
How did capital markets react to the earthquake?
UDN Money reported that TSMC's ADR continued to correct in Tuesday morning trading, falling by approximately 3.8% [E12].
What this means
The picture that emerges from these reports is one of contained, not catastrophic, impact on the chip supply chain. TSMC's JASM fab — which TechNews and UDN Money both confirmed had passed structural inspection and resumed operations [E5][E10] — represents only about 2.6% of TSMC's total capacity and roughly 1% of its 2026 revenue [E13][E14], even as its ADR fell 3.8% in early Tuesday trading [E12], a reaction that appears larger than the confirmed direct exposure at this fab. Meanwhile, TEL's two halted plants [E2] and the still-unconfirmed status at Sony, Mitsubishi Electric, Renesas, and Ebara [E6][E7][E8][E9] show that as of the reports, damage assessment across Kumamoto's broader chip cluster remained incomplete — even as TEL's own facilities showed no major damage so far [E3], and Taiwanese-invested firms in the area reported no operational impact [E11]. The quake's more severe consequences were concentrated outside the chip sector, at intensity-7 zones in Uki City and Hikawa Town and at the collapsed Aeon Mall Kumamoto [E17][E19], underscoring that the industrial impact and the human toll of this event are, per current reporting, two distinct pictures.