Chips Came Back in Eight Days. Cars Won't Until August 19 — Kumamoto Day 8, and Why Honda Shut Saitama and Suzuka the Same Day Renesas Moved Up Its Restart

This article follows our day-7 update from the previous day, August 3, organizing the situation as of day eight of the earthquake, August 4. Please also see our day-5 update and our initial status report from the night of the quake. Through day seven, the question was whether restarted factories could actually ship anything. On day eight, what stood out was how differently recovery speed varies by industry, even under the same earthquake. On the very day Renesas moved up its restart, Honda added more plants halting four-wheel vehicle production.

Why Are Semiconductors and Automakers Moving in Opposite Directions After the Same Quake?

A fab's recovery basically moves forward once its own building and equipment clear inspection. Renesas's Kawajiri plant, in fact, moved up its planned Aug. 5 restart by a day and resumed production on Aug. 4 instead (Renesas official third statement, July 31; fourth statement, Aug. 4). The word "moved up" appearing eight days into the earthquake says something on its own: the semiconductor side is recovering faster than expected.

Automaking, on the other hand, spread in the opposite direction eight days in. Honda announced it would halt four-wheel vehicle production at plants far from Kumamoto — its Saitama plant and its Suzuka plant (Honda's official statement, updated Aug. 4). The reason isn't damage to Honda's own facilities; it's that a supplier's parts aren't arriving. Where a fab can restart on its own judgment, automaking falls like dominoes the moment one parts supplier goes down, reaching all the way to distant assembly plants. That difference is the biggest reason the two industries' fortunes diverged on day eight. For more on why semiconductor concentration tends to create this kind of single point of failure, see our earlier piece on supply-chain redundancy after the quake.

How Far Have the Fabs Recovered?

The clearest move was Renesas's accelerated restart. Its official third statement (July 31) had said the Kawajiri plant "plans to resume production progressively from August 5," but its official fourth statement (Aug. 4) said the company "moved up the plan and resumed production progressively today." The target after restarting is unchanged: return to "pre-earthquake production capacity (on a wafer-input basis — the capacity to feed wafers into the line) within about three weeks of resuming production." Starting a day early means hitting that target a little earlier too.

Sony Semiconductor Manufacturing's Kumamoto Technology Center had said, in its official second statement (July 31), that it "plans to resume operations in phases from August 4" and "expects to return to pre-earthquake operating levels by mid-August." But as of Aug. 5, there is still no official third statement confirming that the Aug. 4 restart actually took place. If things went as planned, it should be running — but no primary source yet backs that up, which is the accurate way to put it. Tokyo Electron Kyushu has issued no new release since entering August; its latest remain the July 29 second statement and a July 31 donation announcement. Mitsubishi Electric's official third statement for its Kumamoto-area plants (Aug. 3) said it is "resuming production line by line, as each completes equipment startup," targeting "a near-normal operating posture by around the end of August." For a closer look at how one company — Renesas — has navigated the recovery, see our company deep-dive on Renesas.

The biggest single move, though, came from TSMC's Kumamoto fab (JASM), which had stayed silent the longest. The next section covers it in full.

When Did JASM Recover — and How Was TSMC's Silence Finally Broken?

A week into the earthquake, TSMC's official silence — which this series has tracked from the start — was finally broken on the night of Aug. 3. But it wasn't a press release. It was a post from TSMC Japan's official X account (@TSMCinJapan). The post said "thanks to the efforts of our local employees and suppliers, the JASM fab was able to recover quickly," confirming that JASM's Kumamoto fab was back to normal production, alongside a 250-million-yen reconstruction donation.

Kyodo News (10:47 p.m., Aug. 3), Nikkei (10:52 p.m.), and the Kumamoto Nichinichi Shimbun (9:55 p.m.) all reported this independently, and the next day, Aug. 4, Focus Taiwan (via CNA) confirmed the same through TSMC's press contacts. Taiwan's Taipei Times report (Aug. 4, via CNA) that TSMC "announced a full return to normal operations at JASM," with no damage to the under-construction second fab, is best understood as a follow-up corroborating that same X post. Multiple independent outlets confirming the same content raises the reliability of the information considerably.

Even so, TSMC's official press center (pr.tsmc.com) still has not posted a single release about the Kumamoto earthquake or JASM as of Aug. 5, with the latest item remaining its July 16 quarterly earnings report. So the accurate way to put it is: TSMC has issued zero official press releases, but JASM's Kumamoto fab recovery is nonetheless effectively confirmed through TSMC Japan's official X post and multiple independent news reports.

As for scale, JASM's Kumamoto fab runs a monthly capacity of about 20,000 wafers (28-12nm processes), according to TrendForce's analysis (July 29) — less than 3% of TSMC's total capacity. The earthquake's impact on TSMC's overall supply appears limited, but as of Aug. 5, no research firm has yet published a quantified read on pricing or supply impact from the quake. That picture is still to come.

To put this recovery speed in historical context, an analysis by Toyokeizai Online (Aug. 4) notes that after the 2016 Kumamoto earthquake, Sony's Kumamoto Technology Center took 3.5 months to fully recover, and Renesas's Kawajiri plant took over a month on a wafer-input basis. This time, most major fabs restarted or returned within eight days. The analysis credits reinforced building seismic resistance, improved equipment anchoring, and more flexible chemical and gas piping for the difference — though it cautions that damage scale and epicenter location also differed between 2016 and 2026, so the comparison isn't perfectly apples-to-apples.

There was movement among adjacent suppliers too. Fujifilm Holdings announced on Aug. 3 a 50-million-yen donation to Kumamoto Prefecture, along with a 50%-off special repair program for damaged products — though it made no mention of the operating status of its Kikuyo-based semiconductor materials plant. Shin-Etsu Chemical, Resonac, Tokyo Ohka Kogyo, Hirata Corporation, and Toppan have issued no new official statements between Aug. 1 and Aug. 5, with no change from what's already been reported.

Why Did Honda Shut Plants as Far Away as Saitama and Suzuka?

In an official update on Aug. 4, Honda said that because quake-damaged suppliers can't deliver parts, it would halt four-wheel vehicle production at its Saitama plant (Aug. 5-19), Suzuka plant (Aug. 6-19), and Honda Auto Body in Yokkaichi, Mie Prefecture (Aug. 6-19). Its Kumamoto plant, which builds motorcycles, extends a halt that began the night of July 28 through Aug. 7.

What stands out is that "August 19" is a date further out than anything else that has appeared in this series so far. Where semiconductors are targeting "pre-earthquake production capacity by the end of August," automakers simply can't run their lines — no matter how much they want to — as long as parts aren't arriving. One damaged supplier in Kumamoto reaching all the way to assembly plants in distant Saitama and Mie is the logistics problem flagged in our day-seven report — "even a fixed factory can't ship if the roads aren't fixed" — showing up in a more severe form. Some reports also say the halt overlaps with an Obon holiday period from Aug. 8-16, but that's sourced from Kyodo News; Honda's official statement doesn't mention it.

What Is the Status at Toyota and Nissan?

At its Aug. 4 earnings call, Toyota said it "cannot yet see when Aisin Kyushu will be fully recovered" — referring to its parts supplier (Jiji Press, Aug. 4) — and is dispatching support staff from across the Toyota group to help. Its three Fukuoka plants remain halted through Aug. 5, per the July 31 announcement, with nothing announced for Aug. 6 onward as of Aug. 4. Its full-year global sales plan of 11.8 million units is unchanged, and quake impact isn't yet reflected in earnings guidance.

Everything reported about Nissan remains media-sourced. Jiji Press (Aug. 4) reported that Nissan plans to resume production of some models, halted at two Fukuoka plants, starting Aug. 6. Reuters (Aug. 4) reported some production running normally on Aug. 6 and 7. Nikkan Jidosha Shimbun identifies the plants as Nissan Motor Kyushu and Nissan Shatai Kyushu. The contrast is notable — Toyota says it can't see a timeline while Nissan has specific restart dates in circulation — but both pictures come from reporting, not official releases.

Why Did Home-Damage Figures Triple Overnight?

The Fire and Disaster Management Agency's 39th report (4:30 p.m., Aug. 4) put the death toll at 38, unchanged from the previous report. Injuries, however, rose to 127 (18 serious, 109 minor or other), up from 118 in the 34th report. Most striking is the count of damaged homes: 7,664 (699 totally destroyed, 1,045 half-destroyed, 5,920 partially damaged) — more than triple the 34th report's 2,292. Total destructions alone jumped from 181 to 699.

That jump doesn't mean thousands of homes suddenly collapsed overnight. A week into the earthquake, comprehensive field surveys across the disaster area have progressed, and damage that hadn't yet been captured is now reflected in the numbers — that's the accurate reading. Kumamoto Prefecture's own materials note that the figures "include estimates," a sign these are provisional counts still being finalized rather than confirmed totals. The evacuation-order population — 115,075 households and 243,097 people across three municipalities — hasn't changed much.

Kumamoto Prefecture's 14th response-headquarters meeting (2:00 p.m., Aug. 4) lists 146 shelters and 7,646 evacuees, with home damage totaling 13,393 including 5,737 not yet classified (699 totally destroyed, 20 large-scale half-destroyed, 1,025 half-destroyed, 5,912 partially damaged). The gap with the Agency's 7,664 comes down to how unclassified cases are handled, not an error on either side. Whenever these numbers are cited, it matters which agency reported them and at what time.

When Will Water Return to Yatsushiro?

Per the Ministry of Land, Infrastructure, Transport and Tourism's 27th report (4:30 p.m., Aug. 4; water figures as of 2:30 p.m.), about 44,000 households across 4 municipalities in Kumamoto Prefecture remain without water, down sharply from a peak of about 108,100. Yatsushiro City — which this series had reported as unchanged since the earthquake in every prior update — finally fell, from a peak of 25,269 households to about 24,789. Hikawa Town likewise fell, from 3,231 to about 3,136, its first decline as well. Uki City stands at about 15,575 households and Kosa Town at about 270.

The Ministry states it is "working with full effort toward resolving outages by the end of August," with 198 water trucks deployed (18 from the Ministry, 110 from the Japan Water Works Association, 70 from the Self-Defense Forces). Yatsushiro City is running phased trial water supply in its Gunchiku, Showa, and Hinagu districts, checking for leaks as it goes (Yatsushiro City official). After seven days with no movement at all, Yatsushiro's outage finally showed its first sign of progress on day eight. For more on how the loss of tap water — the feedstock for ultrapure water — has constrained fab restarts throughout this series, see our earlier reporting on fab status after the quake.

When Will Roads, Rail, and the Port Come Back?

NEXCO West Japan announced at 1:00 p.m. on Aug. 4 the first-ever timeline for general-vehicle traffic on the Kyushu Expressway's Matsubase IC-Ebino IC section and the Minami-Kyushu Expressway's Yatsushiro South IC-Tanoura IC section: "the latter half of August" (with some restrictions). No specific within-month timeline had appeared anywhere in this series before. The Miyahara SA-Sakamoto PA section is expected to open to emergency vehicles during the week of Aug. 9. The Yatsushiro JCT-Yatsushiro South IC section still has no timeline, and NEXCO West set up an expert committee on Aug. 4 to begin studying how to repair it.

On rail, the Hisatsu Orange Railway announced on Aug. 4 that its Minamata-Sendai section would resume service from the first train on Aug. 5. Its Yatsushiro-Minamata section will "resume partially in sections where recovery and safety have been confirmed," while acknowledging that "the most heavily damaged sections could see a prolonged suspension" — no longer a simple case of blanket suspension. Bus substitute service for the sections that remain closed is being prepared, targeted to begin around Aug. 10. The Kyushu Shinkansen's Kumamoto-Shin-Minamata section remains "difficult to resume within August," and the Kagoshima Main Line's Uto-Yatsushiro section is unchanged as well.

At the port, Yatsushiro Port's outer harbor district now has five usable berths, up from four the day before. But the container crane still has rail damage and an oil leak, and cargo-handling capability itself remains shut down. Ships have more room to dock, but the picture from day seven — the machine that unloads containers still can't run — hasn't changed by day eight.

What Is the State of the Government Response?

At the sixth disaster-response headquarters meeting on Aug. 4, the government approved use of 24.2 billion yen from reserve funds. Prime Minister Takaichi instructed officials to "work with full effort so that all disaster areas see water outages completely resolved by the end of August," after resolving outages progressively in early and mid-August. Fuel supply is running at four times normal levels, and about 90% of gas stations have reopened even in the previously lagging municipalities of Yatsushiro, Uki, and Hikawa. Construction-type temporary housing broke ground in Uki City and Hikawa Town on Aug. 3. The PFI vessel Hakuou II was scheduled to dock at Yatsushiro Port on Aug. 4, offering Self-Defense Force bathing, lodging, and meal support alongside medical care from JMAT — the Japan Medical Association's disaster medical assistance teams. 637 support staff have been dispatched from 35 prefectures and 17 cities nationwide.

An "extremely severe disaster" designation was announced by the Cabinet Office as "expected" on Aug. 3. If granted, it would raise the national subsidy rate for public infrastructure repair from an average of 71% to 84%, and for farmland from 86% to 97%, substantially easing the financial burden on affected municipalities. But as of Aug. 5, the formal designation order has not yet been enacted, with reports suggesting a Cabinet decision could come "as early as the 7th." A "specified non-ordinary disaster" designation — which enables special exceptions to private-rights deadlines, such as extending the window to renounce an inheritance — was also announced as expected on the same day. It would be inaccurate to say the earthquake "has been designated" an extremely severe disaster; the accurate description is that a designation is expected, with the formal order still pending.

What Risks Lie Ahead?

Typhoon No. 13 remained very strong near the Ogasawara Islands as of Aug. 4. Moist air and the typhoon's effects are expected to begin reaching Kumamoto Prefecture around Aug. 6, with the storm approaching Okinawa and the Amami region at strong intensity around Aug. 7-8. Because the storm is moving slowly, forecasters warn that strong wind and rain could persist for two to three days. For areas where emergency water response and temporary infrastructure aren't yet fully in place, prolonged bad weather is itself a risk.

Seismic activity hasn't settled either. As of 6:00 p.m. on Aug. 4, the JMA had recorded six quakes of intensity 5-lower or greater since the main shock. The agency continues to warn of caution for quakes of intensity 5-upper or greater for about the next week — aftershock risk hasn't lifted, even eight days on.

Update (August 5): What's New

At 3:01 p.m. on August 5, Nippon Paper held its first press conference since the quake over the chimney collapse at its Yatsushiro plant. President Akira Sebe said, "I would like to offer my heartfelt sympathies to everyone affected by the earthquake. I offer my deepest condolences to those who lost their lives, and I sincerely apologize for the concern this has caused so many people involved" (media-sourced; the Asahi Shimbun, Mainichi Shimbun, NHK, and TKU reported consistently). The chimney that collapsed served an oil-fired boiler, stood 80 meters tall, and had been installed in 1970; the quake snapped it near its midpoint, and it fell onto an adjacent two-story wooden building. The collapse killed 9 people — 6 Nippon Paper employees and 3 workers from partner companies — the single deadliest incident of the earthquake, and a total of three chimneys were damaged. The company plans to set up an investigation committee including outside experts to examine why the chimney collapsed, and said it "cannot yet foresee" when the plant will reopen.

Automaking saw a partial reversal. Toyota Motor Kyushu's three Fukuoka plants (Miyata, Kokura, Kanda) are reported to be resuming the day shift on August 6, and the Tahara plant in Aichi Prefecture is reported to be restarting on August 17 (with some lines following on the 31st) (media-sourced; Nikkei, August 5). Nissan Motor Kyushu and Nissan Shatai Kyushu are also reportedly expected to run normally on August 6 and 7.

Damage figures were updated in the Fire and Disaster Management Agency's 41st report (as of 2:00 p.m., Aug. 5): 38 deaths, 129 injuries, and 7,820 damaged homes (6,076 partially damaged), with the evacuation-order population down to 108,307 households and 228,736 people. Per the Ministry's 29th report (water figures as of noon that day), water outages stand at about 44,000 households across 4 municipalities in Kumamoto Prefecture, with Yatsushiro City at about 24,789 and 188 water-supply trucks deployed. At the seventh disaster-response headquarters meeting, Prime Minister Takaichi instructed officials to accelerate secondary evacuation to hotels and inns (prioritizing elderly and disabled residents), step up crime-prevention measures, address heatstroke, economy-class syndrome, and infectious disease risk, fully resolve water outages by the end of August, and stay alert to secondary disaster risk from Typhoon No. 13. Sony's third statement and Renesas's fifth statement remain unpublished as of Aug. 5, and the formal order designating the earthquake an extremely severe disaster still hasn't been enacted. Typhoon No. 13 is expected to approach Okinawa and Amami around Aug. 7-8; because it is moving slowly, its effects on Kumamoto Prefecture could be prolonged.

Key Takeaways

• Renesas's Kawajiri plant moved up its planned Aug. 5 restart by a day, resuming production on Aug. 4. Mitsubishi Electric is also restarting production line by line as equipment clears inspection. There's still no official statement confirming Sony's Kikuyo plant actually restarted on Aug. 4 as planned. TSMC Japan's official X account said on the night of Aug. 3 that JASM's Kumamoto fab was back to normal operations with a 250-million-yen donation, but TSMC itself still hasn't issued a press release — and compared with the 2016 Kumamoto earthquake (3.5 months for Sony's full recovery, over a month for Renesas), this time's eight-day turnaround stands out.
• Honda halted four-wheel vehicle production at its Saitama plant (Aug. 5-19), Suzuka plant (Aug. 6-19), and Honda Auto Body (Aug. 6-19), citing a damaged supplier's parts shortage. That plants this far from Kumamoto had to stop shows a more severe logistics breakdown than anything reported so far in this series.
• Toyota said at its earnings call that it can't yet see a timeline for Aisin Kyushu's full recovery, while Nissan is reported to be resuming some production at two Fukuoka plants on Aug. 6 (both media-sourced).
• The Fire Agency's 39th report put damaged homes at 7,664, more than triple the 34th report's count — but that reflects survey progress, not a sudden worsening of damage. Water outages in Yatsushiro City and Hikawa Town fell for the first time since the earthquake, and the government is targeting full resolution by the end of August.
• An "extremely severe disaster" designation was announced as expected on Aug. 3, but the formal order still hadn't been issued as of Aug. 5. Typhoon No. 13 is expected to approach Okinawa and Amami around Aug. 7-8, and aftershock risk remains elevated.