A magnitude 7.1 earthquake struck Japan's Kumamoto region at 4:27 p.m. Japan Standard Time on July 28, damaging an Aeon Mall and a paper mill. Rescue teams searched collapsed structures as early casualty and missing-person counts changed, while a tsunami advisory was lifted within two hours.

The Japan Meteorological Agency placed the earthquake at a depth of 16 kilometers and listed its magnitude as 7.1; its detailed analysis also gave a moment magnitude of 6.8. The two values describe different magnitude calculations and should not be read as competing casualty or damage estimates.

Mall floor collapsed during the emergency

The second floor of the Aeon Mall in Kashima, Kumamoto Prefecture, collapsed and trapped people inside. The Associated Press reported that four people were pulled out with injuries and that the Kumamoto prefectural emergency response team initially listed 10 others as unaccounted for.

Other early reports cited a higher range of missing workers, showing how quickly the first figures were changing. APPI News could not verify the reported range of 20 to 30 workers through a published official statement, so that range is not used as a confirmed count here.

Japan's public broadcaster NHK reported that an explosion believed to have been caused by a gas leak preceded the collapse, according to the AP account. That was an early explanation rather than a final investigative finding on the sequence of the leak, explosion and structural failure.

Factory damage widened the rescue operation

The earthquake also brought down a chimney at a Nippon Paper Industries plant in Yatsushiro. The AP reported that 11 people were trapped under debris there and that two were later found without vital signs, while the condition of the others was initially unknown.

Damage extended beyond the two rescue sites. Early reports described damaged roads and bridges, fires, power outages and a derailed train, while bullet trains and local rail services were suspended for safety checks and Aso Kumamoto Airport closed its runway.

A Kyushu Shinkansen train standing at a station platform (illustrative image)
Rail services in Kyushu were suspended for safety checks after the earthquake. (Illustrative image) Photo by Antonio Fadel on Unsplash

Tsunami advisory lifted within two hours

Japan's weather agency issued a tsunami advisory for the Ariake and Yatsushiro seas along western Kumamoto and neighboring prefectures. The AP reported that the advisory was lifted within two hours.

The Japan Meteorological Agency's event record shows a maximum seismic intensity of 7, the top of Japan's 10-step intensity scale, for the magnitude 7.1 earthquake. Seismic intensity describes the strength of shaking at a location and is separate from magnitude, which describes the earthquake's overall size.

Government mobilized national response

Prime Minister Sanae Takaichi said Japan's government had received reports of injuries, building damage, blackouts and fires. The Defense Ministry sent aircraft to assess the affected area, and Japan's Self-Defense Forces joined the response as local teams continued rescue work.

The first missing-person and casualty counts were provisional and changed as rescuers reached damaged sites. Any later total should be tied to a publication time and a named Japanese authority rather than compared directly with the initial reports.

Frequently asked questions

How strong was the Kumamoto earthquake?
Japan's weather agency recorded magnitude 7.1 and a maximum seismic intensity of 7. Its detailed analysis also listed a moment magnitude of 6.8, reflecting a different measurement method.

What happened at the Aeon Mall?
The second floor collapsed, trapping people. Early reporting also described a suspected gas leak and explosion, but the reports reviewed did not include a final investigation establishing the full sequence.

Was there a tsunami?
Japan's weather agency issued an advisory for the Ariake and Yatsushiro seas, then lifted it within two hours. The AP report did not describe a damaging tsunami.

How many people were missing?
Early counts varied. The Kumamoto prefectural emergency response team initially listed 10 people as unaccounted for at the mall, while a higher range appeared in other reporting but could not be verified through a published official statement.