A powerful earthquake hit the Kumamoto area of southern Japan on July 28, 2026, at 4:27 in the afternoon. At least 13 people died and dozens more were hurt across a wide part of western Japan. The Japan Meteorological Agency (JMA) — the government office that tracks weather and natural disasters — officially named it the "2026 Kumamoto Earthquake" and gave it the ID number 20260728163528 (JMA).

The earthquake started about 10 to 16 kilometers below the ground, which is relatively shallow. Shallow quakes tend to cause more damage because the shaking doesn't have far to travel before reaching buildings and people. The shaking was strong enough to be felt across a large part of Japan, from the island of Kyushu all the way up to the Hokuriku region. In Kumamoto, tall buildings swayed dangerously — the JMA recorded the second-highest level on its scale for this kind of slow, rolling motion (JMA overview PDF).

Prime Minister Sanae Takaichi announced that 13 people had died (The Hindu; CNN). Reuters reported that two women in their 20s were killed in an explosion at AEON Mall Kumamoto in Kashima Town, and another person died when a building collapsed. Several people were missing, and dozens were treated at hospitals for injuries (Reuters). NHK, Japan's public broadcaster, confirmed two deaths at the mall and said rescue teams searched through the night (NHK World.

The explosion at the mall seems to have been caused by a gas leak — when earthquake shaking breaks gas pipes, the leaking gas can ignite and explode. A separate gas-leak explosion happened elsewhere in Kumamoto, and that area was cordoned off on July 29 (Kyodo News). Kyodo News, a Japanese news agency, sent out an automatic earthquake alert right after the quake and initially reported one death with dozens feared injured (Kyodo News). That number rose as rescue teams reached more people.

Two aftershocks — smaller earthquakes that happen after the main one as the ground settles — followed within the first hour. The first was a magnitude 4.8 at 4:29 p.m., and the second came at 5:08 p.m. Both were centered in the Kumamoto region (JMA). Damage also spread beyond the area closest to the quake. A highway in Yatsushiro, Kumamoto, was cracked by the shifting ground (Kyodo News).

Kyodo News reported that the earthquake likely came from a fault line (a crack in the Earth's crust where blocks of rock move) that had been left under stress after a devastating pair of earthquakes hit Kumamoto in 2016. You can think of a fault system like a crack in a windshield: when one part gives way, the pressure shifts to the next section. The segment that broke on July 28 had not ruptured during the 2016 quakes but had been carrying extra stress since then (Kyodo News).

On July 29, officials warned rescue workers and people cleaning up to take regular breaks because of extreme heat. This is a second danger on top of the earthquake — high temperatures make rescue work harder and raise the risk of heat exhaustion for both survivors and responders (NHK World.

The broader context here is that Japan sits on top of some of the most active earthquake zones in the world, and the Kyushu region has been hit repeatedly. The July 28 quake came about ten years after the 2016 Kumamoto earthquakes, which killed 50 people. The fact that a fault segment broke now, years later, worries scientists because it suggests other nearby fault segments may still be under stress and could rupture in the future. The gas explosions at the mall and elsewhere show a problem Japan has faced before: earthquake shaking breaking gas pipes in buildings. Japan's early-warning system — which sends alerts to phones and TV screens seconds before strong shaking arrives — did activate, along with Kyodo's automatic news alerts. But when an earthquake is shallow and powerful enough, even the best warning system can only do so much. The key question now is whether the aftershocks will gradually taper off as expected, or whether they signal that stress is moving to another fault segment. Japanese scientists are watching closely, because in 2016 a smaller earthquake came first — and then a bigger one followed just 28 hours later.