Three people died after an explosion damaged the Aeon Mall Kumamoto in Kajima-cho on Tuesday [2].
The incident highlights the secondary dangers of seismic events, where structural damage to utility lines can lead to lethal gas leaks and blasts after the initial shaking stops.
The earthquake struck on July 28, 2026, recording a maximum seismic intensity of Shindo 7 [1]. A female employee in her 20s said the impact was so powerful she could not track how many seconds the shaking lasted, describing the motion as a rolling wave [2]. During the tremor, she said she held onto a counter table with one hand while using her other arm to protect a customer [2].
Approximately 1.5 hours after the earthquake, a loud explosion occurred within the mall [1]. The employee said the sound was louder than thunder and was accompanied by a sudden cloud of dust [2]. Government officials said the blast was caused by an LP-gas leak that filled the building after the earthquake damaged the mall's equipment [1].
The explosion killed three people, including two women in their 20s [2]. Additionally, three people remain missing [3]. The blast destroyed a portion of the shopping center, creating a hazardous environment for shoppers, and staff who had remained in the building after the initial quake.
Emergency responders worked to secure the site in Kajima-cho as investigators looked into the failure of the gas equipment. The employee's account was broadcast on Wednesday, providing a first-hand look at the chaos that followed the seismic activity [2].
“The impact was so powerful she could not track how many seconds the shaking lasted.”
This event underscores the critical window of risk following a major earthquake. While building codes in Japan are designed to prevent collapse during Shindo 7 tremors, the subsequent 90-minute delay before the explosion suggests that gas leaks can accumulate unnoticed in large commercial spaces, turning a survivable earthquake into a mass-casualty event.
