SAKIGAKE管理人 On March 20, 2005, the Fukuoka Prefecture Western Offshore Earthquake struck suddenly, registering a magnitude of 7.0 and a maximum seismic intensity of upper 6 on the Japanese scale.
This unexpected disaster shocked the Fukuoka metropolitan area, which had long been considered a low-risk zone for earthquakes.
Today, on the 20th anniversary of the event, we at SAKIGAKE JAPAN are taking the opportunity to reflect on earthquake risk—particularly the hidden dangers posed by walls in densely built urban areas.
One Fatality, One Warning — The Danger of Collapsing Walls
The earthquake claimed one life: a person who was crushed by a collapsing block wall.
This is not an isolated incident. The collapse of exterior walls and falling debris from high-rise buildings are recurring and serious risks in urban earthquakes.
In cities like Fukuoka, the potential threats include:
- Falling glass and wall fragments causing injury or death to pedestrians
- Block walls toppling and blocking roads or evacuation routes
- Structural failure of older masonry buildings (brick and concrete block)
- Transportation paralysis and a surge in people unable to return home
Japan’s Most Dangerous Fault Line? The Kego Fault
The source of the quake—the Kego Fault Zone running through Fukuoka—is classified as an S-rank active fault, the highest risk category in Japan.
If a quake were to occur along its southeastern segment, which passes through central Fukuoka, experts estimate the death toll could exceed 1,000.
- Estimated probability of occurrence within 30 years: 0.3–6%
While this percentage may seem low, it’s worth remembering that the 2016 Kumamoto Earthquakes, which included two magnitude 7 events, had an estimated probability of just 0–0.9%.
In short: it’s not a question of if, but when. Preparedness must be rooted in reality—not false reassurance.
Strengthening Walls with a Simple Solution — The Potential of Aster Power Coating
At SAKIGAKE JAPAN, we are working with our partner ASTER CO. LTD. to promote the use of Aster Power Coating, a next-generation seismic reinforcement technology designed to reduce the risks posed by urban walls.
This innovative coating is especially effective for masonry structures such as brick or block walls, transforming fragile surfaces into earthquake-resistant barriers.
In 2022, Aster conducted a joint verification test with JICA and the Philippine government.
With an estimated 800,000 classrooms in need of seismic upgrades, this technology is now under consideration as a low-cost, high-impact solution for public safety.
🧱 Key Features of Aster Power Coating
- Water-based, high-elasticity coating that bonds tightly to masonry and concrete
- Proven to withstand magnitude 7 earthquake conditions in Japan’s largest seismic test facility
- Gaining attention globally, including Southeast Asia and Europe
- Easy-to-apply with no need for major renovations — ideal for retrofitting aging structures
▶ View the Product Page: Aster Power Coating｜Seismic-Resistant Coating
Transforming Ordinary Walls into Shields that Save Lives
Two decades have passed since the Fukuoka earthquake—but the lessons remain relevant.
In an urban disaster, walls and glass facades above us can become lethal hazards.
Choosing Aster Power Coating during routine exterior maintenance offers more than aesthetic value—it adds a layer of seismic protection that can save lives.
Disaster preparedness should not be seen as an extra cost, but rather an investment in everyday safety.
This approach is part of the growing “Phase-Free” concept—integrating emergency preparedness into daily life.
At SAKIGAKE JAPAN, we are committed to building resilience through disaster consulting, business continuity planning (BCP), and solutions like Aster Power Coating that offer practical, scalable protection.