On 11 March 2011, the powerful 9.0 magnitude T?hoku earthquake struck off the northeastern coast of Japan, triggering a 40-meter Tsunami. Many coastal towns along Japan’s Pacific coast were devastated. Approximately 20,000 people lost their lives and around 470,000 were evacuated from their homes. Beyond the immense human tragedy, the estimated economic losses ranged between US$154 billion to US$235 billion with severely damaged critical infrastructure, including transportation, energy systems, water supply and communications networks. The cascading impacts led to the Fukushima Daiichi Nuclear Power Plant accident, which intensified both hardship and environmental challenges.

Despite the devastation, the world witnessed extraordinary resilience

15 years later, we continue to honour those lost and the communities that were forever changed. Families rebuilt their homes, local governments restored services and the country prioritized recovery and disaster prevention. These experiences taught important lessons that have influenced global approaches to disaster risk reduction:

1. Early warning must be paired with community preparedness.
   Japan’s rapid early warning alerts in 2011 gave people precious seconds and minutes to act. What truly saved lives, however, was the country’s? deeply rooted B?sai Bunka - a culture of preparedness built on regular drills, community networks and shared responsibility. The event also showed that preparedness cannot remain static; systems, training and risk assumptions must continually evolve as science advances and hazards intensify.

2. Recovery should build long-term resilience, not just restore what was lost.
   The scale of destruction forced communities and policymakers to rethink land use, coastal defenses, urban planning and future-oriented disaster response and recovery strategies. The idea of “Build Back Better” became a key part of rebuilding after the disaster. Reconstruction became an opportunity to reduce exposure, strengthen protective infrastructure, and re?design communities with resilience at their core.

3. Disaster risks cross borders and so must our solutions.
   Tsunami waves travel across oceans and supply chains which link economies around the world. Furthermore, climate change does not know boundaries. The T?hoku disaster underscored that no country can face such risks alone. Now 61 years in operation, the Pacific Tsunami Warning System represents multilateral early warning system in the world (see Figure 1). International cooperation, shared data and coordinated preparedness are essential to reducing global disaster risk.

Together, these lessons highlight Japan as a global leader in tsunami preparedness and multi?hazard risk management, strengthened by its longstanding commitment to sharing knowledge worldwide.

Scaling Japan’s preparedness culture globally

The lessons of T?hoku earthquake and tsunami played a significant role in shaping the Sendai Framework for Disaster Risk Reduction 2015-2030, later reinforced in Asia and the Pacific through ESCAP Resolution 71/12 on strengthening regional mechanisms for its implementation. This framework helped move the world’s focus from reacting to disasters to managing risks before they happen. Since then, the culture of preparedness has grown to focus more on inclusion, better risk communication and solutions led by local communities, with 131 countries now reporting having national disaster risk reduction strategies in place. 

Moreover, Sustainable Development Goal 11 calls for making cities inclusive, safe, resilient and sustainable, and specifically, target 11.5 aims to reduce disaster-related deaths and economic losses. Unfortunately, Asia and the Pacific represent the most disaster impacted region in the world, with rising losses from disasters recorded in the 2026 SDG Progress Report.

However, hope prevails: Japan's post-2011 approach to reconstruction is an example of SDG 11 in practice: risk-informed urban planning, stricter building codes, ecosystem-based coastal protection, and community-based emergency preparedness. Today, 81 per cent of Pacific Ocean basin countries now have tsunami hazard assessments – the first step to understanding and preparing for the risk. This proves that, even though hazard events are inevitable, we can take measures to ensure they do not become disasters.

Japan's commitment to transboundary resilience building is also evident through the country’s longstanding membership within the ESCAP multi-donor Trust Fund for Tsunami, Disaster and Climate Preparedness. Through this regional funding mechanism, Japan and fellow donors from the region and worldwide translate accumulated experience into practical cooperation – reinforcing systems that enable early hazard detection, faster community notification, and the saving of lives. Most recently, the Trust Fund has supported a comprehensive tsunami preparedness capacity assessment across the region, helping countries identify gaps in early warning, coordination and last-mile communication to strengthen basin-wide resilience.

In an era of intensifying climate risks and cascading crises, remembrance must be reinforced by collective actions.