An old rusty tsunami warning sign in Bali Indonesia. After the tsunami, countries in Asia have improved their early warning system and signs to save lives. Credit: Unsplash/Bernard Hermant

By Temily Baker and Sofia Bilmes
BANGKOK, Thailand, Mar 11 2026 (IPS)

On 11 March 2011, the powerful 9.0 magnitude Tōhoku 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 Bōsai 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 Tōhoku 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.

Source: International Tsunami Information Center (ITIC)

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 Tōhoku 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.

Temily Baker is Programme Management Officer, Disaster Risk Reduction Section, ESCAP and Sofia Bilmes is Intern, Disaster Risk Reduction Section, ESCAP

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An official explained the role of Indian National Centre on Ocean Information Services (INCOIS) as a regional tsunami service provider for the Indian Ocean Tsunami Warning and Mitigation System (IOTWMS). Credit: ESCAP/Nattabhon Narongkachavana
 
The World Tsunami Awareness Day is commemorated annually on November 5.

By Temily Baker and Michel Katrib
BANGKOK Thailand, Nov 4 2025 (IPS)

On a quiet July morning in Severo-Kurilsk, a coastal town in the East of the Russian Federation, the sea began to retreat unnaturally fast. Within minutes, tsunami sirens blared and 2,700 residents evacuated to higher ground. Waves up to five meters inundated the port and fish factory, but no lives were lost. The town’s survival reflected years of investment in early warning systems, community drills, and resilient infrastructure. The 2025 Kamchatka tsunami demonstrated what preparedness can achieve when science, governance, and community action align.

These efforts build on a broader regional commitment. The functioning Indian Ocean Tsunami Warning and Mitigation System (IOTWMS) and the Pacific Tsunami Warning and Mitigation System (PTWS) have enabled real-time seismic and sea-level monitoring, coordinated drills, the expansion of tsunami service providers, and integration of tsunami preparedness into national disaster management frameworks across 46 ESCAP coastal countries.

As we mark World Tsunami Awareness Day under the theme “Be Tsunami Ready: Invest in Tsunami Preparedness”, this achievement reminds us that resilience is possible, but only with persistent and consistent investments and cooperation.

A shared oceanic challenge

Tsunamis remain one of the most devastating natural hazards, capable of wiping out entire communities in minutes. In the Indian Ocean, over 20 million people across 13 ESCAP member countries live in tsunami-exposed zones. In the Pacific, where 70 per cent of all recorded tsunamis have occurred, Small Island Developing States face existential risks even from moderate events.

However, tsunami risk is rarely isolated. It is compounded by coastal flooding, cyclones, landslides, and volcanic eruptions, risk now intensified by climate change. Rising sea levels reduce evacuation time and increase the reach of tsunami inundation. In the Pacific, a 50cm rise in sea level could expand tsunami flooding areas by up to 30 per cent, while in the Indian Ocean, urban centers such as Jakarta, Chennai and Colombo face cascading threats from cyclones, floods and tsunamis.

This interconnected hazard landscape demands integrated solutions. Tsunami preparedness must be embedded within broader multi-hazard frameworks, urban planning and climate adaptation strategies.

A regional effort and a new standard for measuring preparedness

Across both oceans, countries are conducting tsunami capacity assessments using a standardized, regionally endorsed methodology developed with UNESCO’s Intergovernmental Oceanographic Commission (IOC) and supported by the Trust Fund for Tsunami, Disaster and Climate Preparedness.

Far more than technical exercises, they reflect two decades of progress since the 2004 Indian Ocean tsunami—highlighting remaining vulnerabilities and galvanizing political commitment. The push for a unified approach stems from the need to celebrate achievements, strengthen preparedness, and enable countries to evaluate their capacities across six key pillars: risk knowledge, monitoring and forecasting, warning dissemination, preparedness and response, governance and financing.

Figure 1: Map of Indian and Pacific Ocean tsunami warning systems, and country participation in the Tsunami Preparedness capacity assessments 2024-2025 (Source: ESCAP).

Bridging the gaps: Priorities for investment

Despite progress, the assessments revealed persistent gaps that must be addressed to ensure every community is tsunami ready:

1. Sustain national operations: Expand monitoring infrastructure in underserved coastal areas and ensure 24/7 operational readiness in all National Tsunami Warning Centres, through public financing and investments in human resources.

2. Strengthen risk knowledge and community awareness: Only 18 per cent of Indian Ocean countries and 31 per cent of Pacific countries, that completed the assessment, conduct hazard assessments at the community level. Public access to hazard maps, evacuation plans and culturally relevant education materials must be improved.

3. Enhance warning dissemination and communication: Whilst significant advances have been made on internet connectivity, multi-channel communication networks and infrastructure upgrades, only 32 per cent of countries in the Indian Ocean basin have robust warning dissemination infrastructure such as satellite phones and VSAT systems communication infrastructure to reach remote communities. The Pacific Ocean faces similar problems with reaching remote island communities where local communication infrastructure is limited.

4. Empower community-led preparedness initiatives: Invest in inclusive, locally driven tsunami preparedness efforts. Support communities to develop evacuation plans, conduct drills and integrate traditional knowledge with scientific risk assessments. The UNESCO-IOC Tsunami Ready Programme offers a valuable framework to build awareness, strengthen local leadership, and foster ownership of preparedness actions to ensure that early warnings translate into life-saving action.

5. Mobilize multi-hazard financing: Global, regional and national cooperation has proven essential to share resources, data, and knowledge for effective tsunami and multi-hazard preparedness. Yet only 32 per cent of countries have actionable plans based on tsunami risk assessments. Investment gaps should be filled to accelerate progress on community preparedness, through private sector engagement and integration of efforts with a multi-hazard approach.

The ocean connects us, but it also challenges us. Tsunamis cross borders, and so must our preparedness. The 2025 Kamchatka tsunami showed that lives are saved when communities are empowered, systems are in place, and warnings are heeded. Resilience is more than a goal, it is a choice we must make together.

Temily Baker is Programme Management Officer, Disaster Risk Reduction Section, ESCAP; Michel Katrib is Intern, Disaster Risk Reduction Section, ESCAP

SDGs: 11, 14, 17

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Credit: Pexels/Guduru Ajay bhargav

By Temily Baker and Juliette de Charry
BANGKOK, Thailand, Nov 24 2023 (IPS)

Between 1970 and 2022, disaster events in Asia and the Pacific caused 2.04 million deaths and $2.71 trillion in economic damages. ESCAP estimates that among these totals, tsunamis rank as the third deadliest hazard, accounting for 12% of fatalities, and the fourth most economically destructive hazard, comprising 11 per cent of economic damages.

Tsunamis, despite their infrequent occurrence, cause significant damage, with 260,000 fatalities from 58 tsunamis in the last century, averaging 4,600 deaths per event. Vulnerable populations, including women, children, persons with disabilities, and the older persons, are disproportionately affected.

For example, in the 2004 Indian Ocean tsunami, around 70 per cent of fatalities were women, whereas in the 2011 Great East Japan earthquake and tsunami, 64.4 per cent of the victims were older individuals.

By 2030, around half of the global population will reside in coastal areas vulnerable to floods, storms, and tsunamis. Given the ongoing impact of climate change the need for proactive measures to mitigate these coastal risks is becoming more apparent.

Since natural hazards do not follow national boundaries, regional cooperation plays a critical role in tsunami warnings in the Asia-Pacific region.

Regional commitment, catalysed by the devastating 2004 Indian Ocean tsunami, has led to significant improvements in multi-hazard coastal preparedness across the Indian Ocean basin. In 2005, a ground-breaking grant of US$10 million from the Government of Thailand established the ESCAP Multi-Donor Trust Fund for Tsunami, Disaster and Climate Preparedness.

The Trust Fund represents a regional commitment to strengthening early warning systems and the current membership of Italy, Switzerland, India, and Japan with Thailand are evidence of how triangular and south-south cooperation can be mutually supportive.

As a result, 19 countries have directly benefitted through building regional and national end-to-end warning systems for coastal hazards.

The Trust Fund played a vital role in creating the Indian Ocean Tsunami Warning and Mitigation System (IOTWMS), which became operational in October 2011, with Australia, India, and Indonesia as regional service providers. With an initial investment of US$300 million, this system supports 36 countries in the Indian Ocean basin.

These nations now share a Probabilistic Tsunami Hazard Assessment, recently updated to include the Makran Subduction Zone in the North-West Indian Ocean. To ensure sustainability, the IOTWMS promotes a multi-hazard approach and encourages governments to formalize financial commitments through legal frameworks and long-term policies. A 2015 ESCAP study estimated that the IOTWMS will save at least 1,000 lives annually over the next century.

Figure 1: Existing services of the Global Tsunami Warning System.

Source: UNESCO-IOC (The boundaries and names shown and the designations used on this map do not imply official endorsement or acceptance by the United Nations. )

In May 2023, ESCAP reaffirmed its regional commitment to advance early warning systems, including those for tsunamis. They also resolved to accelerate climate action for sustainable development and mandated the development of regional early warning systems (E/ESCAP/RES/79/1).

ESCAP recognized the Trust Fund for Tsunami, Disaster, and Climate Preparedness as a crucial funding mechanism to support these efforts across the region (ESCAP/CDR(8)/6).

Advancing tsunami warnings for all

This year’s World Tsunami Awareness Day (WTAD) on 5 November was dedicated to addressing inequality for a more resilient future and focused on raising awareness about the factors that make tsunamis more deadly for the most vulnerable populations.

The theme was aligned with the “Early Warnings for All” global initiative, which aims to provide early warning systems to everyone on Earth by 2027, and Target G of the Sendai Framework, which promotes the expansion of early warnings and early actions for all.

Building on the momentum of the Early Warnings for All initiative, it’s crucial to ensure that efforts to improve early warning systems for climate-related hazards also include those of seismic origin, such as tsunamis.

Through generous contributions to the Trust Fund for Tsunami, Disaster and Climate Preparedness, UNESCO-IOC and ESCAP have now initiated a comprehensive assessment of tsunami preparedness capacity in the Indian and Pacific Ocean basins.

This assessment will use a standardized methodology based on the 2018 capacity assessment Indian Ocean tsunami preparedness. It will evaluate progress made since the 2004 Indian Ocean Tsunami and provide regional decision-makers with insights into the additional requirements for tsunami preparedness, both technically and in terms of policy.

Tsunamis should be treated as multifaceted threats that not only endanger lives but also disrupt livelihoods, industry, agriculture, gender equality, and critical services like education and healthcare.

Access to high-quality and readily information is crucial for supporting regional mechanisms and local preparedness while also increasing awareness of early warning systems.

For more information on World Tsunami Awareness Day, visit: https://tsunamiday.undrr.org/

For more information on the Trust Fund for Tsunami, Disaster and Climate Preparedness, visit: https://www.unescap.org/disaster-preparedness-fund

For more information on the IOTWMS, visit: http://www.ioc-tsunami.org/index.php?option=com_content&view=article&id=8&Itemid=13&lang=en

Temily Baker is Programme Management Officer. ESCAP; Juliette de Charry Intern, ICT and Disaster Risk Reduction Division, ESCAP

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