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Based on the existing provisions/operations of tsunami warning in the Indian Ocean, authors observed that detection as well as arrival time estimations of regional tsunami service providers (RTSPs) could be improved. In particular, the detection mechanisms have been eccentrically focussed on Sunda and Makran tsunamis, although tsunamis from Carlsberg ridge and Chagos archipelago could generate devastating tsunamis for which inadequate provisions exist for detection and arrival time/wave height estimation. RTSPs resort to assess estimated arrival time/wave heights from a scenario-based, pre-simulated database. These estimations in terms of Sri Lanka have been found inconsistent. In addition, current warning mechanism poorly manages non-seismic tsunamis. Thus, the purpose of this study is to investigate these drawbacks and attempt to carve out a series of suggestions to improve them.

The work initiated with data retrieved from global earthquake and tsunami databases, followed by an estimation of probabilities of tsunamis in the Indian Ocean with particular emphasis on Carlsberg and Chagos tsunamis. Second, probabilities of tsunami detection in each sub-region have been estimated with the use of available tide gauge and tsunami buoy data. Third, the difficulties in tsunami detection in the Indian Ocean are critically assessed with case studies, followed by recommendations to improve the detection and warning.

Probabilistic estimates show that given the occurrence of a significant earthquake, both Makran and Carlsberg/Chagos regions possess higher probabilities to harbour a tsunami than the Sunda subduction zone. Meanwhile, reliability figures of tsunami buoys have been declined from 79-92 to 68-91 per cent over the past eight years. In addition, a Chagos tsunami is left to be detected by only one tide gauge prior to it reaching Sri Lankan coasts.

The study uses an averaged tsunami speed of 882 km/h based on 2004 Asian tsunami. However, using exact bathymetric data, Tsunamis could be simulated to derive speeds and arrival times more accurately. Yet, such refinements do not change the main derivations and conclusions of this study.

Tsunami detection and warning in the Indian Ocean region have shown room for improvement, based on the inadequate detection levels for Carlesberg and Chagos tsunamis, and inconsistent warnings of regional tsunami service providers. The authors attempted to remedy these drawbacks by proposing a series of suggestions, including a deployment of a new tsunami buoy south of Maldives, revival of offline buoys, real-time tsunami simulations and a strategy to deal with landslide tsunamis, etc.

Indian Ocean is prone to mega tsunamis as witnessed in 2004. However, more than 50 per cent of people in the Indian Ocean rim countries dwell near the coast. This is verified with deaths of 227,898 people in 14 countries during the 2004 tsunami event. Thus, it is of paramount importance that sufficient detection levels are maintained throughout the Indian Ocean without being overly biased towards Sunda tsunamis. With respect to Sri Lanka, Makran, Carlesberg or Chagos tsunamis could directly hit the most populated west coast and bring about far worse repercussions than a Sunda tsunami.

This is the first instance where the threats from Carlesberg and Chagos tsunamis to Sri Lanka are discussed, probabilities of tsunamis are quantified and their detection levels assessed. In addition, reliability levels of tsunami buoys and tide gauges in the Indian Ocean are recomputed after eight years to discover that there is a drop in reliability of the buoy data. The work also proposes a unique approach to handle inconsistencies in the bulletins of regional tsunami service providers, and to uphold and improve dwindling interest on tsunami buoys.

To investigate whether or not people at risk from the 26 December 2004 tsunamis could have had better warning of the event.

This paper examines short‐term actions related to warning following the earthquake and long‐term actions related to setting up an Indian Ocean tsunami warning system prior to the disaster. The evidence is presented in the context of the long‐term processes needed to create and maintain successful warning systems.

The evidence shows that, based on the knowledge and procedures existing at the time, any expectation of effective warning prior to the tsunamis was unreasonable. On 26 December 2004, as much action was taken as feasible. Prior to the catastrophe, the Indian Ocean tsunami risks were acknowledged but no warning systems were implemented because other priorities were deemed to be higher.

This paper presents a snapshot of the complex issue of warning system development and implementation. Each national and regional case study deserves detailed attention. Further work would add to a more complete understanding of conditions before 26 December 2004.

This case study provides a reminder that planning for warnings must be done before extreme events, not following them. Successful warning systems require investment in a long‐term, ongoing process involving pre‐event planning, education, and awareness.

This paper provides an initial attempt at evaluating Indian Ocean tsunami warnings on 26 December 2004.

This paper aims to provide a general overview of the international Tsunami warning system mandated by the United Nations, particularly on cataloging past studies and a strategic focus in the Indian Ocean, particularly on the Bay of Bengal region.

Present research assimilates the secondary non-classified data on the Tsunami warning system installed in the Indian Ocean. Qualitative review and exploratory research methodology have been followed to provide a holistic profile of the Tsunami rarly warning system (TEWS) and its role in coastal resilience.

The study finds the need for strategic focus to expand and interlink regional early warning cooperation mechanisms and partnerships to enhance capacities through cooperation and international assistance and mobilize resources necessary to maintain the TEWS in the Indian Ocean region. The enhanced capacity of the TEWS certainly improves the resilience of Indian Ocean coastal communities and infrastructures.

The study is original research and useful for policy planning and regional cooperation on data interlinkages for effective TEWS in the Indian Ocean region.

The purpose of this paper is to present an assessment of the potential tsunamigenic seismic hazard to Sri Lanka from all active subduction zones in the Indian Ocean Basin.

The assessment was based on previous studies as well as past seismicity of the subducion zones concerned.

Accordingly, four seismic zones capable of generating teletsunamis that could reach Sri Lanka have been identified, namely, Northern Andaman‐Myanmar, Northern Sumatra‐Andaman and Southern Sumatra in the Sunda trench and Makran in the Northern Arabian Sea. Moreover, plausible worst‐case earthquake scenarios and respective fault parameters for each of these seismic zones have been recommended.

However, other potential tsunami sources such as seismic activity in the near‐field, submarine landslides and volcanic eruptions have not been considered.

Numerical simulations of tsunami propagation have been carried out for each of the four scenarios in order to assess the potential impact along the coastline of Sri Lanka. Such information relating to the spatial distribution of the likely tsunami amplitudes and arrival times for Sri Lanka would help authorities responsible for evacuation to make a better judgment as to the level of threat in different areas along the coastline, and act accordingly, if a large earthquake were to occur in any of the subduction zones in the Indian Ocean.

In the absence of comprehensive probabilistic assessments of the tsunami hazard to Sri Lanka, this paper's recommendations would provide the necessary framework for the development of deterministic tsunami hazard maps for the shoreline of Sri Lanka.

This paper aims to describe a multi-scenario assessment of the seismogenic tsunami hazard for Bangladesh from active subduction zones in the Indian Ocean region. Two segments of the Sunda arc, namely, Andaman and Arakan, appear to pose a tsunamigenic seismic threat to Bangladesh.

High-resolution numerical simulations of tsunami propagation toward the coast of Bangladesh have been carried out for eight plausible seismic scenarios in Andaman and Arakan subduction zones. The numerical results have been analyzed to obtain the spatial variation of the maximum tsunami amplitudes as well as tsunami arrival times for the entire coastline of Bangladesh.

The results suggest that the tsunami heights are amplified on either side of the axis of the submarine canyon which approaches the nearshore sea off Barisal in the seaboard off Sundarban–Barisal–Sandwip. Moreover, the computed tsunami amplitudes are comparatively higher north of the latitude 21.5o in the Teknaf–Chittagong coastline. The calculated arrival times indicate that the tsunami waves reach the western half of the Sundarban–Barisal–Sandwip coastline sooner, while shallow water off the eastern half results in a longer arrival time for that part of the coastline, in the event of an earthquake in the Andaman seismic zone. On the other hand, most parts of the Chittagong–Teknaf coastline would receive tsunami waves almost immediately after an earthquake in the northern segment of the Arakan seismic zone.

The present assessment includes probabilistic measures of the tsunami hazard by incorporating several probable seismic scenarios corresponding to recurrence intervals ranging from 25 years to over 1,000 years.

This paper seeks to provide a timely consideration of how regional governments in Asia and other national governments around the world collect, manage, and share critical geo‐technical information in what is becoming an increasingly global community.

The paper addresses the socio‐technical perspective of government information systems and management, and draws on the collection and analysis of several public reports, media articles, and expert opinions published in the aftermath of the Asian tsunami of 26 December 2004.

On the basis of the published material, the paper observes how critical early warning information was handled by government authorities in the hours before the tsunami wave strike, discusses the availability of technological solutions that can provide earthquake and tsunami warning information, and poses that government bureaucracies and human relations form the weakest link in the information chain.

The paper concludes with a potential research agenda for government warning information systems and management.

The type of early warning information system that might be created to avoid another loss of life, suggested improvements to inter‐government information sharing and communications, and the emerging requirement for earthquake and tsunami information dissemination and education in lesser developed countries are also discussed.

The research enabled the examination of weaknesses in critical information sharing between governments and members of the international community, and highlights the issue of strong human relationships as a key to preventing the loss of life and better managing disasters.

The purpose of this paper is to explore the societal impacts and consequences of the December 26, 2004 Indian Ocean tsunami.

One month after the tsunami, a group of social science researchers from the Disaster Research Center, University of Delaware, and the Emergency Administration and Planning Program, University of North Texas, participated in an Earthquake Engineering Research Institute reconnaissance team, which traveled to some of the most affected areas in India and Sri Lanka. Data were obtained through informal interviews, participant observation, and systematic document gathering.

This research yielded important data and information on disaster preparedness, response, and recovery. A number of issues are identified that emerged from the field observations, including: tsunami education and awareness; the devastation and the loss; economic impact; mental health issues; irregularities and inequities in community based response and recovery efforts and in the distribution of disaster relief aid; gender and inequality; and relocation and housing issues.

The paper highlights the role and importance of generating integrated early warning systems and strategies aimed at fostering sustainable recovery and building disaster resilient communities.

An extensive amount of perishable data were collected thus providing a better understanding of the societal impacts of disasters on impoverished communities. A number of emerging issues are identified that should be of primary concern in efforts to protect populations residing in coastal regions throughout the world from similar catastrophes.

To highlight the failure of the tsunami early warning system and the challenges of successfully responding to, and managing a transnational catastrophe of this nature. The paper also highlights unique challenges in the management of this catastrophe and suggests potential strategies for good disaster response and management in this response and beyond.

Primary data collection was by telephone interviews with experts in the South and South‐East Asian region, supplemented by a comprehensive literature review of scholarly journals, reports from relief agencies and United Nations situation reports and bulletins amongst others. The scope of the paper is limited to the issue of a warning not been passed onto appropriate authorities in the region, the unique challenges of the relief response and the rehabilitation and reconstruction of the affected communities.

From the study, there is a need for further investigation into the catastrophic warning failure; as reasons proffered by the early warning officials for their inability to pass on a warning to authorities in the affected area appear weak at this stage. The study also found unique geographical, political, economic and social challenges facing the international relief and reconstruction effort. Specifically some of the challenges include the management of the media and information, logistics and coordination, needs and damage assessment, donations and safety and security issues amongst others. In summary, the author found that there is also a need for foreign assistance agencies to be seen to be fair, to build trust and ownership of relief and reconstruction efforts amongst the local populace, as well as use local people as much as possible.

The study was conducted only 21 days (three weeks) after the tsunami catastrophe of 26 December 2004, hence it is a snapshot of events in the days immediately after the catastrophe. The relief action is an on‐going event and there may be changes as new information emerges from the field.

A world wide network of integrated submarine earthquake and tsunami monitoring and early warning system should be set up. Critical warning information in any potential disaster should be shared as inclusively as possible. Relief workers must be seen to be politically and religiously neutral, especially in the civil conflicts of Banda Aceh Indonesia. Finally relief and aid should be given on the basis of sound humanitarian principles such as need, not just on wider economic criteria.

The study highlights specific potential challenges which relief organisations must deal with in responding effectively to the disaster, and in assisting to reconstruct the region. The paper proffers specific strategies for effective management of the international assistance effort. Finally, the study adds to the literature on developing countries and is valuable for governments, emergency and relief workers, policy makers in both developed and developing countries.

This chapter introduces the tourism–disaster–conflict nexus through a comprehensive review of the contemporary social science literature. After reviewing conceptual definitions of tourism, disaster and conflict, the chapter explores various axes that link through this nexus. The linkages between tourism and disaster include tourism as a trigger or amplifier of disasters, the impacts of disasters on the tourism industry, tourism as a driver of disaster recovery and disaster risk reduction strategies in the tourism sector. Linkages between tourism and conflict include the idea that tourism can be a force for peace and stability, the niche status of danger zone or dark heritage tourism, the concept of phoenix tourism in post-conflict destination rebranding, tourism and cultural conflicts, and tourism’s conflicts over land and resources. Linkages between disaster and conflict include disasters as triggers or intensifiers of civil conflict, disaster diplomacy and conflict resolution, disaster capitalism, and gender-based violence and intra-household conflict in the wake of disasters. These are some of the conversations that organise this volume, and this introductory chapter ends with a summary of the chapters that follow.