International Tsunami Survey Team

International Tsunami Survey Team
Name	International Tsunami Survey Team
Formation	2004
Type	Scientific consortium
Headquarters	Variable (field-deployed)
Region served	Global
Fields	Tsunami science, seismology, coastal engineering, oceanography

International Tsunami Survey Team The International Tsunami Survey Team is a multinational consortium of researchers and practitioners that conducts post-tsunami reconnaissance, data collection, and analysis to improve hazard assessment and mitigation. Founded in response to the 2004 2004 Indian Ocean tsunami, the Team has repeatedly mobilized after major events to document inundation, damage, and geomorphic change, linking field observations to models developed by institutions such as USGS, NOAA, JAMSTEC, NIOT, GNS Science and Geoscience Australia. Its work informs policy and engineering practice used by agencies including UNESCO, IFRC, WMO, IUGG, and IOC.

History and formation

The concept for coordinated multinational post-tsunami surveys emerged following the 2004 disaster that affected Sumatra, Sri Lanka, Thailand, India, and other states, when researchers from University of Tokyo, Columbia University, University of Washington, Monash University, National Institute of Oceanography (India), and University of Canterbury pooled expertise. Early field teams were organized under ad hoc leadership from PMEL, USGS, and regional research centers such as NIED and AGSO; these interactions subsequently matured into a standing international framework. Later activations followed the 2010 Chile earthquake, 2011 Tohoku tsunami, 2018 Sulawesi tsunami, and 2022 Hunga Tonga tsunami, with participation from networks associated with UNDRR and regional tsunami warning centers like the Pacific Tsunami Warning Center.

Mission and objectives

The Team’s core mission is to document tsunami impacts to support hazard reduction through applied science, bridging research from seismology, geomorphology, structural engineering, hydrodynamics, and paleotsunami studies. Objectives include mapping inundation extents for integration with models developed at centers such as Scripps Institution of Oceanography and Woods Hole Oceanographic Institution, measuring flow depths and velocities to calibrate hydrodynamic models used by ITIC and IOC-UNESCO, assessing building performance against standards promoted by ISO and ASCE, and collecting sedimentological and coral-reef evidence for long-term recurrence studies linked to paleoseismology efforts at institutions like Victoria University of Wellington.

Organizational structure and membership

The Team operates as a flexible coalition rather than a formal corporation, drawing experts from universities, national laboratories, and agencies including NOAA, USGS, JAMSTEC, NIWA, GNS Science, AGU, and regional institutions such as NERI and CSIR. Leadership for each deployment is typically a rotating coordination group composed of senior scientists affiliated with IUGG-member organizations and regional warning centers. Membership spans disciplines: seismology specialists, coastal engineering practitioners from UNIDO-partner universities, sedimentology researchers, ecology teams focused on reef damage, and social scientists from University of Canterbury-type groups studying community resilience. Funding and logistical support are provided by national research grants from agencies like NSF, EPSRC, ANR, and multilateral programs administered by World Bank disaster risk units.

Notable surveys and field deployments

Major deployments include surveys after the 2004 Indian Ocean tsunami, 2010 Chile earthquake, 2011 Tohoku tsunami in Japan, 2018 Sulawesi tsunami in Indonesia, and the 2022 Hunga Tonga–Hunga Haʻapai eruption and tsunami affecting Tonga, Fiji, and Samoa. Field teams have produced detailed inundation maps for Aceh, Banda Aceh, Phang Nga, Lhokseumawe, Sendai, and Palu that supported reconstruction planning by agencies such as ADB and UNDP. Smaller rapid-response missions have documented events along the coasts of Chile, Peru, New Zealand, Papua New Guinea, and Philippines to inform local building codes and evacuation zoning promulgated by entities like FEMA and national ministries.

Methodologies and data collection

Field protocols combine topographic surveying using GNSS and total stations from teams associated with Geoscience Australia and LINZ, photographic documentation by university photographers from University of California, Santa Cruz and University of Sydney, and measurement of maximum inundation and runup heights following standards developed with NOAA and USGS. Sediment cores and optically stimulated luminescence samples are collected by groups from University of Alaska Fairbanks and CNRS for paleotsunami stratigraphy, while coral boulder displacement is measured by reef scientists affiliated with University of the South Pacific and University of Queensland. Hydrodynamic parameters are inferred from debris line mapping and building damage assessments cross-referenced with model outputs from ADCIRC and COMCOT run by modeling centers at Scripps and Tsinghua University.

Major findings and impacts

Surveys have clarified relationships between earthquake source characteristics (e.g., rupture length from studies at IFREMER and USGS) and localized runup amplification driven by coastal geometry observed at Sendai Bay and Banda Aceh. Results influenced revisions to tsunami inundation maps used by IOC-UNESCO and informed updates to building standards endorsed by ASCE and ISO committees, leading to stronger coastal setback recommendations in jurisdictions such as New Zealand, Japan, and Chile. Paleotsunami discoveries from cores in Sumatra and Oregon improved recurrence interval estimates used by USGS and GNS Science for hazard modeling. Post-event social science outputs guided disaster risk reduction programming by UNDRR and IFRC.

Collaborations and training programs

The Team partners with academic programs at University of Washington, University of Tokyo, Monash University, and University of Auckland to offer field schools and short courses that teach reconnaissance methods, GIS mapping, and sampling protocols used by NOAA and USGS. Collaborative workshops held with IOC-UNESCO, WMO, UNDRR, and regional tsunami warning centers foster protocol harmonization, while joint projects with ADB and World Bank integrate survey outputs into resilience and reconstruction funding. Capacity-building efforts target Pacific island states through training with SPC and University of the South Pacific faculty to strengthen local survey and warning capabilities.

Category:Tsunami research organizations