ICG/ITSU International Coordination Group for the Tsunami Warning System in t he Pacific. ICG/ITSU is an international organization for promoting cooperation and coordination of tsunami mitigation activities. It was established in 1965 as a sub sidiary body of the Intergovernmental Oceanographic Commission (IOC) of UNESCO, and is composed of national representatives from Member States in the Pacific Region. It meets every two years to review progress and coordinate activities resulting in improvements to the Tsunami Warning System. There are currently 25 Member States: Australia, Canada, Chile, China, Colombia, Cook Islands, Costa Rica, Democratic People’s Republic of Korea, Ecuador, Fiji, France, Guatemala, Indonesia, Japan, Mexico, New Zealand, Nicaragua, Peru, Philippines, Republic of Korea , Singapore,Thailand, Federation of Russia, United States of America, and Western Samoa. ITSU member states

initial rise Time of the firsminimum t of the tsunami waves.

intensity Extreme strength, force or energy.

internal tsunami Tsunami wave manifested as an internal wave and traveling along a thermocline.

inundation area Area flooded with water by the tsunami.

inundation line Inland limit of wetting, measured horizontally from the mean sea level (MSL) line. The vegetation line is sometimes used as a reference. If it can be determined that it is more than 10 feet from the MSL line, adjust; otherwise, ignore. In tsunami science, the landward limit of tsunami runup.

ITIC International Tsunami Information Center. Established in 1968 by the IOC, ITIC works closely with the Pacific Tsunami Warning Center (PTWC). Located in Honolulu, Hawaii, ITIC is responsible, among other functions for: monitoring the international tsunami warning activities in the Pacific and recommending improvements with regard to communications, data networks, data acquisition, and information dissemination; bringing to Members and non-members information on tsunami warning systems, on affairs of ITIC and on how to become active participants in the activities of ITSU; assisting Member States of ITSU establishment of national warning systems and improving preparedness for tsunamis for all nations throughout the Pacific Ocean; gathering and promulgating knowledge about tsunamis and fostering tsunami research and its application to prevent loss of life and damage to property.

ITSU International Coordination Group for the Tsunami Warning System in the Pacific (a shortening of International TSUnami).

IUGG International Union of Geodesy and Geophysics.