The goal of the PTWS is to detect, locate and determine the magnitude of earthquakes that may be affected by tsunamis in the Pacific Basin or its immediate edges. Seismic information is provided by seismic stations operated by PTWC, ATWC, the U.S. Geological Survey`s National Earthquake Information Center and international sources. If the situation and strength of an earthquake meets the known criteria for producing a tsunami, a tsunami warning will be issued to warn of the threat of a tsunami. The alert includes expected arrival times for tsunamis in selected coastal communities within the geographic area, defined by the maximum distance the tsunami could travel in a matter of hours. For a geographic area defined by the distance the tsunami could travel in a later period, a tsunami clock will be issued, with additional arrival times planned for the tsunami. ITIC`s overall mission is to mitigate the effects of tsunamis throughout the Pacific, a) by helping ICG/ITSU member states develop and improve tsunami preparedness; b) monitoring and improving the Pacific tsunami warning system; (c) collecting and disseminating tsunami knowledge and promoting tsunami research; and (d) to provide third countries with knowledge of the tsunami warning system and information on how ICGs/STIIs can become participants. National Tsunami BulletinsUS NTWC Tsunami Bulletin issues alerts for Canada and U.S. states in North America.
The Pacific Tsunami Warning Centre in Ewa Beach, Hawaii, serves as a regional tsunami warning centre for Hawaii and a national/international tsunami warning centre, which poses a threat to the Pacific. This international alert effort became a formal agreement in 1965, when PTWC assumed international responsibility for warning the Pacific Tsunami Warning System (PTWS). The PTWS is made up of 26 international member states, which are organized as an international coordination group for the Pacific Tsunami Warning System. The Pacific Tsunami Warning System (TWS), made up of 26 participating international Member States, monitors seismological and tidal stations throughout the Pacific Basin to assess earthquakes likely to be affected by tsunamis and to disseminate information on tsunami warnings. The Pacific Tsunami Warning Center (PTWC) is the operational hub of the Pacific TWS. Ptwc is located near Honolulu, Hawaii, and informs Pacific Basin national authorities of tsunami warnings. Of the 28 countries that feed the Indian Ocean, Australia, Indonesia and India are now spearheading tsunami warnings in the region.  Indonesia was hit by tsunamis in September and December 2018. The December 2018 tsunami was caused by a volcano.  An alert system for the Indian Ocean was triggered by the 2004 Indian Ocean earthquake and the resulting tsunami, which left an estimated 250,000 people dead or missing.