2. In 2004 a tsunami in the Indian Ocean There was no sea-‐level monitoring instruments in the Indian Ocean in 2004. Many countries did not have agencies responsible for tsunami warnings or points of contact to receive messages from international warning centers. The United Nations Intergovernmental Oceanographic Commission began to create an Ocean tsunami early warning system after the 2004 Indian Ocean tsunami.
3. Work of JAM and PTWC When an earthquake strikes in the Indian Ocean region, data is transmitted to the Paciﬁc Tsunami Warning Centre (PTWC) and Japan Meteorological Agency (JAM). They have responsibility for providing the Indian Ocean with what are known as tsunami watches.
4. Works of ADPC ADCP is a private international disaster prevention center founded in Bangkok in 1986. ADCP are on track to become regional watch providers. The ADPC has been coordinating to have a multi-‐hazard early warning system (RIMES). RIMES will work alongside the national and regional watch providers and will also share information with Hawaii and Japan.
5. Primary responsibility of Hawaii and Japan They receive earthquake information and data from tidal gauges and Deep-‐ocean Assessment and Reporting of Tsunamis (DART) sensors or buoys. They receive news bulletins, telegrams, and information over the telephone. The commission for the Nuclear-‐Test Ban Treaty Organization (CTBTO) provide data from seismographic stations. The job of these two centres is to locate and determine the size of earthquakes. The possibility that the earthquake causes the tsunami decides of how. The attainment time of the tsunami is forecast.
6. When the two centres issue watches to national bodies in Indian Ocean It is the responsibility of each national agency to alert its people. 26 out of 28 Indian Ocean countries have focal points to receive tsunami bulletins, according to UNESCO.
7. Warnings ways to the population Radio, television, SMS, e-‐mail, bell megaphone, and loudspeaker are used as a transmission ways. In the some countries, well-‐rehearsed drills is done.
8. Warning is confused by the diﬀerence of the language. In the place where the infrastructure is poor, it is diﬃcult to transmit. The Tsunami Warning System will keep upgrading to defend our body in the future, and working.