1
2	What is tsunami? A system of ocean gravity waves formed as a result of large-scale displacement of sea surface. Can travel long distances without losing energy. Length and Time Period Long wave length (of several 100 km) Periods of a few minutes to about an hour Speed proportional to square root of water depth 500 to 1000 km per hour in Deep Ocean About 30 km per hour near shore Height of Tsunami Wave Less than a metre in the Deep Ocean Grows to Tens of metres near shore
3
4	ICG/IOTWS Terms of Reference coordinate IOTWS; promote establishment and development of national tsunami warning and mitigation capacities; facilitate exchange of seismic, sea level data; promote sharing of experience and expertise related to tsunami warning and mitigation; liaise with other tsunami warning systems; and relevant organizations, programmes and projects; promote capacity-building promote tsunami research
5	How does it function? Based on joint operation of international networks of detection connected with national tsunami warning centres High-level commitment by country with UN governance provided under the IOC Each nation is responsible for issuing warnings in their territory and for protecting its own population. National centres must have strong links with emergency preparedness authorities (national, provincial and local)
6	"WG1:" WG1: Seismic measurements, data collection and exchange WG2: Sea level data collection and exchange, including DART WG3: Risk assessment WG4: Modelling, forecasting and scenario development WG5: System of interoperable advisory and warning centres WG6: Mitigation, preparedness and response
7
8	"Tsunami Warning Centre" Tsunami Warning Centre Numerical Modelling Tsunami Storm Surge
9
10
11
12
13
14
15
16
17
18
19	Performance of Model
20	Water Level at Tidal Stations
21
22
23	Future Work Understanding Tectonics Continuous monitoring and recording of the earthquakes characterizing the lithospheric deformation 3D Seismic mapping NGRI, NCAOR, INCOIS… History of tsunami Stratigraphy record of paleo-tsunami deposits, Identification, mapping and dating fossil micro-atoll surfaces OSL and radiocarbon dating, PRL, IISC, NGRI, IITs, Universities……
24