A basin-wide network of island and coastal tide gauges for confirmation (or denial) of tsunami and to provide direct evidence on the magnitude. They will also provide data for testing and validating models, both in scenario-building mode and as forecasts/hindcasts. For critical sites, data will be collected at at least 1 minute intervals and transmitted in real-time (e.g., 15 minute blocks), perhaps with options to transmit more rapidly in times of threat.

 A targeted network of deep-sea pressure measuring DART-like moorings (tsunameters), mostly located off the Sumatran Trench in the eastern Indian Ocean and around the Makran source in the Arabian Sea. Total numbers are likely to be in the range 10-16. Systems will typical transmit in 1 hour blocks and be triggered into real-time links when major perturbations are detected.

 Ocean forecast models, initialized by sea floor perturbations estimated from seismic data and (usually) constrained by assimilated ocean pressure and sea level data. There will usually be open-ocean models and coastal embedded models, perhaps down to fine scales for inundation forecasts. These same models would also be used to construct scenarios and a subset of the scenarios will be selected based on the observations.