With surface wave or moment magnitude (Mw) greater than or equal to 6.5 and a depth no greater than 100m, or an event for which an international warning centre issues a message. Pacific Tsunami Warning Center (P) issues; Tsunami Information Bulletins (TIB), Expanding (ERW) or Fixed (FRW) Regional Warnings, Regional Watch/Warnings (RWW), Indian Ocean Watch Bulletins (IO) or Caribbean Tsunami statements (TS). Japan Meteorological Agency (J), issues Northwest Pacific Tsunami Advisories (NWPTA), or Indian Ocean Tsunami Watch Information Bulletins (TWI). Epicenter, depth (from GCMT solution) and Mw from USGS (G); from Harvard (H, which changes to GCMT in July 2007), and Mw from PTWC (P) at action time. Height measurements from tide gauges peak to trough or half peak to trough as indicated, otherwise measurement is the greatest value for either inundation or run-up depending on the event.

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