Tsunami Event Lists

Tsunami Events > Tsunami Event Lists

International Alerts issued by the Pacific Tsunami Warning Center (PTWC), Northwest Pacific Tsunami Advisory Center (NWPTAC), and US National Tsunami Warning Center (USNTWC) for events M6.5 or greater in the Pacific and Atlantic, and M6.0 or greater in the Caribbean.

The PTWC issues:

• From 01 October 2014, the Pacific Tsunami Warning Center (P) issues: Tsunami Information Statements (TIS) and Tsunami Threat Messages (TTM).   
• Prior to 01 October 2014, the Pacific Tsunami Warning Center (P) issued: Tsunami Information Bulletins (TIB), Fixed and Expanding Regional Warnings (FRW, ERW), and Ocean-wide or Widespread Watch/Warnings (TWW) for the Pacific; Tsunami Information Statements (TIS), Local, Regional, and Ocean-wide Watches (LTW, RTW, TW) for the wider Caribbean (C). 
• Domestically, Tsunami Information Statements (TIS), Tsunami Advisories (TA), Tsunami Watch/Warnings (TWW) for US Insular States and Territories (American Samoa, Guam/CNMI, Hawaii, Puerto Rico, US and British Virgin Islands).  Prior to April 3, 2017, domestic alerts to Puerto Rico, US and British Virgin Islands were issued by the USNTWC.

The Japan Meteorological Agency (J), issues: Tsunami Advisories (NWPTA) for the Northwestern Pacific. 

The US National Tsunami Warning Center (N), formerly known as West Coast/Alaska Tsunami Warning Center, was renamed on  01 October 2013, issues: Tsunami Information Statements (TIS), Tsunami Advisories (TA), Tsunami Watch/Warnings (TWW) for the US Alaska and West Coast (Washington, Oregon, California), the US East Coast, and Canada (Pacific and Atlantic). 

Depth (from GCMT solution), epicenter and Moment Magnitude (Mw) from the USGS (G), and preliminary Mw from PTWC, USNTWC, and JMA at action time. Other earthquakes with Mw greater than or equal to 6.5 and a depth no greater than 100 km, as recorded by USGS, have also been included. Wave height and period measurements from sea level gauges (g) reported as amplitude (amp), peak to trough, or greatest value for either flow depth (fd) or runup (r) as indicated. Event location (e.g. name) is derived from PTWC message(s).