In summary: Tsunami Warning - a tsunami warning is issued when a potential tsunami with significant widespread inundation is imminent or expected.Tags: Essays On Mama DayThesis On DwdmEssay Picturesque BeautyGcse 21st Century Science Coursework Mark SchemeMadness In Hamlet EssayCollege Success Essay
Tsunami is a Japanese word with the English translation, "harbor wave." Represented by two characters, the top character, "tsu," means harbor, while the bottom character, "nami," means "wave." In the past, tsunamis were sometimes referred to as "tidal waves" by the general public, and as "seismic sea waves" by the scientific community.
The term "tidal wave" is a misnomer; although a tsunami's impact upon a coastline is dependent upon the tidal level at the time a tsunami strikes, tsunamis are unrelated to the tides.
WCATWC distributes these messages to Emergency Measures Organizations (EMO) and other clients 5 to 15 minutes after a potentially tsunamigenic earthquake has occurred and provide updates at regular intervals.
WCATWC product definitions changed to the definitions provided below on February 12, 2008.
Advisories are normally updated to continue the advisory, expand/contract affected areas, upgrade to a warning, or cancel the advisory.
Tsunami Information Statement - a tsunami information statement is issued to inform emergency management officials and the public that an earthquake has occurred, or that a tsunami warning, watch or advisory has been issued for another section of the ocean.Information statements may be re-issued with additional information, though normally these messages are not updated.However, a watch, advisory or warning may be issued for the area, if necessary, after analysis and/or updated information becomes available.In most cases, information statements are issued to indicate there is no threat of a destructive tsunami and to prevent unnecessary evacuations as the earthquake may have been felt in coastal areas.An information statement may, in appropriate situations, caution about the possibility of destructive local tsunamis.Warnings may be updated, adjusted geographically, downgraded, or canceled.To provide the earliest possible alert, initial warnings are normally based only on seismic information.Data from selected NRCan seismometers are forwarded to the National (United States) Oceanic and Atmospheric Administration’s (NOAA) West Coast and Alaska Tsunami Warning Centre (WCATWC) in Palmer, Alaska.This information is integrated with other seismic, tide gauge, and deep ocean buoy system data to produce tsunami information statements, alerts, watches, or warnings for all North American coastlines (including the Atlantic and Arctic).These events are recorded in the oral traditions of the First Nations people on Vancouver Island.There is evidence of repeated tsunamis inundating our west coast following giant megathrust earthquakes in the Cascadia seismic zone.