An earthquake occurred at 191818Z mar, preliminary magnitude of 7.7 vicinity 23.0S 174.8W

Original warning text

AN EARTHQUAKE OCCURRED AT 191818Z MAR, PRELIMINARY
MAGNITUDE OF 7.7 VICINITY 23.0S 174.8W. SEA LEVEL
READINGS CONFIRM THAT A TSUNAMI WAS GENERATED.
THIS TSUNAMI MAY HAVE BEEN DESTRUCTIVE ALONG
COASTLINES OF THE REGION NEAR THE EARTHQUAKE EPICENTER.
AUTHORITIES IN THE REGION SHOULD TAKE APPROPRIATE
ACTION IN RESPONSE TO THIS POSSIBILITY. THIS
CENTER WILL CONTINUE TO MONITOR SEA LEVEL GAUGES
NEAREST THE REGION AND REPORT IF ANY ADDITIONAL
TSUNAMI WAVE ACTIVITY. THE WARNING WILL NOT
EXPAND TO OTHER AREAS OF THE PACIFIC UNLESS
ADDITIONAL DATA ARE RECEIVED TO WARRANT SUCH
AN EXPANSION FOR AFFECTED AREAS - WHEN NO MAJOR
WAVES ARE OBSERVED FOR TWO HOURS AFTER THE
ESTIMATED TIME OF ARRIVAL OR DAMAGING WAVES HAVE
NOT OCCURRED FOR AT LEAST TWO HOURS THEN LOCAL
AUTHORITIES CAN ASSUME THE THREAT IS PASSED.
DANGER TO BOATS AND COASTAL STRUCTURES CAN
CONTINUE FOR SEVERAL HOURS DUE TO RAPID CURRENTS.
AS LOCAL CONDITIONS CAN CAUSE A WIDE VARIATION
IN TSUNAMI WAVE ACTION THE ALL CLEAR
DETERMINATION MUST BE MADE BY LOCAL
AUTHORITIES. ESTIMATED INITIAL TSUNAMI WAVE
ARRIVAL TIMES AT FORECAST POINTS WITHIN THE
WARNING AND WATCH AREAS ARE GIVEN
BELOW. ACTUAL ARRIVAL TIMES MAY DIFFER AND
THE INITIAL WAVE MAY NOT BE THE LARGEST.
A TSUNAMI IS A SERIES OF WAVES AND THE TIME
BETWEEN SUCCESSIVE WAVES CAN BE FIVE MINUTES
TO ONE HOUR. CAUTION ADVISED.