TSUNAMI BULLETIN NUMBER 003
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 2104Z 25 SEP 2003
THIS BULLETIN IS FOR ALL AREAS OF THE PACIFIC BASIN EXCEPT
ALASKA - BRITISH COLUMBIA - WASHINGTON - OREGON - CALIFORNIA.
........... A TSUNAMI WARNING AND WATCH ARE IN EFFECT ............
A TSUNAMI WARNING IS IN EFFECT FOR
JAPAN / RUSSIA / MARCUS IS. / N. MARIANAS / GUAM / WAKE IS.
A TSUNAMI WATCH IS IN EFFECT FOR
TAIWAN / YAP / MARSHALL IS. / MIDWAY IS. / CHUUK / POHNPEI /
BELAU / PHILIPPINES / KOSRAE / JOHNSTON IS. / NAURU / HAWAII
FOR ALL OTHER PACIFIC AREAS, THIS MESSAGE IS AN ADVISORY ONLY.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 1950Z 25 SEP 2003
COORDINATES - 42.1 NORTH 143.6 EAST
LOCATION - EASTERN HONSHU JAPAN
MAGNITUDE - 8.1
MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
LOCATION SIZE
URAKAWA HOKAIDO JAPAN 0.5M
KAMAISHI HONSHU JAPAN 0.5M
SIZE - CURRENT MAXIMUM CREST-TO-MEAN IN METERS
EVALUATION
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY HAVE
BEEN DESTRUCTIVE ALONG COASTS NEAR THE EARTHQUAKE EPICENTER AND
COULD ALSO BE A THREAT TO MORE DISTANT COASTS. AUTHORITIES SHOULD
TAKE APPROPRIATE ACTION IN RESPONSE TO THIS POSSIBILITY. THIS
CENTER WILL CONTINUE TO MONITOR SEA LEVEL DATA TO DETERMINE THE
EXTENT AND SEVERITY OF THE THREAT.
FOR ALL 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. ACTUAL ARRIVAL TIMES
MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE LARGEST. THE TIME
BETWEEN SUCCESSIVE TSUNAMI WAVES CAN BE FIVE MINUTES TO ONE HOUR.
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