TSUNAMI BULLETIN NO 12 | 2011 MARCH 11 – 1638 UTC

For more information, please see latest bulletins at the Pacific Tsunami Warning Center.

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TSUNAMI BULLETIN NUMBER 012
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1638Z 11 MAR 2011

THIS BULLETIN APPLIES TO AREAS WITHIN AND BORDERING THE PACIFIC
OCEAN AND ADJACENT SEAS...EXCEPT ALASKA...BRITISH COLUMBIA...
WASHINGTON...OREGON AND CALIFORNIA.

... A WIDESPREAD TSUNAMI WARNING IS IN EFFECT ...

A TSUNAMI WARNING IS IN EFFECT FOR

 JAPAN / TAIWAN / PHILIPPINES / BELAU /
 POHNPEI / CHUUK / KOSRAE / INDONESIA / PAPUA NEW GUINEA /
 NAURU / SOLOMON IS. / KIRIBATI / HOWLAND-BAKER /
 HAWAII / TUVALU / PALMYRA IS. / VANUATU / TOKELAU / JARVIS IS. /
 WALLIS-FUTUNA / SAMOA / AMERICAN SAMOA / COOK ISLANDS / NIUE /
 FIJI / NEW CALEDONIA / TONGA / MEXICO /
 KERMADEC IS / FR. POLYNESIA / PITCAIRN /
 GUATEMALA / EL SALVADOR / COSTA RICA / NICARAGUA / ANTARCTICA /
 PANAMA / HONDURAS / CHILE / ECUADOR / COLOMBIA / PERU

THIS BULLETIN IS ISSUED AS ADVICE TO GOVERNMENT AGENCIES.  ONLY
NATIONAL AND LOCAL GOVERNMENT AGENCIES HAVE THE AUTHORITY TO MAKE
DECISIONS REGARDING THE OFFICIAL STATE OF ALERT IN THEIR AREA AND
ANY ACTIONS TO BE TAKEN IN RESPONSE.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

 ORIGIN TIME -  0546Z 11 MAR 2011
 COORDINATES -  38.3 NORTH  142.4 EAST
 DEPTH       -   24 KM
 LOCATION    -  NEAR EAST COAST OF HONSHU  JAPAN
 MAGNITUDE   -  8.9

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

 GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
 -------------------  ----- ------  -----  ---------------  -----
 VANUATU              17.8S 168.3E  1542Z   0.69M /  2.3FT  22MIN
 LUGANVILLE VU        15.5S 167.2E  1537Z   0.54M /  1.8FT  54MIN
 LAUTOKA FJ           17.6S 177.4E  1545Z   0.33M /  1.1FT  76MIN
 WINTER HARBOUR BC    50.7N 128.3W  1504Z   0.51M /  1.7FT  30MIN
 CHARLESTON OR        43.3N 124.3W  1545Z   0.49M /  1.6FT  24MIN
 NORTH SPIT HUMBOLDT  40.8N 124.2W  1553Z   0.54M /  1.8FT  26MIN
 KAUMALAPAU HAWAII    20.8N 156.9W  1531Z   0.91M /  3.0FT  06MIN
 LOMBRUM MANUS IS PG   2.0S 147.4E  1529Z   1.04M /  3.4FT  62MIN
 PAGO PAGO AS         14.3S 170.7W  1556Z   0.34M /  1.1FT  16MIN
 ARENA COVE CA        38.9N 123.7W  1540Z   0.82M /  2.7FT  22MIN
 CRESCENT CITY CA     41.7N 124.2W  1536Z   1.12M /  3.7FT  60MIN
 PORT ORFORD OR       42.7N 124.5W  1534Z   0.52M /  1.7FT  16MIN
 HONIARA SB            9.4S 160.0E  1402Z   0.21M /  0.7FT  72MIN
 MANUS PG              2.0S 147.4E  1425Z   0.93M /  3.1FT  34MIN
 HONOLULU OAHU        21.3N 157.9W  1410Z   0.71M /  2.3FT  32MIN
 KANTON KI             2.8S 171.7W  1425Z   0.05M /  0.2FT  10MIN
 CHRISTMAS KI          2.0N 157.5W  1447Z   0.56M /  1.9FT  52MIN
 KAWAIHAE HAWAII      20.0N 155.8W  1413Z   1.22M /  4.0FT  14MIN
 HILO HAWAII          19.7N 155.1W  1409Z   1.41M /  4.6FT  36MIN
 BETIO TARAWA KI       1.4N 172.9E  1225Z   0.21M /  0.7FT  24MIN
 NAURU                 0.5S 166.9E  1156Z   0.20M /  0.7FT  24MIN
 NAWILIWILI KAUAI     22.0N 159.4W  1343Z   0.76M /  2.5FT  12MIN
 DART 51407           19.6N 156.5W  1337Z   0.15M /  0.5FT  14MIN
 KAHULUI MAUI         20.9N 156.5W  1327Z   1.74M /  5.7FT  52MIN
 BARBERS PT HI        21.3N 158.1W  1308Z   0.70M /  2.3FT  64MIN
 TERN FR. FRIGATE US  23.9N 166.3W  1224Z   0.38M /  1.2FT  16MIN
 JOHNSTON US          16.7N 169.5W  1206Z   0.20M /  0.7FT  72MIN
 DART 52402           11.7N 154.2E  0931Z   0.29M /  0.9FT  22MIN
 DART 46403           52.7N 156.9W  1127Z   0.09M /  0.3FT  60MIN
 LEGASPI PH           13.1N 123.8E  1116Z   0.25M /  0.8FT  58MIN
 KWAJALEIN MH          8.7N 167.7E  1111Z   0.55M /  1.8FT  48MIN
 NIKOLSKI AK          52.9N 168.9W  1109Z   0.27M /  0.9FT  64MIN
 HANASAKI HOKKAIDO J  43.3N 145.6E  0656Z   1.83M /  6.0FT  24MIN
 MIDWAY               28.2N 177.4W  1048Z   1.27M /  4.2FT  12MIN
 TOSASHIMIZU SHIKOKU  32.8N 133.0E  0946Z   0.84M /  2.8FT  28MIN
 ADAK AK              51.9N 176.6W  1034Z   0.35M /  1.2FT  22MIN
 YAP FM                9.5N 138.1E  1013Z   0.15M /  0.5FT  88MIN
 DART 21415           50.2N 171.8E  0845Z   0.27M /  0.9FT  52MIN
 WAKE US              19.3N 166.6E  0928Z   0.39M /  1.3FT  14MIN
 NAHA OKINAWA JP      26.2N 127.7E  0901Z   0.25M /  0.8FT  60MIN
 SAIPAN US            15.2N 145.7E  0916Z   0.65M /  2.1FT  30MIN
 OMAEZAKI HONSHU JP   34.6N 138.2E  0818Z   1.42M /  4.6FT  56MIN
 DART 21419           44.5N 155.7E  0716Z   0.40M /  1.3FT  20MIN
 DART 21413           30.5N 152.1E  0659Z   0.76M /  2.5FT  32MIN
 DART 21401           42.6N 152.6E  0643Z   0.67M /  2.2FT  40MIN
 DART 21418           38.7N 148.7E  0619Z   1.08M /  3.5FT  06MIN

 LAT  - LATITUDE (N-NORTH, S-SOUTH)
 LON  - LONGITUDE (E-EAST, W-WEST)
 TIME - TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)
 AMPL - TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.
        IT IS ...NOT... CREST-TO-TROUGH WAVE HEIGHT.
        VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).
 PER  - PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.

 NOTE - DART MEASUREMENTS ARE FROM THE DEEP OCEAN AND THEY
        ARE GENERALLY MUCH SMALLER THAN WOULD BE COASTAL
         MEASUREMENTS AT SIMILAR LOCATIONS.

EVALUATION

 SEA LEVEL READINGS CONFIRM THAT A TSUNAMI HAS BEEN GENERATED
 WHICH COULD CAUSE WIDESPREAD DAMAGE. AUTHORITIES SHOULD TAKE
 APPROPRIATE ACTION IN RESPONSE TO THIS THREAT. THIS CENTER WILL
 CONTINUE TO MONITOR SEA LEVEL DATA TO DETERMINE THE EXTENT AND
 SEVERITY OF THE THREAT.

 A TSUNAMI IS A SERIES OF WAVES AND THE FIRST WAVE MAY NOT BE THE
 LARGEST. TSUNAMI WAVE HEIGHTS CANNOT BE PREDICTED AND CAN VARY
 SIGNIFICANTLY ALONG A COAST DUE TO LOCAL EFFECTS. THE TIME FROM
 ONE TSUNAMI WAVE TO THE NEXT CAN BE FIVE MINUTES TO AN HOUR, AND
 THE THREAT CAN CONTINUE FOR MANY HOURS AS MULTIPLE WAVES ARRIVE.

 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.

BULLETINS WILL BE ISSUED HOURLY OR SOONER IF CONDITIONS WARRANT.
THE TSUNAMI WARNING WILL REMAIN IN EFFECT UNTIL FURTHER NOTICE.

THE JAPAN METEOROLOGICAL AGENCY MAY ALSO ISSUE TSUNAMI MESSAGES
FOR THIS EVENT TO COUNTRIES IN THE NORTHWEST PACIFIC AND SOUTH
CHINA SEA REGION.  IN CASE OF CONFLICTING INFORMATION... THE
MORE CONSERVATIVE INFORMATION SHOULD BE USED FOR SAFETY.

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS
FOR ALASKA...BRITISH COLUMBIA...WASHINGTON...OREGON...CALIFORNIA.


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