Tsunami Bulletin no. 007

000 WEPA40 PHEB 111132 TSUPAC TSUNAMI BULLETIN NUMBER 007 PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS ISSUED AT 1132Z 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 / RUSSIA / MARCUS IS. / N. MARIANAS / GUAM / WAKE IS. /  TAIWAN / YAP / PHILIPPINES / MARSHALL IS. / BELAU / MIDWAY IS. /  POHNPEI / CHUUK / KOSRAE / INDONESIA / PAPUA NEW GUINEA /  NAURU / JOHNSTON IS. / 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  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  LEGASPI PH           13.1N 123.8E  1022Z   0.29M /  1.0FT  **MIN  MIDWAY               28.2N 177.4W  1028Z   1.56M /  5.1FT  80MIN  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  HANASAKI HOKKAIDO J  43.3N 145.6E  0657Z   2.79M /  9.2FT  76MIN  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.