TSUNAMI BULLETIN NO 6 | 2011 MARCH 11 – 1030 UTC

For more information, please see the Pacific Tsunami Warning Center’s latest bulletins for the Pacific basin.

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TSUNAMI BULLETIN NUMBER 006
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1030Z 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
------------------- ----- ------ ----- --------------- -----
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
TOSASHIMIZU SHIKOKU 32.8N 133.0E 0753Z 0.92M / 3.0FT 68MIN
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.

TSUNAMI BULLETIN NUMBER 006

PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS

ISSUED AT 1030Z 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

——————-  —– ——  —–  —————  —–

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

TOSASHIMIZU SHIKOKU  32.8N 133.0E  0753Z   0.92M /  3.0FT  68MIN

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.

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