TSUNAMI WARNING ISSUED !

TSUNAMI BULLETIN NUMBER 005 
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS 
ISSUED AT 1151Z 11 APR 2012

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

-AN INDIAN-OCEAN-WIDE TSUNAMI WATCH IS IN EFFECT

-A MAJOR AFTERSHOCK OCCURRED AT 1043Z WITH MAGNITUDE 8.3

... THE WATCH AREA IS NOW REDUCED ...

A TSUNAMI WATCH IS IN EFFECT FOR

INDONESIA / INDIA / SRI LANKA / MALDIVES / UNITED KINGDOM

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 -  0839Z 11 APR 2012
 COORDINATES -   2.3 NORTH   93.1 EAST
 LOCATION    -  OFF W COAST OF NORTHERN SUMATRA
 MAGNITUDE   -  8.7

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

 GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
 -------------------  ----- ------  -----  ---------------  -----
 TRINCONMALEE LK       8.6N  81.2E  1116Z   0.04M /  0.1FT  18MIN
 COCOS ISLAND AU      12.1S  96.9E  1102Z   0.08M /  0.3FT  18MIN
 TELUKDALAM ID         0.6N  97.8E  1045Z   0.19M /  0.6FT  10MIN
 SABANG ID             5.8N  95.3E  1010Z   0.36M /  1.2FT  06MIN
 MEULABOH ID           4.1N  96.1E  1007Z   1.06M /  3.5FT  12MIN
 DART 23401            8.9N  88.5E  0956Z   0.03M /  0.1FT  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 INDICATE A TSUNAMI WAS GENERATED. IT MAY
 ALREADY HAVE BEEN DESTRUCTIVE ALONG SOME COASTS.

 BASED ON THESE DATA THE THREAT CONTINUES FOR ALL COASTAL AREAS OF
 THE INDIAN OCEAN. FOR THOSE AREAS - WHEN NO MAJOR WAVES HAVE
 OCCURRED FOR AT LEAST TWO HOURS AFTER THE ESTIMATED ARRIVAL TIME
 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.

 LOCATION         FORECAST POINT     COORDINATES     ARRIVAL TIME
 --------------------------------    ------------    ------------
 INDONESIA        SIMEULUE            2.5N  96.0E    0912Z 11 APR
                  BANDA_ACEH          5.5N  95.1E    0933Z 11 APR
                  SIBERUT             1.5S  98.7E    0944Z 11 APR
                  PADANG              0.9S 100.1E    1025Z 11 APR
                  BENGKULU            3.9S 102.0E    1037Z 11 APR
                  CILACAP             7.8S 108.9E    1150Z 11 APR
                  BANDAR_LAMPUNG      5.7S 105.3E    1200Z 11 APR
                  BALI                8.7S 115.3E    1234Z 11 APR
                  BELAWAN             3.8N  98.8E    1326Z 11 APR
                  KUPANG             10.0S 123.4E    1333Z 11 APR
                  BALI                8.7S 115.3E    1234Z 11 APR
 INDIA            GREAT_NICOBAR       7.1N  93.6E    0937Z 11 APR
                  LITTLE_ANDAMAN     10.7N  92.3E    1015Z 11 APR
                  NORTH_ANDAMAN      13.3N  92.6E    1045Z 11 APR
                  PORT_BLAIR         11.9N  92.7E    1050Z 11 APR
                  CHENNAI            13.4N  80.4E    1134Z 11 APR
                  TRIVANDRUM          8.3N  76.9E    1204Z 11 APR
                  KAKINADA           17.2N  82.7E    1204Z 11 APR
                  MANGALORE          13.3N  74.4E    1339Z 11 APR
                  BOMBAY             18.8N  72.6E    1605Z 11 APR
                  GULF_OF_KUTCH      22.7N  68.9E    1636Z 11 APR
 SRI LANKA        TRINCOMALEE         8.7N  81.3E    1049Z 11 APR
                  DONDRA_HEAD         5.9N  80.6E    1054Z 11 APR
                  COLOMBO             6.9N  79.8E    1121Z 11 APR
                  JAFFNA              9.9N  80.0E    1235Z 11 APR
 MALDIVES         GAN                 0.6S  73.2E    1144Z 11 APR
                  MALE                4.2N  73.6E    1149Z 11 APR
                  MINICOV             8.3N  73.0E    1214Z 11 APR
 UNITED KINGDOM   DIEGO_GARCIA        7.3S  72.4E    1202Z 11 APR

ADDITIONAL BULLETINS WILL BE ISSUED BY THE PACIFIC TSUNAMI
WARNING CENTER FOR THIS EVENT AS MORE INFORMATION
BECOMES AVAILABLE.

THE JAPAN METEOROLOGICAL AGENCY MAY ISSUE ADDITIONAL INFORMATION
FOR THIS EVENT. IN THE CASE OF CONFLICTING INFORMATION...THE
MORE CONSERVATIVE INFORMATION SHOULD BE USED FOR SAFETY.
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