Indian Ocean Tsunami Watch Cancellation

TSUNAMI BULLETIN NUMBER 004
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1657Z 25 OCT 2010

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

... TSUNAMI WATCH CANCELLATION SUPPLEMENT ...

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 -  1442Z 25 OCT 2010
 COORDINATES -   3.1 SOUTH  100.1 EAST 
 DEPTH       -   33 KM
 LOCATION    -  SOUTHERN SUMATRA  INDONESIA
 MAGNITUDE   -  7.5

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

 GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
------------------  ----- ------  -----  ---------------  -----
   TANAHBALAH ID         0.5S  98.5E  1605Z   0.23M /  0.8FT  16MIN
   PADANG ID             0.9S 100.4E  1558Z   0.33M /  1.1FT  14MIN
   ENGGANO ID            5.3S 102.3E  1528Z   0.27M /  0.9FT  06MIN
   COCOS ISLAND AU      12.1S  96.9E  1612Z   0.11M /  0.4FT  08MIN

 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.

EVALUATION

 A SIGNIFICANT TSUNAMI WAS GENERATED BY THIS EARTHQUAKE.             
 HOWEVER...SEA LEVEL READINGS NOW INDICATE THAT THE THREAT HAS       
 DIMINISHED OR IS OVER FOR MOST AREAS.  THEREFORE THE TSUNAMI        
 WATCH ISSUED BY THIS CENTER IS NOW CANCELLED.                       
                                                                     
 FOR ANY AFFECTED 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.                                                        

THIS WILL BE THE FINAL BULLETIN ISSUED BY THE PACIFIC TSUNAMI
WARNING CENTER FOR THIS EVENT UNLESS ADDITIONAL 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.