Tsunami watch for Indonesia has been cancelled, no threat to Hawaii from 7.7M quake

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Tsunami watch for Indonesia has been cancelled, no threat to Hawaii from 7.7M quake

Posted on April 6, 2010. Tags: earthquake, indonesia

UPDATED MEDIA RELEASE (4/6/10 3:45 p.m. HST)

TSUNAMI BULLETIN NUMBER 003
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 0015Z 07 APR 2010

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

… THE TSUNAMI WATCH IS CANCELLED …

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 -  2215Z 06 APR 2010
COORDINATES -   2.4 NORTH   97.2 EAST 
LOCATION    -  NORTHERN SUMATRA  INDONESIA
MAGNITUDE   -  7.5

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
-------------------  ----- ------  -----  ---------------  -----
TELUKDALAM ID         0.6N  97.8E  2301Z   0.14M /  0.5FT  16MIN

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

SEA LEVEL READINGS INDICATE THAT A SIGNIFICANT TSUNAMI WAS NOT GENERATED. THEREFORE THE TSUNAMI WATCH ISSUED BY THIS CENTER IS NOW CANCELLED.

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.

MEDIA RELEASE (4/6/10)

TSUNAMI BULLETIN NUMBER 002
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 2322Z 06 APR 2010

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

… A LOCAL TSUNAMI WATCH IS IN EFFECT …

A TSUNAMI WATCH IS IN EFFECT FORÂ INDONESIA

FOR OTHER AREAS OF THE INDIAN OCEAN REGION…THIS MESSAGE IS FOR INFORMATION ONLY AT THIS TIME.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME – 2215Z 06 APR 2010 (April 6, 2010, 12:15 p.m. HST)
COORDINATES – 2.4 NORTH 97.2 EAST
LOCATION – NORTHERN SUMATRA INDONESIA
MAGNITUDE – 7.5

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
-------------------  ----- ------  -----  ---------------  -----
TELUKDALAM ID         0.6N  97.8E  2301Z   0.14M /  0.5FT  16MIN

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

SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY HAVE BEEN DESTRUCTIVE ALONG COASTS NEAR THE EARTHQUAKE EPICENTER. FOR THOSE AREAS – WHEN 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.

NO TSUNAMI THREAT EXISTS FOR OTHER COASTAL AREAS IN THE INDIAN OCEAN ALTHOUGH SOME OTHER AREAS MAY EXPERIENCE SMALL SEA LEVEL CHANGES AND STRONG OR UNUSUAL COASTAL CURRENTS.

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    2246Z 06 APR
                 BELAWAN             3.8N  98.8E    0233Z 07 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.