AKG SEISMOLOGY-
*** POWERFUL AFTERSHOCK HITS WEST COAST OF NORTHERN SUMATRA***
*** USGC REPORTS 8.2M***
A STRONG AFTERSHOCK HAS BEEN REPORTED AT 0.773°N, 92.452°E
AT 10:43:09 UTC
AS OF NOW, TSUNAMI IS HEADING TOWARDS THE THAILAND COAST
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UPDATED INFORMATION FROM PACIFIC TSUNAMI WARNING CENTER IS INDICATING A STRONGER TSUNAMI WAVE THAN THE PREVIOUS HITING INDONESIA COAST
TSUNAMI BULLETIN NUMBER 004
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1054Z 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 11:43Z WITH MAGNITUDE 8.3 ...
A TSUNAMI WATCH IS STILL IN EFFECT FOR
INDONESIA / INDIA / AUSTRALIA / SRI LANKA / MYANMAR / THAILAND /
MALDIVES / UNITED KINGDOM / MALAYSIA / MAURITIUS / REUNION /
SEYCHELLES / OMAN / PAKISTAN / SOMALIA / MADAGASCAR / IRAN /
UAE / YEMEN / COMORES / MOZAMBIQUE / KENYA / TANZANIA /
CROZET ISLANDS / BANGLADESH / KERGUELEN ISLANDS / SOUTH AFRICA /
SINGAPORE
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
------------------- ----- ------ ----- --------------- -----
TELUKDALAM ID 0.6N 97.8E 0952Z 0.15M / 0.5FT 08MIN
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
SABANG ID 5.8N 95.3E 0956Z 0.31M / 1.0FT 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.
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.
