Tsunami watch issued after Indian Ocean 7.6 quake

CNN) — A tsunami watch has been issued after a 7.6-magnitude earthquake in the Indian Ocean near India’s Andaman Islands, authorities said.

95_15The watch covers India, Myanmar, Thailand, Indonesia and Bangladesh, according to the Pacific Tsunami Warning Center.

The quake struck at 1:55 a.m. (3:55 p.m. ET), about 163 miles (262 km) north of Port Blair, Andaman Islands, and 225 miles south-southwest of Pathein, Myanmar, according to the U.S. Geological Survey.

Its focus was about 20 miles below the Earth’s surface. In general, earthquakes centered closer to the Earth’s surface produce stronger shaking and can cause more damage than those further underground.

“Earthquakes of this size have the potential to generate a destructive local tsunami and sometimes a destructive regional tsunami along coasts located usually no more than a thousand kilometers from the earthquake epicenter,” said the bulletin from the tsunami warning center.

“It is not known that a tsunami was generated. This watch is based only on the earthquake evaluation. Authorities in the region should take appropriate action in response to this possibility.”

The estimated tsunami travel time would be an hour or less to the coasts of the Andaman and Nicobar islands, according to a bulletin issued by the Japan Meteorological Agency.

Please read the full article at CNN- Tsunami watch issued after Indian Ocean quake – CNN.com.

Latest Watch Information for USGS –

TSUNAMI BULLETIN NUMBER 003
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 2124Z 10 AUG 2009

THIS BULLETIN FOR ALL AREAS OF THE INDIAN OCEAN.

CORRECTION TO PREVIOUS BULLETIN #2: 

NO TSUNAMI HAS YET BEEN OBSERVED

... A REGIONAL TSUNAMI WATCH IS IN EFFECT ...

A TSUNAMI WATCH IS IN EFFECT FOR

 INDIA / MYANMAR / INDONESIA / THAILAND / BANGLADESH

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

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 -  1956Z 10 AUG 2009
 COORDINATES -  14.1 NORTH   93.0 EAST 
 LOCATION    -  ANDAMAN ISLANDS  INDIA REGION
 MAGNITUDE   -  7.7

EVALUATION

 EARTHQUAKES OF THIS SIZE HAVE THE POTENTIAL TO GENERATE A           
 DESTRUCTIVE LOCAL TSUNAMI AND SOMETIMES A DESTRUCTIVE REGIONAL      
 TSUNAMI ALONG COASTS LOCATED USUALLY NO MORE THAN A THOUSAND        
 KILOMETERS FROM THE EARTHQUAKE EPICENTER. AREAS FURTHER FROM THE    
 EPICENTER COULD EXPERIENCE SMALL SEA LEVEL CHANGES AND STRONG OR    
 UNUSUAL COASTAL CURRENTS.                                           

 HOWEVER - IT IS NOT KNOWN THAT A TSUNAMI WAS GENERATED. THIS        
 WATCH IS BASED ONLY ON THE EARTHQUAKE EVALUATION. AUTHORITIES IN    
 THE REGION SHOULD TAKE APPROPRIATE ACTION IN RESPONSE TO THIS       
 POSSIBILITY. THE WATCH WILL NOT EXPAND TO OTHER AREAS OF THE        
 INDIAN OCEAN UNLESS ADDITIONAL DATA ARE RECEIVED TO WARRANT SUCH    
 AN EXPANSION.                                                       

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
 --------------------------------    ------------    ------------
 INDIA            NORTH ANDAMAN      13.3N  92.6E    2021Z 10 AUG
                  LITTLE ANDAMAN     10.7N  92.3E    2053Z 10 AUG
                  PORT BLAIR         11.9N  92.7E    2121Z 10 AUG
                  GREAT NICOBAR       7.1N  93.6E    2136Z 10 AUG
                  KAKINADA           17.2N  82.7E    2205Z 10 AUG
                  BALESHWAR          21.6N  87.3E    2231Z 10 AUG
 MYANMAR          PYINKAYAING        15.9N  94.3E    2047Z 10 AUG
                  CHEDUBA ISLAND     18.9N  93.4E    2100Z 10 AUG
                  SITTWE             20.0N  92.9E    2135Z 10 AUG
                  MERGUI             12.8N  98.4E    2243Z 10 AUG
                  YANGON             16.5N  96.4E    2321Z 10 AUG
 INDONESIA        BANDA ACEH          5.5N  95.1E    2204Z 10 AUG
 THAILAND         PHUKET              8.0N  98.2E    2244Z 10 AUG
                  KO PHRA THONG       9.1N  98.2E    2257Z 10 AUG
                  KO TARUTAO          6.6N  99.6E    0012Z 11 AUG
 BANGLADESH       CHITTAGONG         22.7N  91.2E    2340Z 10 AUG

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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