After a M8.7 earthquake off the cost of Northern Sumatra and issue of a Tsunami Warning for the whole of the Indian Ocean, the warning has finally been lifted with the follwing additional message.
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.
Thanks to Pacific Tsunami Warning Center
http://ptwc.weather.gov/ptwc/text.php?id=indian.TSUIOX.2012.04.11.1318
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.
For a regional map showing latest earthquakes in real time follow this link to USGS website.
Some detailed scientific information regarding the Sumatra earthquake can be seen at the following websites:
http://earthquake.usgs.gov/earthquakes/eventpage/usc000905e#summary
http://www.seismology.harvard.edu/research_sumatra2012.html
http://www.earthobservatory.sg/media/news-and-features/Sumatra_Earthquake_11Apr2012.html
For a regional map showing latest earthquakes in real time follow this link to USGS website.
Some detailed scientific information regarding the Sumatra earthquake can be seen at the following websites:
http://earthquake.usgs.gov/earthquakes/eventpage/usc000905e#summary
http://www.seismology.harvard.edu/research_sumatra2012.html
http://www.earthobservatory.sg/media/news-and-features/Sumatra_Earthquake_11Apr2012.html
