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Wednesday, April 11, 2012

NATURE SPARES INDIAN OCEAN! TSUNAMI WATCH LIFTED

**** TSUNAMI WATCH LIFTED FROM ALL THE AREAS OF THE INDIAN OCEAN***

**** UNCERTAINTY EXSIST WHETHER THERE WAS A TSUNAMI IN THAILAND ****

**** MULTIPLE LOW INTENSITY AFTERSHOCKS REPORTED AT OFFSHORE WEST COAST OF NORTH SUMATRA***

AKG Seismology Team-

A Major Sigh of Relief!! The Pacific Tsunami Warning Center has lifted the TSUNAMI WATCH from all the areas where it was issued- 

As per the datas from PTWC, A maximum recorded Tsunami height was 3.5ft at Meulaboh,Indonesia. Here is the report- 

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

 GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
 -------------------  ----- ------  -----  ---------------  -----
 MALE MV               4.2N  73.5E  1223Z   0.19M /  0.6FT  06MIN
 GAN MV                0.7S  73.2E  1212Z   0.03M /  0.1FT  48MIN
 HANIMAADHOO MV        6.8N  73.2E  1235Z   0.25M /  0.8FT  06MIN
 PADANG ID             1.0S 100.4E  1208Z   0.09M /  0.3FT  34MIN
 KO TAPHAO NOI TH      7.8N  98.4E  1143Z   0.05M /  0.2FT  06MIN
 ENGGANO ID            5.3S 102.3E  1104Z   0.12M /  0.4FT  04MIN
 TRINCONMALEE LK       8.6N  81.2E  1129Z   0.06M /  0.2FT  16MIN
 TELUKDALAM ID         0.6N  97.8E  1044Z   0.22M /  0.7FT  14MIN
 COCOS ISLAND AU      12.1S  96.9E  1102Z   0.08M /  0.3FT  18MIN
 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

 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.

However as was mentioned by AKG, Tsunami wave was generated and it reached places like Maldives,Thailand,Australia,Sri Lanka parts ( shown in PINK) in above region in additions to Indonesia.

However at these areas excluding Indonesia region not more than 1 feet of Tsunami wave was reported. The maximum was 1.06M at Meulaboh,Indonesia for 12min at 1007hrs UTC
Disaster preparedness was in full swing across 28 nations including India where people where forced to evacuate areas in Andaman and Nicobar Islands

Its obvious that a significant Tsunami was generated but location remains uncertain!

As of now, Multiple aftershocks have been reported around the epicenter region as shown by the below image

10-degree map showing recent earthquakes
Above- Each Square represents an Earthquake ( or aftershock) The two BIG BLUE SQUARES are the first earthquake (8.6M) and the aftershock of 8.2M... 

THE BIG QUESTION- WHY THERE WAS NO DESTRUCTIVE TSUNAMI??


AKG's Earthquake Expert Aluth Fian informed that this Earthquake was caused due to a transform fault which rarely generate tsunami, because tsunami is mainly resulted from height change dz -> connection to wave equation. 

Thus the plates had more horizontal movement than vertical and hence NO SIGNIFICANT Tsunami was generated. If it hadn't been the Transform Fault responsible then a significant Tsunami would had generated and quite similar to 26th Dec 2004 Event.. 


Aluth Fian shall update on the science behind this soon!


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