Post Earthquake Cruise to Interview
Island - Jan, 2006
Plate tectonics & Earthquakes, Tectonics in the Andaman, History of Tsunami in Bay of Bengal
A great shallow foci earthquake of magnitude 9.0 occurred with epicentre (3.298° N, 95.779° E) close to the western boundary of northern Sumatra on 26th December (00:58:50 UTC), 2004 [source: USGS] at a focal depth of 30 km. The epicentre is located on the underlying Indian Plate. A number of aftershocks has already been recorded and distributed north of the mainshock along the Andaman- Nicobar arc-trench gap. Due to this earthquake massive tsunami was generated that caused extensive destruction all along the east coast of India and the Andaman- Nicobar islands. Apart from the tsunami generated casualties, it is also likely that direct earthquake induced damages (aftershocks) has also affected the Andaman and Nicobar group of islands. The earthquake took place in most active seismic region characterised by tectonic features of North South trending Indo-Burma ranges in the north, Andaman-Nicobar islands and the Sumatra fault system in the southeast. According to the available fault plane solutions (USGS and HRVD) the event took place beacuse of thrust type of movement.
Records
at GSI observatory & Post-earthquake survey
Records from GSI broadband seismic observatory
in Jabalpur*, MadhyaPradesh
Records from GSI observatory at Nagpur*, Maharashtra
* The parameters computed are based on single station data and subject to possible subsequent modifications