A quake of magnitude 8.6 struck Sumatra at Wednesday, April 11, 2012 at 02:38:37 PM at local time and produced a ground shaking for up to five minutes. It was reported that after two hours an aftershock of magnitude 8.2 produced a renewal of previously superseded tsunami warning after main shock. The aftershock lasted four minutes.
This quake was unlike those seen off Indonesia in recent years, where ground had been pushed under the continental plate, "flipping up" the seabed. It seems to be a large earthquake within the Indian Plate and the plate has broken in a sort of lateral way. It's a sort of tearing earthquake, and this is much less likely to cause a tsunami because it's not displacing large volumes of water. Still no reports of damage or casualties are declared by local government.
The main shock was centered at a depth of 33km (20 miles), about 495km from Banda Aceh, the provincial capital.
Among many aftershocks(so far 18 aftershocks have been recorded) the major shock 8.2 struck 16km (10 miles) beneath the ocean floor and 615km from Banda Aceh.
Singapore, Thailand, Sri Lanka, Malaysia, Bangladesh and India are also felt a fraction of this massive quake.
There were no immediate reports of casualties or damage in Bangladesh. According to Meteorological Department the earthquake was felt at 2:38:30pm in Bangladesh.
The response of Bangladeshi people expressed in Modified Mercalli Intensity (MMI) scale and distance from epicenter are listed below:
Country
|
Region
|
MMI
|
Distance from
Epicenter
|
Bangladesh
|
Chittagong
|
3
|
2218
|
Bangladesh
|
Dhaka
|
3
|
2383
|
Bangladesh
|
Noakhali
|
2
|
2277
|
Bangladesh
|
Narayanganj
|
3
|
2373
|
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