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A strong
earthquake (M6.0 to 6.9 termed as "strong") occurred
beneath the upper Myitkyina river valley along the Myanmar-India
border,
on 4 February 2011
at 19:25 PM local time in India and 20:05 PM
local time in Bangladesh. It had a magnitude of Mw=6.4 and
killed one person. Due
to its depth, this earthquake has been extensively felt in
north-east India, northern and central Myanmar as well as in
Bangladesh. This is the largest earthquake in this general area
since 1995.
The earthquake was centred
4 kms NW of
Myene (Sagaing), Myanmar,
24 kms ENE of Shwelobo (Sagaing), Myanmar,
40 kms SE of Chhatrik (Manipur), India,
87 kms E of Imphal (Manipur), India,
134 kms SE of Kohima (Nagaland), India,
200 kms E of Silchar (Assam), India,
320 kms S of Dibrugarh (Assam), India,
325 kms NW of Mandalay (Mandalay), Myanmar,
348 kms SE of Guwahati (Assam), India,
413 kms N of Chauk (Magway), Myanmar,
453 kms ENE of Dhaka (Dhaka), Bangladesh,
532 kms NNE of Sittwe (Rakhine), Myanmar,
690 kms ENE of Kolkata (West Bengal), India.
If you felt this earthquake, please take the time to fill out a felt report questionnaire.
Due to the depth of this
earthquake it has been widely felt in north-east India, northern and
central Myanmar as well as in Bangladesh.
At least one person died
in the Monywa area in Sagaing division, Myanmar. Several buildings
and bridges were also damaged in this area. Strong tremors were also
felt at Maungdaw in Rakhine division.
Severe tremors were felt
at the Moreh-Tamu border crossing on the Myanmar-India border where
people found it difficult to walk, heavy furniture was shaken and
animals outdoors were frightened according to felt reports received
by this website. Very strong shaking was felt in the Manipur valley
including Imphal. Many people ran outdoors in panic and buildings
shook in the earthquake that lasted two minutes. Electricity poles
were downed in Churachandpur district leading to power cuts. Window
panes at the Manipur Secretariat were damaged in Imphal. At Kumbhirgram in south Assam, heavy furniture shifted on the ground
floor and the earthquake was felt by everyone. Buildings developed
hairline cracks at Silchar in Assam and at Dimapur in Nagaland.
This earthquake was felt widely in north-east India, including at
Guwahati and Kumbhirgram in Assam, at Itanagar in Arunachal Pradesh,
at Shillong and Tura in Meghalaya, at Dimapur in Nagaland.
It was also felt in the states of Mizoram and Tripura. In eastern India, it was felt in parts of West Bengal including at
Malda, Murshidabad, Nadia, North Dinajpur, Shiliguri and South
Dinajpur. The earthquake was also perceptible in tall buildings
as far as Kolkata in West Bengal and Bhubaneswar in Orissa. In
Kolkata, a person on the 12th floor of a building felt tremors for
close to three minutes and saw hanging objects moving. People
working late in high-rise buildings in Newtown and Salt Lake went
outdoors. In Bihar, it was felt at Patna and Purnea. Tremors were
also felt in Jharkhand.
In Bangladesh, the
earthquake was felt widely in the capital, Dhaka including in the
suburbs of Agargaon, Baridhara, Gulshan, Saver and Uttara according
to felt reports received by this website. Elsewhere in Bangladesh,
it was strong at Barisal, Chittagong, Gopalganj, Munshiganj,
Noakhali, Sirajganj and Sylhet where people ran outdoors in panic.
It was also strongly felt in the Chittagong Hill Tracts. Mild tremors were also felt
in Dinajpur and Mymensingh. People were felt the earthquake indoors
and were frightened at Bagerhat, Bandarban, Bhola, Feni, Gaibandha,
Gazipur, Rajshahi and Rangpur. It was also felt in Baguda, Chandpur,
Choudagram, Jamalpur, Khulna, Lakshmipur, Narsinghdi and Sunanganj.
This is the largest
earthquake in this general area since 6 May 1995 when a Mw=6.4
earthquake along the India-Myanmar border occurred to the north of
the earthquake on 4 February 2011. The earthquake in 1995 was widely
felt across the same region. Intermediate depth earthquakes in this general area
are not unusual. The GFZ, HRV and NEIC moment tensor solutions show the greatest seismic moment release occurred on a thrust
fault with a strike-slip component.
GFZ Event
gfz2011cldo
11/02/04 13:53:46.52
Depth 62
No. of sta: 25
Moment Tensor; Scale 10**18 Nm
Mrr= 1.95 Mtt=-2.30
Mpp= 0.35 Mrt= 0.46
Mrp=-2.10 Mtp=-2.30
Principal axes:
T Val= 3.42 Plg=54 Azm= 97
N -0.20
32 310
P -3.22
16 210
Best Double Couple:Mo=3.3*10**18
NP1:Strike=144 Dip=68 Slip= 125
NP2: 263 40
36
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