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M5.8 Myanmar-India Border, 2011

Date:

21 November 2011

Epicentre:

NW of Namkhansi, Sagaing

Time:

03:15:43 UTC  

Latitude:

24.947 N (PDE)

Longitude:

95.226 E (PDE)

Depth:

121 kms (PDE)

Magnitude:

Mw=5.8 (HRV), 5.7 (PDE)

Additional Info


Map Disclaimer


A moderate earthquake (M5.0 to 5.9 termed as "moderate") occurred beneath the upper Myitkyina river valley along the Myanmar-India border, on 21 November 2011 at 08:45 AM local time in India and 09:15 AM local time in Bangladesh. It had a magnitude of Mw=5.8 and caused minor damage in Assam. Due to its depth, this earthquake has been felt in north-east India well as in Bangladesh.

The earthquake was centred 9.3 kms NW of Namkhansi (Sagaing), Myanmar,
30 kms NW of Saingkyu (Sagaing), Myanmar,
60.7 kms E of Chhatrik (Sagaing), Myanmar,
84.3 kms NE of Shwelobo (Sagaing), Myanmar,
131 kms ENE of Imphal (Manipur), India,
138 kms ESE of Kohima (Nagaland), India,
248 kms E of Silchar (Assam), India,
283 kms S of Dibrugarh (Assam), India,
376 kms ESE of Guwahati (Assam), India,
508 kms ENE of Dhaka (Dhaka), Bangladesh,
749 kms NE 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 was widely felt in north-east India in the states of Assam, Arunachal Pradesh, Manipur, Meghalaya, Mizoram and Nagaland. Buildings developed cracks in eastern Assam and strong tremors were felt at Jorhat, Golaghat, Guwahati and Tezpur among other places. In Tezpur, people were woken up by the tremor that was accompanied by a loud noise. In Arunachal Pradesh it was felt at Namsai. In Nagaland, people ran outdoors at Dimapur. It was also felt to a lesser extent at Kohima and Mokokchung. Mild tremors were felt at Siliguri in north Bengal and as far as Kolkata in West Bengal, India. In Bangladesh, tremors were felt in some parts of the country including at Dhaka, Sunamganj and Sylhet. In Sylhet, people went outdoors when the earthquake struck.

This is the largest earthquake in this general area since 4 February 2011 when a Mw=6.4 earthquake occurred along the India-Myanmar border. The GFZ and NEIC moment tensor solutions implicate a thrust fault with a small strike-slip component.

GFZ Event gfz2011wufl
11/11/21 03:15:42.85
Depth 111         No. of sta: 75
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.86       Mtt=-2.81
  Mpp=-1.05       Mrt=-0.97
  Mrp=-1.54       Mtp=-2.81
Principal axes:
  T  Val=  4.66  Plg=66  Azm=123
  N       -0.27      24      305
  P       -4.39       1      215

Best Double Couple:Mo=4.5*10**17
 NP1:Strike=147 Dip=50 Slip= 122
 NP2:       283     49        58

 

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References
01) National Earthquake Information Centre (PDE), Golden, USA.
02) India Meteorological Department (IMD), Delhi, India.
03)
Geo Forschungs Zentrum (GFZ), Potzdam, Germany.
04)
Macroseismic information has been compiled by the ASC from reports by local media and local NGO personnel.

Page Citation
Information on this page may be reproduced in print or electronically but it is requested that a citation be given to this website in the form of a link i.e. "www.asc-india.org".

Map Disclaimer
International boundaries of India (especially Arunachal Pradesh, Jammu & Kashmir, Himachal Pradesh and Uttarakhand) on the displayed map are from Google Maps. These do not conform to the external boundaries of India recognized by the Survey of India. That they are displayed on this page via Google Maps, is only for display purposes and this should not be misinterpreted as an endorsement of these boundaries by the Amateur Seismic Centre (ASC).

Page Updated: 23 Nov 2011 | Website Disclaimer

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