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M6.5 Invisible Bank earthquake, Andaman Sea


31 May 2010 *UTC*


E of Invisible Bank


19:51:49 UTC  


11.119 (PDE)


93.698 E (PDE)


127.7 kms (PDE)


Mw 6.5 (HRV), 6.4 (PDE)

Additional Info

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A strong earthquake (M6.0-6.9 termed as "strong") struck the Andaman Sea in the vicinity of Invisible Bank on 1 June 2010 at 01:21 IST or 01:51 BST. The earthquake had a magnitude of Mw=6.5 and due to its depth was felt as far as the east coast of India.

If you felt this earthquake in India, Myanmar, Bangladesh or Thailand, please let us know!

The earthquake was centred 120 kms SE of Port Blair (South Andaman Island), India,
150 kms ENE of West Bay (Little Andaman Island), India,
237 kms NE of IAF Malacca (Car Nicobar Island), India,
466 kms N of Campbell Bay (Great Nicobar Island), India,
680 kms SSW of Yangon (Yangon), Myanmar,
1,377 kms SSE of Kolkata (West Bengal), India,
1,469 kms SSE of Dhaka (Dhaka), Bangladesh,
1,477 kms E of Chennai (Tamil Nadu), India.

This earthquake was located in the vicinity of Invisible Bank to the south-east of Port Blair, India. Based on its location and depth, it more than likely was associated with slip on the interface between the Indian Plate and the Burmese Micro-plate or due to slip on faults within either of the two aforementioned plates. Since this earthquake was located out to sea and also due to its focal depth (Z=127.7 kms) was been felt strongly in the southern Andaman Islands. Residents of Port Blair were shaken awake by the quake and many people went outdoors in fear. Tremors were also felt as far as Chennai in Tamil Nadu, Bhubaneswar and Cuttack in Orissa, Kolkata in West Bengal and at Vishakhapatnam in Andhra Pradesh as well as at Dhaka and Khulna, Bangladesh. In Kolkata, tremors were strong enough to wake up a few sleeping people in multi-storied buildings.

Due to the depth of this earthquake, the likelihood of a tsunami is negligible. An automated message was generated for this event by INCOIS. The PTWC did not issue watches or warnings for the Indian Ocean basin but did remark on the minimal possibility of a local tsunami.

This earthquake is one of the largest intermediate depth earthquakes in the region of the Andaman & Nicobar Islands in twenty-seven years. On 24 January 1983, a Mw=6.8 earthquake occurred at a depth of 80.5 kilometres and was located in the Andaman Sea to the east of North Andaman Island. Tremors from this earthquake were felt as far as Chittagong in Bangladesh as well as at Bhubaneswar and Kolkata in India. Significant intermediate depth earthquakes have occurred historically namely in 1914 (MS=7.2), 1925 (MS=6.5), 1928 (MS=6.2), 1937 (MS=6.0), 1938 (MS=6.2), 1941 (MS=6.2), 1964 (Mb=6.3), 1971 (Mb=5.9) and 1983 but without re-visiting data from these events a comparison with this latest earthquake would be unjustified.

01) National Earthquake Information Centre (PDE), Golden, USA.

India Meteorological Department (IMD), Delhi, India.
03) Geological Survey of India (GSI), Kolkata, India
04) Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, India.
05) International Seismological Centre (ISC), Berkshire, U.K.
Harvard Centroid Moment Tensor Solution (HRV), Harvard, USA.
07) Macroseismic information has been compiled by the ASC from reports by local media and local NGO personnel

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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: 13 Jun 2010 | Website Disclaimer

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