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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. |
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References
01)
National
Earthquake Information Centre (PDE),
Golden, USA.
02) 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.
06)
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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of these boundaries by the Amateur Seismic Centre (ASC). |
