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A strong
earthquake (red star) occurred in the eastern Bay of Bengal
to the west of South Sentinal Island, India, on 27
June 2008 at 17:10 PM
local time. It had a magnitude of
Mw=6.6
and was felt in many parts of the Andaman Islands.
Tremors were also felt on the Coromandel Coast in the Chennai
metropolitan area in Tamil Nadu, India. It was followed by another
strong earthquake of Mw=6.1 on 28 June (yellow star).
The earthquake on 27 June was centred
49 kms WSW of South Sentinal Island, India,
66 kms WNW of Jackson Creek (Little
Andaman Island), India,
87 kms WNW of Hut Bay (Little Andaman Island), India,
106 kms SW of Jahaj (Rutland Island), India,
139 kms SW of Port Blair (South Andaman Island), India,
221 kms NNW of IAF Malacca (Car Nicobar Island), India,
491 kms NNW of Campbell Bay (Great Nicobar Island), India,
1225 kms SE of Bhubaneswar (Orissa), India,
1277 kms E of Chennai (Tamil Nadu), India.
If you felt these
events, please take the time to fill out a felt report questionnaire.
Tremors from this earthquake
strongly felt in the
Andaman Islands where people rushed outdoors in panic. Power
supply was cut as a precautionary measure and later restored.
Tremors were also felt along the east coast of India in the city
of Chennai, Tamil Nadu. Distinct tremors from the earthquake at
17:10 IST were felt by people in high-rise buildings and in a few
instances people went outdoors. In the city, the earthquake was
felt at Ambattur, Gopalapuram, Kodambakkam, Koyambedu, Mylapore,
Nandanam, Nungambakkam, Padi, T. Nagar and Vadapalani. Tremors
were also felt by people outdoors at ground
level. Minutes after the tremor, power supply was disrupted in
many parts of the city, including Anna Nagar, Ashok Nagar,
Sowcarpet, Vadapalani and Virugambakkam.
The event at 17:10 IST
on 27 June 2008 was the largest with a magnitude of Mw=6.6.
At least 24 aftershocks of M>4.5 were recorded until 30 June
(listed below). These
included a Mw=5.7 at 18:37 IST (13:07 UTC) on 27 June as well as a
Mw=6.1 at 18:24 IST (12:54 UTC) and a Mb=5.7 at 21:59 IST ((15:29
UTC) on 28 June. Earthquakes in the magnitude range of Mw=7.0 or
above that originate in the vicinity of the Andaman & Nicobar
Islands have historically been felt on the east coast of India
including a few earthquake below this range. The last occurrence
was on 24 July 2005 when a
Mw=7.3 earthquake near Teresa Island
in the Nicobar Islands was felt along much of the Coromandel Coast
of India as well as in Sri Lanka.
|
Day |
UTC |
M |
T |
Lat. |
Long. |
Z |
Location |
Net. |
|
30jun |
02:10 |
4.9 |
Mb |
11.32 |
91.68 |
33.0 |
54.1 kms W of
Rutland Island |
2 |
|
29jun |
04:38 |
4.6 |
Mb |
10.30 |
91.82 |
33.0 |
64 kms WSW of
Point Alcock, Little Andaman |
2 |
|
29jun |
04:14 |
5.0 |
Mb |
10.75 |
91.63 |
10.0 |
68.3 kms WSW of
South Sentinal Island |
3 |
|
29jun |
00:32 |
5.0 |
Mb |
10.99 |
91.73 |
10.0 |
53 kms W of South
Sentinal Island |
3 |
|
28jun |
20:18 |
4.9 |
Mb |
10.91 |
91.86 |
33.0 |
40 kms WSW of
South Sentinal Island |
2 |
|
28jun |
17:17 |
4.7 |
Mb |
10.85 |
91.89 |
28.5 |
38 kms WSW of
South Sentinal Island |
3 |
|
28jun |
15:55 |
5.3 |
Mb |
10.74 |
91.89 |
33.0 |
44.3 kms WSW of
South Sentinal Island |
2 |
|
28jun |
15:29 |
5.4 |
Mb |
10.81 |
91.85 |
33.0 |
44
kms WSW of South Sentinal Island |
3 |
|
28jun |
14:30 |
4.7 |
Mb |
10.84 |
91.87 |
35.0 |
40.3 kms WSW of
South Sentinal Island |
3 |
|
28jun |
13:57 |
5.0 |
Mb |
10.73 |
91.69 |
10.0 |
63 kms WSW of
South Sentinal Island |
3 |
|
28jun |
13:52 |
4.5 |
Mb |
10.85 |
91.93 |
33.0 |
34.1 kms WSW of
South Sentinal Island |
2 |
|
28jun |
13:31 |
4.8 |
Mb |
10.83 |
91.94 |
33.0 |
34.1 kms WSW of
South Sentinal Island |
2 |
|
28jun |
13:13 |
4.8 |
Mb |
10.80 |
91.96 |
33.0 |
31 kms SW of South
Sentinal Island |
2 |
|
28jun |
12:54 |
6.1 |
Mw |
10.59 |
91.75 |
11.7 |
65.8 kms SW of South Sentinal Island |
3 |
|
28jun |
04:35 |
5.1 |
Mb |
10.89 |
91.74 |
26.8 |
52 kms WSW of
South Sentinal Island |
3 |
|
28jun |
03:26 |
4.9 |
Mb |
10.88 |
91.91 |
28.3 |
34.6 kms WSW of
South Sentinal Island |
3 |
|
27jun |
19:19 |
5.2 |
Mb |
11.17 |
91.68 |
33.0 |
62.6 kms WNW of
South Sentinal Island |
2 |
|
27jun |
18:05 |
5.2 |
Mb |
10.89 |
91.85 |
25.7 |
40.4 kms WSW of
South Sentinal Island |
3 |
|
27jun |
15:00 |
4.8 |
Mb |
11.68 |
92.03 |
33.0 |
23.1 kms NW of
North Sentinal Island |
2 |
|
27jun |
14:54 |
4.5 |
Mb |
11.62 |
91.57 |
33.0 |
60 kms W of North
Sentinal Island |
2 |
|
27jun |
14:36 |
4.7 |
Mb |
10.81 |
91.79 |
33.0 |
50.3 kms WSW of
South Sentinal Island |
2 |
|
27jun |
13:07 |
5.7 |
Mw |
10.85 |
91.67 |
10.0 |
60.7 kms WSW of South Sentinal Island |
3 |
|
27jun |
12:29 |
4.8 |
Mb |
10.97 |
92.03 |
33.0 |
20.3 kms W of
South Sentinal Island |
2 |
|
|
References
01) India Meteorological Department (IMD), Delhi.
02)
Geophysical Survey
of the Russian Academy of Sciences, Obninsk, Russia (GSR).
03) National
Earthquake Information Centre, Golden, CO, USA
(NEIC/PDE).
04)
Macroseismic information has been compiled by
the ASC from reports by local media and local NGO personnel.
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