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A light
earthquake (M4.0-4.9 termed as light)
occurred in the Mirjapur-Tangail area of central Bangladesh,
on 20 September
2008 at 17:52 PM
local time in Bangladesh. It had
a magnitude of
ML=4.4 and was
felt in many parts of the Dhaka division as well as in the
capital, Dhaka. This earthquake was
preceeded and followed by several smaller tremors, some of which
were also felt in the region.
If you felt this
earthquake please take the time to add your report to a
"felt" map.
The earthquake was centred
9 kms WSW of Betail (Dhaka), Bangladesh),
24.2 kms ESE of Tangail (Dhaka), Bangladesh),
35 kms ENE of Daulatpur (Dhaka), Bangladesh),
40 kms NW of Tongi (Dhaka), Bangladesh),
54 kms NW of Dhaka (Dhaka), Bangladesh),
56 kms ESE of Sirajganj (Rajshahi), Bangladesh,
77 kms WSW of Kishorganj (Dhaka), Bangladesh),
92.5 kms SSE of Jamalpur (Dhaka), Bangladesh),
150 kms NNE of Khulna (Pabna), Bangladesh,
265 kms NNW of Chittagong (Chittagong), Bangladesh.
A series of mild to
light tremors were felt in central and southern parts of Dhaka
division in central Bangladesh on 20 September and the following
day. The first event, a ML=3.6 was recorded by the Dhaka
University Seismic Network at 17:15 BST (11:14 UTC), a ML=3.0
event at 17:42 BST (11:42 UTC) and was followed with 30-minutes by
a stronger ML=4.4 event. This earthquake was then followed quickly
by a ML=3.9 event at 18:01 BST (12:01 UTC) and thereafter by 7
mild tremors until 09:13 BST (03:13 UTC) on 21 September. At least
two further unrecorded tremors were felt between ~17:22 and ~17:30
BST at Dhaka, Faridpur and Narayanganj.
|
Date |
BST |
M |
T |
Location |
|
21sep08 |
09:13:14 |
2.7 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
21sep08 |
08:29:48 |
2.5 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
21sep08 |
07:55:28 |
3.7 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
21sep08 |
05:03:23 |
2.7 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
21sep08 |
04:54:15 |
3.0 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
20sep08 |
22:16:34 |
2.2 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
20sep08 |
18:21:41 |
2.7 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
20sep08 |
18:01:01 |
3.9 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
20sep08 |
17:52:00 |
4.4 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
20sep08 |
17:42:46 |
3.0 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
|
20sep08 |
~17:30 |
n/a |
- |
- Felt locally - |
|
20sep08 |
~17:22 |
n/a |
- |
- Felt locally -
|
|
20sep08 |
11:16:36 |
3.6 |
ML |
Mirjapur-Tangail
region (Dhaka), Bangladesh |
Given the short
intervals between the tremors, most of which were felt, it is
difficult to differentiate the shaking that were reported at
multiple times. Several of the tremors were felt in Dhaka as well
as other cities and towns in the region. Three felt reports received
from the Dhaka region indicated an EMS intensity of 3 in the Gulshan and Uttara areas of the city. Elsewhere in the city, some
buildings are thought to have developed cracks. Although the
intensity of the earthquake was not high in Dhaka, many people
went outdoors fearing a larger earthquake given the number of
tremors that were felt within minutes of each other. Tremors were
also felt at Faridpur, Madaripur, Munshiganj, Narayanganj, Tangail
and even as far south as Chandpur. Seismic seiches were observed
in canals, rivers and ponds as a result of the tremors in
Madaripur district. |
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References
01)
Dhaka University Seismic Network (DUSNET), Dhaka,
Bangladesh.
02) India Meteorological Department (IMD),
Delhi.
03) Macroseismic information has been compiled by
the ASC from reports by local media and local NGO personnel.
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