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M7.2 Indian Ocean (West of Sumatra), 2012

Date:

10 January 2012 (UTC)

Epicentre:

W of Laban, Pulau Simuelue

Time:

18:37:01 UTC (17:02:06 PST)

Latitude:

02.396 N (PDE)

Longitude:

93.175 E (PDE)

Depth:

29.1 kms (PDE)

Magnitude:

Mw=7.2 (PDE), 7.1 (HRV)

Additional Info


 

Map Disclaimer


A major earthquake (M7.0-7.9 termed as "major") occurred in the Indian Ocean to the west of the island of Sumatra in Indonesia, on 11 January 2012 at 01:37 AM local time (WIT) in Indonesia or 00:07 AM in the Nicobar Islands, India. It had a magnitude of Mw=7.2.

This earthquake was centre
d 290 kms W of Laban (Pulau Simuelue, Sumatra), Indonesia,
381 kms SW of Meulaboh (Sumatra), Indonesia,
424 kms SSW of Banda Aceh (Sumatra), Indonesia,
503 kms SSW of Campbell Bay (Nicobar Islands), India,
508 kms NW of Gunungsitoli (Sumatra), Indonesia,
882 kms NW of Padang (Sumatra), Indonesia,
953 kms W of Kuala Lumpur, Malaysia,
1034 kms S of Port Blair (Andaman Islands), India,
1561 kms ESE of Colombo, Sri Lanka,
1854 kms SE of Chennai (Tamil Nadu), India.

If you felt this earthquake please click here to let us know

Tremors have been felt in parts of Sumatra, Indonesia in the provinces of Nanggroe Aceh Darussalam, Sumatera Utara, Sumatera Barat, Bengkulu and Lampung. Strong tremors were felt for a long duration on the island of Simuelue nearest to the epicentre causing panic. The earthquake was strong and caused panic at Meulaboh in Aceh Barat where people went outdoors. Tremors lasting as long as a minute were felt by people awake at the time in Banda Aceh and the rest of Aceh Besar. People went outdoors in Banda Aceh including in the Darussaalam and Lamgugob in Syiah Kuala district and in the Ulee Kareng district.

Shaking was experienced as far as Malaysia, Singapore and Sri Lanka. In Malaysia the earthquake was felt in Kedah, Perak and Pinang. There are no reports yet of the effects of this earthquake in the Nicobar Islands, India. In isolated instances, mild tremors were felt by individuals at Dhaka, Bangladesh and at Cuttack in Odisha, India.

There was some panic in Aceh province in Indonesia, especially in the capital, Banda Aceh. Residents in coastal areas such as Keutepang, Lambaro, Mata Ie, Pante Pirak, Peuniti, Simpang Surabaya and Ulee Lhue fled to higher ground fearing a tsunami. Many residents continued to seek shelter on the Pante Pirak Bridge hours after the tsunami warning was lifted. Residents in the Geulumpang and Lampaseh areas in the city also spent the night outdoors. In coastal areas such as Meulaboh and the Nagan Raya regency people hurried to higher ground in panic. The residents of the island of Simuelue were also reported to have been on alert for a possible tsunami.

This earthquake appears to have occurred within the Indian Plate at a depth of ~30-kilometres. The MT and CMT solutions indicate a predominance of strike-slip faulting. Due to the style of faulting and the location of this earthquake, the chances of a tsunami in the Indian Ocean were lower than would have been the case, had this earthquake occurred along the subduction interface to the east. Nevertheless, eyewitnesses in Meulaboh reported a drop in the sea level that was later confirmed by the local disaster management authority, BPBD.

A local tsunami warning was issued in Indonesia but was lifted two hours later. A tsunami advisory was also issued by INCOIS immediately after the earthquake. A final bulletin followed after no significant tsunami was observed by tide gauges monitored by them with the caveat that local conditions could cause significant variations in observed tsunami activity.

GCMT EVENT: C201201101837A 
CENTROID LOCATION:
ORIGIN TIME:      18:37:13.2 0.1
LAT: 2.51N 0.00;LON: 92.99E 0.00
DEP: 14.2  0.4;TRIANG HDUR:  9.6
MOMENT TENSOR: SCALE 10**26 D-CM
RR=-0.432 0.023; TT=-2.870 0.020
PP= 3.300 0.023; RT=-1.850 0.119
RP=-1.400 0.117; TP=-6.010 0.020

PRINCIPAL AXES:
1.(T) VAL=  6.978;PLG= 2;AZM= 59
2.(N)       0.335;    71;    154
3.(P)      -7.315;    19;    328

BEST DBLE.COUPLE:M0= 7.15*10**26
NP1: STRIKE=105;DIP=76;SLIP=-168
NP2: STRIKE= 12;DIP=78;SLIP= -15

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References
01) National Earthquake Information Centre (PDE), Golden, USA.
02) Harvard Centroid Moment Tensor Solution (HRV), Harvard, USA.
03) Macroseismic information has been compiled by the ASC from reports by local media and local NGO personnel.

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Map Disclaimer
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Page Updated: 13 Jan 2012 | Website Disclaimer

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