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M7.5 Off Teressa Island, 2010


12 June 2010 *UTC*


SW of Teressa Island


19:26:50 UTC  


07.748 (PDE)


91.938 E (PDE)


35 kms (PDE)


Mw 7.5 (PDE), 7.4 (HRV)

Additional Info

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A major earthquake (M7.0-7.9 termed as "major") occurred in the vicinity of the Nicobar Islands on 13 June 2010 at 00:56 IST or 01:26 BST. The earthquake had a magnitude of Mw=7.5 and has been very widely felt in the Indian sub-continent causing at least one minor injury in Chennai. It did not generate a tsunami although immediately following the earthquake tsunami advisories were issued for much of the Bay of Bengal basin.

If you felt this earthquake, please let us know!

The earthquake was centred 139 kms SSW of Chanumla (Teresa Island), India,
153 kms W of West Bay (Katchal Island), India,
187 kms SW of IAF Malacca Kakana (Car Nicobar Island), India,
233 kms NW of Campbell Bay (Great Nicobar Island), India,
446 kms SSW of Port Blair (South Andaman Island), India,
1404 kms ESE of Chennai (Tamil Nadu), India.

Shaking from this earthquake was felt very strongly throughout the Nicobar Islands. At Campbell Bay it was felt for nearly 10-seconds. People fled their homes in these islands and sought shelter on higher ground fearful of a tsunami. Eyewitnesses on Car Nicobar Island said the shock was of a comparable intensity to the Mw=9.1 Sumatra-Andaman earthquake on 26 December 2004. To the north in the Andaman Islands, tremors were strong at Port Blair where furniture was shaken for nearly 20-seconds. Many people awoke and ran outdoors. Following the earthquake, a power failure cut electricity supplies to Port Blair and the adjacent areas for half an hour adding to the panic. No damage or casualties were reported from any where in the Nicobar Islands or the Andaman Islands as a result of this earthquake.

Outside the Andaman & Nicobar archipelago, this earthquake was felt widely in much of Sri Lanka, in parts of Bangladesh, in Aceh, Indonesia as well as in southern India and along the east coast of India. In Sri Lanka, tremors were reportedly felt for as long as two minutes in some places. Island wide it was felt at Anuradhapura, Badulla, Chilaw, Galle, Kandy, Kantale, Matara, Negumbo and in parts of Colombo such as Maradana and Wellawata. In Bangladesh, mild tremors were felt in Bramanbaria, Chittagong, Comillah, Narayanganj as well as at Baridara, Dhanmondi, Muhammedpur, Mohakhali and Uttara in the capital, Dhaka. In Indonesia, the earthquake was strong and also caused some concern at Banda Aceh, Aceh Besar and on Sabang Island in Sumatra, Indonesia.

On the Indian mainland, the earthquake was felt in parts of the states of Andhra Pradesh, Karnataka, Orissa, Tamil Nadu and West Bengal. In Tamil Nadu, strong tremors were felt in many parts of Chennai such as Adyar, Aminjinkarai, Anna Nagar, Ashok Nagar, Avadi, Besant Nagar, Chintadripet, Choolaimedu, Gopalapuram, Kilpauk, Kodambakkam, Korattur, Kottivakkam, Koyambedu, Mandaveli, Mylapore, Nandanam, Nungambakkam, Pallavaram, Perungudi, Porur, Royahpettah, Santhome, Sholinganallur, Teynampet, Thiruvanmiyur, Triplicane, T-Nagar, Vadapalani and Vepery. People were woken up, several ran outdoors, utensils and household objects were heard rattling, loose objects were displaced, and in some instances hairline cracks developed in walls and ceilings. In an isolated incident a young boy was slightly injured as he and others ran out of their apartment building in Besant Nagar. Elsewhere in the state, tremors were felt at Vedaranyam and at many places in the Kaveri basin.

In Andhra Pradesh, strong tremors were felt in the districts of Chittoor, East Godavari, Krishna, Nellore, Srikakulam and Vishakhapatnam. In the city of Vishakhapatnam, tremors were felt at Akkayapalem, Abid Nagar, Gopalapatnam, Maddipalem, Narsimhanagar and Railway New Colony. The occupants of high-rise buildings felt the strongest tremors and many people ran outdoors despite heavy rains. In Vijayawada, tremors were felt in Benz Circle, Moghulrajapuram, Singhnagar and Veternary Colony. At Tirupati, utensils and loose objects were heard rattling. Tremors were also felt in the towns of Nagari and Puttur where people remained outdoors until 3 AM. In Orissa, the earthquake was felt by the occupants of high-rise buildings in the cities of Bhubaneswar and Cuttack as well as in the district of Khurda. In West Bengal, the earthquake was mainly felt on the upper floors of high-rise buildings in Dum Dum and Jadavpur in the city of Kolkata. In Karnataka as well, reports were isolated to people who were in the upper floors of buildings in places such as C.V. Raman Nagar and Sadashivnagar in Bengaluru.

Given the depth and magnitude of this earthquake the threat of a tsunami existed and a regional tsunami watch was issued by the PTWC for India, Indonesia, Malaysia, Myanmar, Sri Lanka and Thailand. This was later downgraded to a local watch that was limited to the Indian coastline by the PTWC. The Indian tsunami warning centre, INCOIS, issued a local watch for the Andaman & Nicobar Islands but later cancelled it after no significant changes in sea level readings were recorded. In India, tsunami warning sirens were reportedly sounded in the Andaman and Nicobar Islands. In areas such as Carbyn Junction, on the outskirts of Port Blair, the only warning available to residents came from television news stations. In the Nicobar Islands, residents fled to higher ground immediately after the earthquake fearing a tsunami. Coastal areas in Chennai were evacuated by local law enforcement agencies. However, many in the districts of Cuddalore, Kanyakumari and Nagapattinam remained unaware of the tsunami advisories until after day break later that same day. In Sri Lanka, people in the cities of Kalutara, Koralawela, Matara and Galle voluntarily headed inland and sough refuge in churches, temples and schools that were situated on higher ground. In Galle, intercity traffic was halted and some buses were redirected inland as a safety precaution. Villages were also evacuated in the Phangna province in Thailand.

This is the largest earthquake in the Nicobar Islands since a Mw=7.3 earthquake near Teressa Island on 24 July 2005 in this immediate region. A preliminary analysis of the focal mechanisms of both earthquakes might suggest the same fault system was involved in both events. At least nine significant aftershocks (M>4.5) were recorded in the 24-hours following the Mw=7.5 mainshock including four of M>5.0. The number of aftershocks diminish with time though the possibility of larger aftershocks should not be ruled out. This latest earthquake and the earthquake in July 2005 were both strike-slip in the type of faulting involved. This would explain the lack of a tsunami though it needs to be added that only a small percentage of earthquakes, regardless of type of faulting, produce appreciable tsunamis.

01) National Earthquake Information Centre (PDE), Golden, USA.
02) Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, India.
03) Harvard Centroid Moment Tensor Solution (HRV), Harvard, USA.
04) Macroseismic information has been compiled by the ASC from reports by local media and local NGO personnel

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Page Updated: 16 Jun 2010 | Website Disclaimer

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