Magnitude 7.5 - NICOBAR ISLANDS, INDIA REGION
2010 June 12 19:26:50 UTC
- This event has been reviewed by a seismologist.
|Depth||35 km (21.7 miles) set by location program|
|Region||NICOBAR ISLANDS, INDIA REGION|
|Distances||155 km (95 miles) W of Mohean, Nicobar Islands, India|
430 km (270 miles) SSW of Port Blair, Andaman Islands, India
1140 km (710 miles) SW of BANGKOK, Thailand
2760 km (1720 miles) SE of NEW DELHI, Delhi, India
|Location Uncertainty||horizontal +/- 4.6 km (2.9 miles); depth fixed by location program|
|Parameters||NST=420, Nph=420, Dmin=627 km, Rmss=1.14 sec, Gp= 29°,|
M-type=teleseismic moment magnitude (Mw), Version=S
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Felt (VI) at Port Blair, (III) at Abiramam, Ambattur, Chennamalai, Chepet, Madippakkam, Madras, Saint Thomas Mount and Visakhapatnam; (II) at Bangalore, Calcutta, Kolathur, Porur and Valasaravakkam. Felt (IV) at Banda Aceh, Indonesia. Felt (III) at Colombo, Dehiwala-Mount Lavinia, Galla, Kandy; (II) at Battaramulla, Matara, Moratuwa, Sri Lanka. Felt (III) at Dacca, Bangladesh. Also felt at Dhamrai. Felt (II) at Male, Maldives. Felt in Singapore, at Perai, Malaysia and at Kathu, Thailand. Felt widely in countries bordering the Bay of Bengal.
The Nicobar Islands region earthquake of June 12, 2010 occurred as a result of oblique-reverse faulting in close proximity to the oceanic trench defining the bathymetric expression of the plate boundary between the Australia-India and Sunda plates. At the location of this earthquake, the Australia and India Plates move northwards with respect to the Sunda plate at a velocity of approximately 45-50 mm/yr. On the basis of the currently available fault mechanism information, earthquake location and depth, it is likely that this earthquake occurred within the Australia-India oceanic plate, rather than on the interplate thrust boundary.
Today's earthquake was located adjacent to the 1300 km long rupture area of the devastating Mw 9.1 earthquake of December 2004, approximately 650 km to the north west of the hypocenter of that event, in a region of the Australia-India plate that has experienced a broad variety of faulting mechanisms in the past.
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver