The already battered Andaman and Nicobar Islands were shaken by temblors measuring between 5.1 and 6.1 on the Richter scale, the Press Trust of India reported.
At least 10,000 people on the islands remained unaccounted for Wednesday.
Facing fears of epidemics in those regions, the government deployed teams to provide inoculations and to assess the number of homeless.
In Tamil Nadu, where at least 7,000 were killed, hasty mass burials and cremations were arranged to prevent putrefied bodies from spreading disease, the agency reported.
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