Tremors were felt in Chennai, Bangalore, Thiruvananthapuram and several other cities across south India following the 8.7 magnitude earthquake in Indonesia.
Areas near Marina Beach Road in Chennai have been alerted in the wake of several coastal regions of Tamil Nadu, Andhra Pradesh and Andaman and Nicobar Islands being put on alert, police said.
There were no immediate reports of damage to property or loss of lives.
In December 2004, killer Tsunami waves devastated several coastal areas of Tamil Nadu and hit Marina Beach here, causing heavy casualties.
In Kerala, people in Thiruvananthapuram and Kochi experienced slight tremors.
The country's IT capital Bangalore also experienced mild tremors, police said.
People rushed out of houses and high rise office buildings in panic in these cities.
Alert issued across Kerala
Thiruvananthapuram: Kerala government today issued an alert across the state, particularly for the coastal belt, as most parts of the state experienced mild tremor in in the wake of a massive earthquake in Indonesia triggering fears of a tsunami.
Chief Minister Oommen Chandy, however, said there was no need for panic though the alert was issued just for the people and the authorities to maintain vigil.
Going by the reports received by the government by agencies like IMD, possibility of a tsunami could not be totally ruled out and people had been asked to keep a watch over the situation, Chandy told reporters after a cabinet meeting.
Chandy said as per IMD repsort, even if the tsunami strikes it would not be as intense as the one that had hit the state in 2004. Fishermen had been asked not to venture into sea for another four hours, Chandy said.
