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While Tsunami waves can reach heights of 30 to 40 meters, 'Kallakadal' waves can reach a maximum height of 11 meters.
Japan's weather agency said several small tsunami waves reached parts of the southern prefecture of Okinawa.
Kerala State Disaster Management Authority assured that there is no need to panic.
The disaster left more than 30,000 people homeless and cut power to tens of thousands of residences and businesses.
Survival rates drop off 72 hours after the quake, according to emergency responders. Severed roads and the remote location of the worst-hit areas have complicated rescue efforts.
Around 200 tremors have been detected since the quake first hit on Monday, according to the Japan Meteorological Agency, which warned that more strong shocks could hit in the coming days.
Evacuation orders were issued for some areas in the Philippines and southwestern Japanese coasts because of warnings of tsunami waves of a metre (3 feet) or more.
Potential tsunami threats were issued for Vanuatu, Fiji and New Caledonia
There were no immediate reports of damages or injuries.
The quake of 6.8 magnitude hit the eastern province of North Maluku on Friday morning, but did not cause casualties or damages.