Mild tremor was felt in the sea near Thiruvananthapuram city on Saturday evening.
Centre for Earthquake Studies (CES) director ruled out any chance for a tsunami after the 4.7 magnitude quake with epic centre in the sea, 300km away from capital city and 10km down from sea level.
This is the second consecutive day when the state reported mild tremors. Earlier on Friday the state recorded magnitude 2.8 and 3.2 tremors in Idukki district.
The quakes reportedly affected the over 100-year-old Mullaiperiyar Dam forcing Kerala Chief Minister Oommen Chandy to sent a team of officials led by Revenue Minister Thiruvanchoor Radhakrishanan for the inspection.
"I do not think there is cause of any worry, but it is being viewed seriously," said the CM.
Revenue Minister, who has the charge of Disaster Management, will be visiting the dam along with the officials and experts and would be submitting a report to the government, he said.