A magnitude 6.4 earthquake (search) shook the seabed southwest of Indonesia's Sumatra (search) island on Tuesday. There were no immediate reports of damage.

The U.S. Geological Survey said the quake occurred just after 8 a.m. local time, about 150 miles from the coastline at a depth of 19 miles.

The Indonesian Meteorology and Geophysics Agency said no damage or casualties had been reported.

Temblors have been a daily occurrence in the region since a monster 9.1 magnitude earthquake struck the region on Dec. 26 and triggered a tsunami, killing as many as 180,000 people in Indonesia (search) and 10 others countries across the Indian Ocean.