A strong earthquake with a preliminary magnitude of 6.2 struck late Thursday off the western coast of Sumatra, the same area shaken by a major 8.4-magnitude temblor that killed nine people Wednesday.
The region has been wracked by quakes and aftershocks for the past two days.
The most recent quake struck at 11:09 p.m. (12:09 p.m. ET), 110 kilometers (65 miles) west-northwest of Sumatra's Bengkulu province at a depth of only 3 km (2 miles), according to the U.S. Geological Survey. 
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CNN's Andy Saputra contributed to this report.
All About Sumatra • Pacific Tsunami Warning Center • Indonesia