The story

People on the Indonesian island of Sumatra were jolted Thursday by a powerful tremor that prompted the Indonesian government to issue another tsunami warning.

The quake came just 12 hours after Indonesia had been rocked by a deadly earthquake that killed at least nine people.

Residents in other Indian Ocean nations were also put on notice on Thursday about the possibility of tsunami waves. Most of those watches were later dropped, although a watch remained in effect for Australia. Read full article »

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All About Pacific Tsunami Warning Center • U.S. Geological Survey • Sumatra