* Story Highlights
    * A magnitude-6.3 earthquake shakes the western coast of Sumatra
    * Warning cites small possibility of tsunami on coasts up to 62
miles from epicenter
    * Epicenter 175 miles south of Banda Aceh, site of Indian Ocean
tsunami of 2004.

(CNN) -- A magnitude-6.3 earthquake off the coast of Indonesia on Sunday
could trigger a tsunami on coasts near its epicenter, the Pacific
Tsunami Warning Center said.

The earthquake happened about 12:30 a.m. (1:30 p.m. Saturday ET) off the
western coast of the Indonesian island of Sumatra, according to the U.S.
Geological Survey.

Japan's Meteorological Agency may issue more information, the warning
center said.

The epicenter was about 175 miles (281 kilometers) south of Banda Aceh
-- in a region hard-hit by the Indian Ocean tsunami of 2004.

"A destructive, widespread tsunami threat does not exist based on
historical earthquake and tsunami data," said an information bulletin
issued by the tsunami warning center.

"However, there is a very small possibility of a local tsunami that
could affect coasts located usually no more than 100 kilometers (62
miles) from the earthquake epicenter," the bulletin said. "Authorities
in the region near the epicenter should be made aware of this possibility."

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