JAKARTA, Sept 14 (Reuters) - Indonesia's meteorology agency issued a tsunami warning on Friday after another strong earthquake struck southern Sumatra island.

Sumatra has been hit by a series of powerful earthquakes since a magnitude 8.4 quake struck on Wednesday.

The agency said via a telephone text message the latest quake measured 6.9 on the Richter scale and was 153 km (95 miles) southwest of Lais Bengkulu. The epicentre was at a depth of 10 km (6 miles).

The U.S. Geological Survey said on its Web site the quake was 6.6 magnitude at a depth of 47 km.

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