Indonesia rocked by another quake

• Story Highlights
• NEW: Quake with a preliminary magnitude of 6.2 struck late Thursday
  
• 7.8-magnitude quake strikes at 1145 GMT Thursday, reports USGS
  
• 7.1-magnitude quake strikes four hours after, reports USGS
  
• Nine killed as 8.4 quake strikes off western Indonesian coast Wednesday
  
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