(Corrects to say quake occurred on Thursday, not Tuesday)

SINGAPORE, Oct 31 (Reuters) - An earthquake with a magnitude of 6.8 struck on Thursday 37 km (23 miles) west of the city of Davao, Philippines, at a depth of 22 km, the United States Geological Survey reported. (Reporting by Christian Schmollinger Editing by Shri Navaratnam)

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